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[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>
This commit is contained in:
Pat Gefre 2007-03-07 20:41:29 -08:00 committed by Linus Torvalds
parent 44f5c4ced6
commit f70c81d4dd
1 changed files with 17 additions and 35 deletions
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52
drivers/serial/sn_console.c
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@ -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;
if (port) {
DPRINTF("sn_console: switching to interrupt driven console\n");
DPRINTF("sn_console: switching to interrupt driven console\n");
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;
spin_lock_irqsave(&port->sc_port.lock, flags);
irq = sn_sal_connect_interrupt(port);
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);
}
/*