Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G. - Kernel

This is a discussion on Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G. - Kernel ; Kuan Luo wrote: > hi robert, > I have fixed a bug in rhel4u5 2.6.9-55 when running adma mode > with HDS7250SASUN500G. > Could you check this code and if no problem, then help me to > submit to the ...

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Thread: Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

  1. Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Kuan Luo wrote:
    > hi robert,
    > I have fixed a bug in rhel4u5 2.6.9-55 when running adma mode
    > with HDS7250SASUN500G.
    > Could you check this code and if no problem, then help me to
    > submit to the newest kernel.
    >


    What problem does this resolve? I tested it against the cache flush/NCQ
    write switching problem we've been trying to solve, and it doesn't look
    like it fixes that one - if I apply this patch and then remove the
    udelay(20) in sata_nv.c that I added which prevented me from seeing this
    problem before, it shows up.

    If you want to try and reproduce that problem, you can take out this
    udelay(20) from the current version:

    if (curr_ncq != pp->last_issue_ncq) {
    /* Seems to need some delay before switching between NCQ and
    non-NCQ commands, else we get command timeouts and such. */
    udelay(20);
    pp->last_issue_ncq = curr_ncq;
    }

    then run 2 instances of this C program, with different output files as
    the argument:

    #include
    #include
    #include
    #include
    #include
    #include

    int main(int argc, char* argv[])
    {
    int i;
    int fd = open( argv[1], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
    if(fd == -1)
    {
    perror("open");
    return 1;
    }
    for(i=0;i<1000000;i++)
    {
    int rc = write(fd, "0", 1);
    if( rc != 1 )
    {
    perror("write");
    return 2;
    }
    rc = fsync(fd);
    if(rc)
    {
    perror("fsync");
    return 2;
    }
    }
    return 0;
    }

    and one instance of this:

    dd if=/dev/zero of=blankfile bs=512 count=100000 oflag=direct

    and one of this:

    while /bin/true; do sdparm --command=sync /dev/sdb; done

    all at the same time. In my experience, it helps to disable cpufreq (on
    Red Hat/Fedora, /sbin/service cpuspeed stop) to force the CPU to run at
    max frequency all the time. After a few minutes I got this:

    ata4: EH in ADMA mode, notifier 0x0 notifier_error 0x0 gen_ctl 0x1501000
    status 0x400 next cpb count 0x2 next cpb idx 0x0
    ata4: CPB 0: ctl_flags 0x1f, resp_flags 0x0
    ata4: CPB 1: ctl_flags 0x1f, resp_flags 0x0
    ata4: CPB 2: ctl_flags 0x1f, resp_flags 0x0
    ata4: timeout waiting for ADMA IDLE, stat=0x400
    ata4: timeout waiting for ADMA LEGACY, stat=0x400
    ata4.00: exception Emask 0x0 SAct 0x7 SErr 0x0 action 0x2 frozen
    ata4.00: cmd 61/08:00:e0:74:64/00:00:0a:00:00/40 tag 0 ncq 4096 out
    res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
    ata4.00: status: { DRDY }
    ata4.00: cmd 61/08:08:30:5b:76/00:00:0c:00:00/40 tag 1 ncq 4096 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    ata4.00: status: { DRDY }
    ata4.00: cmd 61/01:10:ba:51:77/00:00:0c:00:00/40 tag 2 ncq 512 out
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    ata4.00: status: { DRDY }
    ata4: soft resetting link
    ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    ata4.00: configured for UDMA/133
    ata4: EH complete
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  2. RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Robert han**** wrote:
    > What problem does this resolve? I tested it against the cache
    > flush/NCQ
    > write switching problem we've been trying to solve, and it
    > doesn't look
    > like it fixes that one - if I apply this patch and then remove the
    > udelay(20) in sata_nv.c that I added which prevented me from
    > seeing this
    > problem before, it shows up.
    >


    First thank davide to help to send the attachment.

    Robert,
    The patch is to solve the error message "ata1: CPB flags CMD err,
    flags=0x11" when testing HDS7250SASUN500G in rhel4u5.
    I tested this hd in 2.6.24-rc7 which needed to remove the mask in
    blacklist to run the ncq and the same error also showed up.

