dz: don't panic() when request_irq() fails

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 <macro@linux-mips.org>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 5 deletions

diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c
index e1a2e413eb7..fb6f2730293 100644
--- a/drivers/serial/dz.c
+++ b/drivers/serial/dz.c
@@ -794,18 +794,28 @@ 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);