diff options
| author | Pat Gefre <pfg@sgi.com> | 2007-03-07 20:41:29 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-08 07:39:15 -0800 |
| commit | f70c81d4ddb0d300abc252cb594198d3c797a5e1 (patch) | |
| tree | 925163edba9bf56eb0875de46405632e8caea671 | |
| parent | 44f5c4ced6ddee2f5f2e45fa45b93370245d85bd (diff) | |
| download | linux-f70c81d4ddb0d300abc252cb594198d3c797a5e1.tar.bz2 | |
[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>
| -rw-r--r-- | drivers/serial/sn_console.c | 52 |
1 files changed, 17 insertions, 35 deletions
diff --git a/drivers/serial/sn_console.c b/drivers/serial/sn_console.c index 253ceb895ca7..a27e9e92cb5e 100644 --- a/drivers/serial/sn_console.c +++ b/drivers/serial/sn_console.c @@ -636,25 +636,6 @@ static irqreturn_t sn_sal_interrupt(int irq, void *dev_id) } /** - * 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); } /* |