    I traced the bug and found that the interrupt finished a command (for
    example, tag=0) when the driver got that adma status is
    NV_ADMA_STAT_DONE and cpb->resp_flags is NV_CPB_RESP_DONE.
    However, For this hd, the drive maybe didn't clear bit 0 at this moment.
    It meaned the hardware had not completely finished the command.
    If at the same time the driver freed the command(tag 0) and sended
    another command (tag 0), the error happened.

    The notifier register is 32-bit register containing notifier value.
    Value is bit vector containing one bit per tag number (0-31) in
    corresponding bit positions (bit 0 is for tag 0, etc). When bit is set
    then ADMA indicates that command with corresponding tag number completed
    execution.

    So i added the check notifier code. Sometimes i saw that the notifier
    reg set some bits , but the adma status set NV_ADMA_STAT_CMD_COMPLETE
    ,not NV_ADMA_STAT_DONE. So i added the NV_ADMA_STAT_CMD_COMPLETE check
    code.



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  3. RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Robert Han**** wrote:
    > As I mentioned, this doesn't seem to resolve the problem we're seeing
    > with rapidly intermixed NCQ commands and cache flushes (at
    > least, if I
    > take out the arbitrary 20usec delay from the driver and add
    > this patch,
    > the problem still shows up). It could be a similar problem,
    > though, of
    > commands being issued before the controller is really ready
    > for them. If
    > you or others at NVIDIA could assist in tracking down that problem it
    > would be appreciated..
    >

    Ok , i will track down that problem.
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  4. Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Kuan Luo wrote:
    > Robert han**** wrote:
    >> What problem does this resolve? I tested it against the cache
    >> flush/NCQ
    >> write switching problem we've been trying to solve, and it
    >> doesn't look
    >> like it fixes that one - if I apply this patch and then remove the
    >> udelay(20) in sata_nv.c that I added which prevented me from
    >> seeing this
    >> problem before, it shows up.
    >>

    >
    > First thank davide to help to send the attachment.
    >
    > Robert,
    > The patch is to solve the error message "ata1: CPB flags CMD err,
    > flags=0x11" when testing HDS7250SASUN500G in rhel4u5.
    > I tested this hd in 2.6.24-rc7 which needed to remove the mask in
    > blacklist to run the ncq and the same error also showed up.
    >
    > I traced the bug and found that the interrupt finished a command (for
    > example, tag=0) when the driver got that adma status is
    > NV_ADMA_STAT_DONE and cpb->resp_flags is NV_CPB_RESP_DONE.
    > However, For this hd, the drive maybe didn't clear bit 0 at this moment.
    > It meaned the hardware had not completely finished the command.
    > If at the same time the driver freed the command(tag 0) and sended
    > another command (tag 0), the error happened.
    >
    > The notifier register is 32-bit register containing notifier value.
    > Value is bit vector containing one bit per tag number (0-31) in
    > corresponding bit positions (bit 0 is for tag 0, etc). When bit is set
    > then ADMA indicates that command with corresponding tag number completed
    > execution.
    >
    > So i added the check notifier code. Sometimes i saw that the notifier
    > reg set some bits , but the adma status set NV_ADMA_STAT_CMD_COMPLETE
    > ,not NV_ADMA_STAT_DONE. So i added the NV_ADMA_STAT_CMD_COMPLETE check
    > code.


    That looks like a good fix then. (Though a possible optimization would
    be to and the check_commands value with the notifier clear value rather
    than testing against the notifier on each loop. That's fairly minor though.)

    As I mentioned, this doesn't seem to resolve the problem we're seeing
    with rapidly intermixed NCQ commands and cache flushes (at least, if I
    take out the arbitrary 20usec delay from the driver and add this patch,
    the problem still shows up). It could be a similar problem, though, of
    commands being issued before the controller is really ready for them. If
    you or others at NVIDIA could assist in tracking down that problem it
    would be appreciated..
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  5. sata_nv and 2.6.24 (was Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.)

