Messages in this thread Patch in this message | | | From | Dmitry Torokhov <> | Subject | Re: [2.6 RFC/PATCH] Input: possible deadlock in i8042 | Date | Mon, 1 Dec 2003 01:59:30 -0500 |
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ChangeSet@1.1513, 2003-11-30 23:38:00-05:00, dtor_core@ameritech.net Input: Unregister port not only when there us no free IRQ available but also when write to control register failed. Use serio_unregister_port_delayed in i8042_open to avoid deadlock on serio_sem. Also logging moved a bit
i8042.c | 22 +++++++++++++++------- 1 files changed, 15 insertions(+), 7 deletions(-)
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diff -Nru a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c --- a/drivers/input/serio/i8042.c Mon Dec 1 01:15:56 2003 +++ b/drivers/input/serio/i8042.c Mon Dec 1 01:15:56 2003 @@ -231,21 +231,29 @@ if (request_irq(values->irq, i8042_interrupt, SA_SHIRQ, "i8042", i8042_request_irq_cookie)) { printk(KERN_ERR "i8042.c: Can't get irq %d for %s, unregistering the port.\n", values->irq, values->name); - values->exists = 0; - serio_unregister_port(port); - return -1; + goto irq_fail; } i8042_ctr |= values->irqen; if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) { - printk(KERN_ERR "i8042.c: Can't write CTR while opening %s.\n", values->name); - return -1; + printk(KERN_ERR "i8042.c: Can't write CTR while opening %s, unregistering the port\n", values->name); + goto ctr_fail; } i8042_interrupt(0, NULL, NULL); return 0; + +ctr_fail: + i8042_ctr &= ~values->irqen; + free_irq(values->irq, i8042_request_irq_cookie); + +irq_fail: + values->exists = 0; + serio_unregister_port_delayed(port); + + return -1; } /* @@ -691,13 +699,13 @@ return -1; } - serio_register_port(port); - printk(KERN_INFO "serio: i8042 %s port at %#lx,%#lx irq %d\n", values->name, (unsigned long) I8042_DATA_REG, (unsigned long) I8042_COMMAND_REG, values->irq); + + serio_register_port(port); return 0; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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