[PATCH] 2.6 Altix: console fix for CONFIG_DEBUG_SHIRQ usage

The sn console driver was snagged by the use of CONFIG_DEBUG_SHIRQ!

The request_irq() immediate call to the interrupt handler caused
another attempt to lock the port lock - deadlock.

This is a patch to fix that.

Signed-off-by: Patrick Gefre <pfg@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/serial/sn_console.c b/drivers/serial/sn_console.c
index 253ceb895ca7bcf9a10b77b50e0493044aa30a32..a27e9e92cb5eed49811fe974ec50b3939ba39f53 100644 (file)
--- a/drivers/serial/sn_console.c
+++ b/drivers/serial/sn_console.c
@@ -635,25 +635,6 @@ static irqreturn_t sn_sal_interrupt(int irq, void *dev_id)
        return IRQ_HANDLED;
 }
 
-/**
- * sn_sal_connect_interrupt - Request interrupt, handled by sn_sal_interrupt
- * @port: Our sn_cons_port (which contains the uart port)
- *
- * returns the console irq if interrupt is successfully registered, else 0
- *
- */
-static int sn_sal_connect_interrupt(struct sn_cons_port *port)
-{
-       if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt,
-                       IRQF_DISABLED | IRQF_SHARED,
-                       "SAL console driver", port) >= 0) {
-               return SGI_UART_VECTOR;
-       }
-
-       printk(KERN_INFO "sn_console: console proceeding in polled mode\n");
-       return 0;
-}
-
 /**
  * sn_sal_timer_poll - this function handles polled console mode
  * @data: A pointer to our sn_cons_port (which contains the uart port)
@@ -746,30 +727,31 @@ static void __init sn_sal_switch_to_asynch(struct sn_cons_port *port)
  * mode.  We were previously in asynch/polling mode (using init_timer).
  *
  * We attempt to switch to interrupt mode here by calling
- * sn_sal_connect_interrupt.  If that works out, we enable receive interrupts.
+ * request_irq.  If that works out, we enable receive interrupts.
  */
 static void __init sn_sal_switch_to_interrupts(struct sn_cons_port *port)
 {
-       int irq;
        unsigned long flags;
 
-       if (!port)
-               return;
-
-       DPRINTF("sn_console: switching to interrupt driven console\n");
-
-       spin_lock_irqsave(&port->sc_port.lock, flags);
+       if (port) {
+               DPRINTF("sn_console: switching to interrupt driven console\n");
 
-       irq = sn_sal_connect_interrupt(port);
+               if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt,
+                               IRQF_DISABLED | IRQF_SHARED,
+                               "SAL console driver", port) >= 0) {
+                       spin_lock_irqsave(&port->sc_port.lock, flags);
+                       port->sc_port.irq = SGI_UART_VECTOR;
+                       port->sc_ops = &intr_ops;
 
-       if (irq) {
-               port->sc_port.irq = irq;
-               port->sc_ops = &intr_ops;
-
-               /* turn on receive interrupts */
-               ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV);
+                       /* turn on receive interrupts */
+                       ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV);
+                       spin_unlock_irqrestore(&port->sc_port.lock, flags);
+               }
+               else {
+                       printk(KERN_INFO
+                           "sn_console: console proceeding in polled mode\n");
+               }
        }
-       spin_unlock_irqrestore(&port->sc_port.lock, flags);
 }
 
 /*