    Robert Han**** wrote:
    > Kuan Luo wrote:
    >> Robert han**** wrote:
    >>> What problem does this resolve? I tested it against the cache
    >>> flush/NCQ write switching problem we've been trying to solve, and it
    >>> doesn't look like it fixes that one - if I apply this patch and then
    >>> remove the udelay(20) in sata_nv.c that I added which prevented me
    >>> from seeing this problem before, it shows up.
    >>>

    >>
    >> First thank davide to help to send the attachment.
    >>
    >> Robert,
    >> The patch is to solve the error message "ata1: CPB flags CMD err,
    >> flags=0x11" when testing HDS7250SASUN500G in rhel4u5.
    >> I tested this hd in 2.6.24-rc7 which needed to remove the mask in
    >> blacklist to run the ncq and the same error also showed up.
    >> I traced the bug and found that the interrupt finished a command (for
    >> example, tag=0) when the driver got that adma status is
    >> NV_ADMA_STAT_DONE and cpb->resp_flags is NV_CPB_RESP_DONE.
    >> However, For this hd, the drive maybe didn't clear bit 0 at this moment.
    >> It meaned the hardware had not completely finished the command.
    >> If at the same time the driver freed the command(tag 0) and sended
    >> another command (tag 0), the error happened.
    >>
    >> The notifier register is 32-bit register containing notifier value.
    >> Value is bit vector containing one bit per tag number (0-31) in
    >> corresponding bit positions (bit 0 is for tag 0, etc). When bit is set
    >> then ADMA indicates that command with corresponding tag number completed
    >> execution.
    >>
    >> So i added the check notifier code. Sometimes i saw that the notifier
    >> reg set some bits , but the adma status set NV_ADMA_STAT_CMD_COMPLETE
    >> ,not NV_ADMA_STAT_DONE. So i added the NV_ADMA_STAT_CMD_COMPLETE check
    >> code.

    >
    > That looks like a good fix then. (Though a possible optimization would
    > be to and the check_commands value with the notifier clear value rather
    > than testing against the notifier on each loop. That's fairly minor
    > though.)
    >
    > As I mentioned, this doesn't seem to resolve the problem we're seeing
    > with rapidly intermixed NCQ commands and cache flushes (at least, if I
    > take out the arbitrary 20usec delay from the driver and add this patch,
    > the problem still shows up). It could be a similar problem, though, of
    > commands being issued before the controller is really ready for them. If
    > you or others at NVIDIA could assist in tracking down that problem it
    > would be appreciated..


    Ping... sata_nv status is still a bit open for 2.6.24, and I would like
    to move us forward a bit.

    * Kuan's patch... it has been confirmed (and is needed), correct? can
    someone work up a good patch for 2.6.24? The only one I ever received
    was badly word-wrapped, and at the time, Robert seemed uncertain of it,
    so I waited.

    * ADMA ATAPI 4GB issues... playing tricks with the ordering of
    allocations and DMA masks is just way too fragile. We just cannot
    guarantee that all allocators work that way. The obvious solution to me
    seems to be hardcoding the consistent DMA mask to 32-bit, but using
    64-bit for regular dma mask if-and-only-if ADMA is enabled.

    * it sure seems like there are other open sata_nv ADMA issues -- can we
    hard-confirm or deny this? bugzilla wasn't very helpful for me. It
    doesn't seem like we can disable ADMA (to solve those issues) and get
    enough test time in (which is what I said a week (or more?) ago too...)

    It seems like we should be able to tackle the first two issues promptly,
    at least.

    Jeff



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  6. Re: sata_nv and 2.6.24 (was Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.)

    Jeff Garzik wrote:
    > Ping... sata_nv status is still a bit open for 2.6.24, and I would like
    > to move us forward a bit.
    >
    > * Kuan's patch... it has been confirmed (and is needed), correct? can
    > someone work up a good patch for 2.6.24? The only one I ever received
    > was badly word-wrapped, and at the time, Robert seemed uncertain of it,
    > so I waited.


    I can get you one later today hopefully.

