Well, panic() is a little bit undue if request_irq() fails; there is
probably no need to justify it any further. Handle the case gracefully,
by unregistering the driver.

Signed-off-by: Maciej W. Rozycki
---
Tested with checkpatch.pl and at the run-time -- MIPS/Linux on a
DECstation 5000/200.

Please apply,

Maciej

patch-mips-2.6.18-20060920-dz-init-0
diff -up --recursive --new-file linux-mips-2.6.18-20060920.macro/drivers/serial/dz.c linux-mips-2.6.18-20060920/drivers/serial/dz.c
--- linux-mips-2.6.18-20060920.macro/drivers/serial/dz.c 2006-11-23 05:17:01.000000000 +0000
+++ linux-mips-2.6.18-20060920/drivers/serial/dz.c 2007-01-14 00:39:20.000000000 +0000
@@ -795,18 +795,28 @@ static int __init dz_init(void)
dz_reset(&dz_ports[0]);
#endif

- if (request_irq(dz_ports[0].port.irq, dz_interrupt,
- IRQF_DISABLED, "DZ", &dz_ports[0]))
- panic("Unable to register DZ interrupt");
-
ret = uart_register_driver(&dz_reg);
if (ret != 0)
- return ret;
+ goto out;
+
+ ret = request_irq(dz_ports[0].port.irq, dz_interrupt, IRQF_DISABLED,
+ "DZ", &dz_ports[0]);
+ if (ret != 0) {
+ printk(KERN_ERR "dz: Cannot get IRQ %d!\n",
+ dz_ports[0].port.irq);
+ goto out_unregister;
+ }

for (i = 0; i < DZ_NB_PORT; i++)
uart_add_one_port(&dz_reg, &dz_ports[i].port);

return ret;
+
+out_unregister:
+ uart_unregister_driver(&dz_reg);
+
+out:
+ return ret;
}

module_init(dz_init);
-
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