commit ac608e65f5c2a99affced5f02eefe24125f9c5bd
Author: Jeff Garzik
Date: Fri Oct 19 16:43:21 2007 -0400

drivers/char/{rio,specialix,sx}: irq handler cleanups

* explicitly separate polled and irq-driven modes of operation

* no need to reference 'irq' function arg

* mark a free_irq() -in-irq-handler use with a FIXME (ugh!)

Signed-off-by: Jeff Garzik

drivers/char/rio/rio_linux.c | 23 +++++++++++++----------
drivers/char/specialix.c | 10 ++++------
drivers/char/sx.c | 22 ++++++++++++++--------
3 files changed, 31 insertions(+), 24 deletions(-)

ac608e65f5c2a99affced5f02eefe24125f9c5bd
diff --git a/drivers/char/rio/rio_linux.c b/drivers/char/rio/rio_linux.c
index 0ce9667..fb06665 100644
--- a/drivers/char/rio/rio_linux.c
+++ b/drivers/char/rio/rio_linux.c
@@ -362,14 +362,11 @@ static void rio_reset_interrupt(struct Host *HostP)
func_exit();
}

-
-static irqreturn_t rio_interrupt(int irq, void *ptr)
+static irqreturn_t __rio_interrupt(struct Host *HostP, bool polled)
{
- struct Host *HostP;
func_enter();

- HostP = ptr; /* &p->RIOHosts[(long)ptr]; */
- rio_dprintk(RIO_DEBUG_IFLOW, "rio: enter rio_interrupt (%d/%d)\n", irq, HostP->Ivec);
+ rio_dprintk(RIO_DEBUG_IFLOW, "rio: enter rio_interrupt (%d)\n", HostP->Ivec);

/* AAargh! The order in which to do these things is essential and
not trivial.
@@ -389,7 +386,7 @@ static irqreturn_t rio_interrupt(int irq, void *ptr)
*/

rio_dprintk(RIO_DEBUG_IFLOW, "rio: We've have noticed the interrupt\n");
- if (HostP->Ivec == irq) {
+ if (!polled) {
/* Tell the card we've noticed the interrupt. */
rio_reset_interrupt(HostP);
}
@@ -398,26 +395,32 @@ static irqreturn_t rio_interrupt(int irq, void *ptr)
return IRQ_HANDLED;

if (test_and_set_bit(RIO_BOARD_INTR_LOCK, &HostP->locks)) {
- printk(KERN_ERR "Recursive interrupt! (host %p/irq%d)\n", ptr, HostP->Ivec);
+ printk(KERN_ERR "Recursive interrupt! (host %p/irq%d)\n",
+ HostP, HostP->Ivec);
return IRQ_HANDLED;
}

RIOServiceHost(p, HostP);

- rio_dprintk(RIO_DEBUG_IFLOW, "riointr() doing host %p type %d\n", ptr, HostP->Type);
+ rio_dprintk(RIO_DEBUG_IFLOW, "riointr() doing host %p type %d\n",
+ HostP, HostP->Type);

clear_bit(RIO_BOARD_INTR_LOCK, &HostP->locks);
- rio_dprintk(RIO_DEBUG_IFLOW, "rio: exit rio_interrupt (%d/%d)\n", irq, HostP->Ivec);
+ rio_dprintk(RIO_DEBUG_IFLOW, "rio: exit rio_interrupt (%d)\n", HostP->Ivec);
func_exit();
return IRQ_HANDLED;
}

+static irqreturn_t rio_interrupt(int dummy, void *ptr)
+{
+ return __rio_interrupt(ptr, false);
+}

static void rio_pollfunc(unsigned long data)
{
func_enter();