    >
    > * ADMA ATAPI 4GB issues... playing tricks with the ordering of
    > allocations and DMA masks is just way too fragile. We just cannot
    > guarantee that all allocators work that way. The obvious solution to me
    > seems to be hardcoding the consistent DMA mask to 32-bit, but using
    > 64-bit for regular dma mask if-and-only-if ADMA is enabled.


    That's not enough to fix the problem since there's issues with actual
    transfer data being allocated above 4GB as well, not just the consistent
    allocations (it appears that blk_queue_bounce_limit setting to 32-bit
    doesn't prevent this on x86_64). Either we play some funky games with
    changing the DMA mask of the entire device to 32-bit if either port is
    in ATAPI mode (which blew up when I tried it) or we add the ability to
    set the DMA mask independently on each port (like by setting the mask on
    the SCSI device and using that for DMA mapping instead) which requires
    core changes.

    >
    > * it sure seems like there are other open sata_nv ADMA issues -- can we
    > hard-confirm or deny this? bugzilla wasn't very helpful for me. It
    > doesn't seem like we can disable ADMA (to solve those issues) and get
    > enough test time in (which is what I said a week (or more?) ago too...)


    The NCQ/non-NCQ command switching issue is still hitting some people
    (last I heard Kuan was looking into this), also there's a hotplug issue
    that Tejun reported..

    >
    > It seems like we should be able to tackle the first two issues promptly,
    > at least.
    >
    > Jeff
    >
    >
    >
    >

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  7. Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Kuan Luo wrote:
    > First thank davide to help to send the attachment.
    >
    > Robert,
    > The patch is to solve the error message "ata1: CPB flags CMD err,
    > flags=0x11" when testing HDS7250SASUN500G in rhel4u5.
    > I tested this hd in 2.6.24-rc7 which needed to remove the mask in
    > blacklist to run the ncq and the same error also showed up.
    >
    > I traced the bug and found that the interrupt finished a command (for
    > example, tag=0) when the driver got that adma status is
    > NV_ADMA_STAT_DONE and cpb->resp_flags is NV_CPB_RESP_DONE.
    > However, For this hd, the drive maybe didn't clear bit 0 at this moment.
    > It meaned the hardware had not completely finished the command.
    > If at the same time the driver freed the command(tag 0) and sended
    > another command (tag 0), the error happened.
    >
    > The notifier register is 32-bit register containing notifier value.
    > Value is bit vector containing one bit per tag number (0-31) in
    > corresponding bit positions (bit 0 is for tag 0, etc). When bit is set
    > then ADMA indicates that command with corresponding tag number completed
    > execution.
    >
    > So i added the check notifier code. Sometimes i saw that the notifier
    > reg set some bits , but the adma status set NV_ADMA_STAT_CMD_COMPLETE
    > ,not NV_ADMA_STAT_DONE. So i added the NV_ADMA_STAT_CMD_COMPLETE check
    > code.


    Kuan, does this patch (using the notifiers to see if the command is
    really done) still work if one port on the controller has ADMA disabled
    because it's in ATAPI mode? I seem to recall Allen Martin mentioning
    that notifiers wouldn't work in this case.
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  8. Re: sata_nv and 2.6.24 (was Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.)

    Jeff Garzik wrote:
    > Robert Han**** wrote:
    >> Jeff Garzik wrote:
    >>> Ping... sata_nv status is still a bit open for 2.6.24, and I would
    >>> like to move us forward a bit.
    >>>
    >>> * Kuan's patch... it has been confirmed (and is needed), correct?
    >>> can someone work up a good patch for 2.6.24? The only one I ever
    >>> received was badly word-wrapped, and at the time, Robert seemed
    >>> uncertain of it, so I waited.

    >>
    >> I can get you one later today hopefully.


    A question came up on this patch, whether it will cause problems with
    ATAPI mode - waiting for a response from the NVIDIA guys.

    >>
    >>>
    >>> * ADMA ATAPI 4GB issues... playing tricks with the ordering of
    >>> allocations and DMA masks is just way too fragile. We just cannot
    >>> guarantee that all allocators work that way. The obvious solution to
    >>> me seems to be hardcoding the consistent DMA mask to 32-bit, but
    >>> using 64-bit for regular dma mask if-and-only-if ADMA is enabled.

    >>
    >> That's not enough to fix the problem since there's issues with actual
    >> transfer data being allocated above 4GB as well, not just the
    >> consistent allocations (it appears that blk_queue_bounce_limit
    >> setting to 32-bit doesn't prevent this on x86_64). Either we play some
    >> funky games with changing the DMA mask of the entire device to 32-bit
    >> if either port is in ATAPI mode (which blew up when I tried it) or we
    >> add the ability to set the DMA mask independently on each port (like
    >> by setting the mask on the SCSI device and using that for DMA mapping
    >> instead) which requires core changes.

    >
    > Its all funky games that no other driver is doing... There is one
    > guaranteed to work scenario -- set all masks and bounce limits etc. to
    > 32-bit. There is also one highly-likely-to-work scenario, disabling
    > ADMA by default.


    Sure, if you don't mind a potentially significant performance
    regression. All the DMA mask problems are due to the fact that the mask
    settings for both ports are ganged together on the PCI device. If we
    could set the DMA masks on the SCSI device or something else that was
    port-specific, and do the command DMA mapping against that device, then
    most of the wierdness goes away.

    It does seem like we're starting to get a bit of NVIDIA interest in
    looking into ADMA issues, which is definitely welcome.

    >
    >
    >>> * it sure seems like there are other open sata_nv ADMA issues -- can
    >>> we hard-confirm or deny this? bugzilla wasn't very helpful for me.
    >>> It doesn't seem like we can disable ADMA (to solve those issues) and
    >>> get enough test time in (which is what I said a week (or more?) ago
    >>> too...)

    >>
    >> The NCQ/non-NCQ command switching issue is still hitting some people
    >> (last I heard Kuan was looking into this), also there's a hotplug
    >> issue that Tejun reported..

    >
    > The former implies we need to disable swncq for 2.6.24, if it's not
    > stable yet.


    Huh? Nothing to do with SWNCQ, which last I checked was still off by
    default.
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  9. Re: sata_nv and 2.6.24 (was Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.)

    Robert Han**** wrote:
    > Jeff Garzik wrote:
    >> Ping... sata_nv status is still a bit open for 2.6.24, and I would
    >> like to move us forward a bit.
    >>
    >> * Kuan's patch... it has been confirmed (and is needed), correct?
    >> can someone work up a good patch for 2.6.24? The only one I ever
    >> received was badly word-wrapped, and at the time, Robert seemed
    >> uncertain of it, so I waited.

    >
    > I can get you one later today hopefully.
    >
    >>
    >> * ADMA ATAPI 4GB issues... playing tricks with the ordering of
    >> allocations and DMA masks is just way too fragile. We just cannot
    >> guarantee that all allocators work that way. The obvious solution to
    >> me seems to be hardcoding the consistent DMA mask to 32-bit, but using
    >> 64-bit for regular dma mask if-and-only-if ADMA is enabled.

    >
    > That's not enough to fix the problem since there's issues with actual
    > transfer data being allocated above 4GB as well, not just the consistent
    > allocations (it appears that blk_queue_bounce_limit setting to 32-bit
    > doesn't prevent this on x86_64). Either we play some funky games with
    > changing the DMA mask of the entire device to 32-bit if either port is
    > in ATAPI mode (which blew up when I tried it) or we add the ability to
    > set the DMA mask independently on each port (like by setting the mask on
    > the SCSI device and using that for DMA mapping instead) which requires
    > core changes.


    Its all funky games that no other driver is doing... There is one
    guaranteed to work scenario -- set all masks and bounce limits etc. to
    32-bit. There is also one highly-likely-to-work scenario, disabling
    ADMA by default.


    >> * it sure seems like there are other open sata_nv ADMA issues -- can
    >> we hard-confirm or deny this? bugzilla wasn't very helpful for me.
    >> It doesn't seem like we can disable ADMA (to solve those issues) and
    >> get enough test time in (which is what I said a week (or more?) ago
    >> too...)