- rio_interrupt(0, &p->RIOHosts[data]);
+ __rio_interrupt(&p->RIOHosts[data], true);
mod_timer(&p->RIOHosts[data].timer, jiffies + rio_poll);

func_exit();
diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
index 4558556..706e74f 100644
--- a/drivers/char/specialix.c
+++ b/drivers/char/specialix.c
@@ -446,8 +446,7 @@ void missed_irq (unsigned long data)
spin_unlock_irqrestore(&bp->lock, flags);
if (irq) {
printk (KERN_INFO "Missed interrupt... Calling int from timer. \n");
- sx_interrupt (((struct specialix_board *)data)->irq,
- (void*)data);
+ sx_interrupt (-1, bp);
}
mod_timer(&missed_irq_timer, jiffies + sx_poll);
}
@@ -876,23 +875,22 @@ static inline void sx_check_modem(struct specialix_board * bp)


/* The main interrupt processing routine */
-static irqreturn_t sx_interrupt(int irq, void *dev_id)
+static irqreturn_t sx_interrupt(int dummy, void *dev_id)
{
unsigned char status;
unsigned char ack;
- struct specialix_board *bp;
+ struct specialix_board *bp = dev_id;
unsigned long loop = 0;
int saved_reg;
unsigned long flags;

func_enter();

- bp = dev_id;
spin_lock_irqsave(&bp->lock, flags);

dprintk (SX_DEBUG_FLOW, "enter %s port %d room: %ld\n", __FUNCTION__, port_No(sx_get_port(bp, "INT")), SERIAL_XMIT_SIZE - sx_get_port(bp, "ITN")->xmit_cnt - 1);
if (!(bp->flags & SX_BOARD_ACTIVE)) {
- dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", irq);
+ dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", bp->irq);
spin_unlock_irqrestore(&bp->lock, flags);
func_exit();
return IRQ_NONE;
diff --git a/drivers/char/sx.c b/drivers/char/sx.c
index a6e1c9b..ae9e973 100644
--- a/drivers/char/sx.c
+++ b/drivers/char/sx.c
@@ -1241,15 +1241,13 @@ static inline void sx_check_modem_signals(struct sx_port *port)
* Small, elegant, clear.
*/

-static irqreturn_t sx_interrupt(int irq, void *ptr)
+static irqreturn_t __sx_interrupt(struct sx_board *board, bool polled)
{
- struct sx_board *board = ptr;
struct sx_port *port;
int i;

func_enter();
- sx_dprintk(SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d/%d)\n", irq,
- board->irq);
+ sx_dprintk(SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d)\n", board->irq);

/* AAargh! The order in which to do these things is essential and
not trivial.
@@ -1281,6 +1279,10 @@ static irqreturn_t sx_interrupt(int irq, void *ptr)

if (lastjif == jiffies) {
if (++nintr > IRQ_RATE_LIMIT) {
+ /*
+ * FIXME: free_irq() inside irq handler
+ * is unwise
+ */
free_irq(board->irq, board);
printk(KERN_ERR "sx: Too many interrupts. "
"Turning off interrupt %d.\n",
@@ -1293,7 +1295,7 @@ static irqreturn_t sx_interrupt(int irq, void *ptr)
}
#endif

- if (board->irq == irq) {
+ if (!polled) {
/* Tell the card we've noticed the interrupt. */

sx_write_board_word(board, cc_int_pending, 0);
@@ -1339,19 +1341,23 @@ static irqreturn_t sx_interrupt(int irq, void *ptr)

clear_bit(SX_BOARD_INTR_LOCK, &board->locks);

- sx_dprintk(SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d/%d)\n", irq,
- board->irq);
+ sx_dprintk(SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d)\n", board->irq);
func_exit();
return IRQ_HANDLED;
}

+static irqreturn_t sx_interrupt(int dummy, void *data)
+{
+ return __sx_interrupt(data, false);
+}
+
static void sx_pollfunc(unsigned long data)
{
struct sx_board *board = (struct sx_board *)data;

func_enter();

- sx_interrupt(0, board);
+ __sx_interrupt(board, true);

mod_timer(&board->timer, jiffies + sx_poll);
func_exit();
-
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