    >
    > The NCQ/non-NCQ command switching issue is still hitting some people
    > (last I heard Kuan was looking into this), also there's a hotplug issue
    > that Tejun reported..


    The former implies we need to disable swncq for 2.6.24, if it's not
    stable yet.

    Jeff


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  10. RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Robert worte.
    >
    > Kuan, does this patch (using the notifiers to see if the command is
    > really done) still work if one port on the controller has
    > ADMA disabled
    > because it's in ATAPI mode? I seem to recall Allen Martin mentioning
    > that notifiers wouldn't work in this case.
    >


    I just tried the 2.6.24-rc7 sata_nv driver with one hd and one cdrom in
    the same controller.
    I mkfs hd and mounted the cdrom and no error happened.

    Allen, is there anything about notifier that we should pay attention
    to?

    >
    > >
    > > * it sure seems like there are other open sata_nv ADMA

    > issues -- can we
    > > hard-confirm or deny this? bugzilla wasn't very helpful

    > for me. It
    > > doesn't seem like we can disable ADMA (to solve those

    > issues) and get
    > > enough test time in (which is what I said a week (or more?)

    > ago too...)
    >
    > The NCQ/non-NCQ command switching issue is still hitting some people
    > (last I heard Kuan was looking into this), also there's a
    > hotplug issue
    > that Tejun reported..
    >

    I have not yet reproduced the switching issue even if i removed the
    udelay function according to your metholds.
    I tried the 2.6.24-rc7.
    I don't know what kernel version can easily reproduce the issue or
    mabye i omit some steps during test.

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  11. Re: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Kuan Luo wrote:
    > Robert worte.
    >> Kuan, does this patch (using the notifiers to see if the command is
    >> really done) still work if one port on the controller has
    >> ADMA disabled
    >> because it's in ATAPI mode? I seem to recall Allen Martin mentioning
    >> that notifiers wouldn't work in this case.
    >>

    >
    > I just tried the 2.6.24-rc7 sata_nv driver with one hd and one cdrom in
    > the same controller.
    > I mkfs hd and mounted the cdrom and no error happened.
    >
    > Allen, is there anything about notifier that we should pay attention
    > to?


    Assuming not, then this patch should be applied..

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  12. RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    robert wrote:
    > Kuan Luo wrote:
    > > Robert worte.
    > >> Kuan, does this patch (using the notifiers to see if the

    > command is
    > >> really done) still work if one port on the controller has
    > >> ADMA disabled
    > >> because it's in ATAPI mode? I seem to recall Allen Martin

    > mentioning
    > >> that notifiers wouldn't work in this case.
    > >>

    > >
    > > I just tried the 2.6.24-rc7 sata_nv driver with one hd and

    > one cdrom in
    > > the same controller.
    > > I mkfs hd and mounted the cdrom and no error happened.
    > >
    > > Allen, is there anything about notifier that we should pay

    > attention
    > > to?

    >
    > Assuming not, then this patch should be applied..
    >
    >


    I am asking someone about the issue.
    Soon i will be getting a concrete response.
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  13. RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

    Robert wrote:
    > Kuan Luo wrote:
    > > Robert worte.
    > >> Kuan, does this patch (using the notifiers to see if the

    > command is
    > >> really done) still work if one port on the controller has
    > >> ADMA disabled
    > >> because it's in ATAPI mode? I seem to recall Allen Martin

    > mentioning
    > >> that notifiers wouldn't work in this case.
    > >>

    > >
    > > I just tried the 2.6.24-rc7 sata_nv driver with one hd and

    > one cdrom in
    > > the same controller.
    > > I mkfs hd and mounted the cdrom and no error happened.
    > >
    > > Allen, is there anything about notifier that we should pay

    > attention
    > > to?

    >
    > Assuming not, then this patch should be applied..
    >
    >


    The patch should be applied.
    We use the notifier register and there is nothing to do with our
    notifier register in atapi mode.

    Allen wrote:
    I think that's one of the cases where memory notifiers don't work (one
    of the drives is not in ADMA mode either because it's ATAPI or it's in
    legacy mode). There's no issue with the notifier registers though.
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