From 8bdd3f8a6993fef2f364aca6e1a59559405773a2 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 1 Feb 2008 09:44:28 +0100 Subject: [PATCH] as-iosched: fix inconsistent ioc->lock context Since it's acquired from irq context, all locking must be of the irq safe variant. Most are already inside the queue lock (which already disables interrupts), but the io scheduler rmmod path always has irqs enabled and the put_io_context() path may legally be called with irqs enabled (even if it isn't usually). So fixup those two. Signed-off-by: Jens Axboe --- block/as-iosched.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/block/as-iosched.c b/block/as-iosched.c index 9603684..612d640 100644 --- a/block/as-iosched.c +++ b/block/as-iosched.c @@ -170,11 +170,11 @@ static void free_as_io_context(struct as_io_context *aic) static void as_trim(struct io_context *ioc) { - spin_lock(&ioc->lock); + spin_lock_irq(&ioc->lock); if (ioc->aic) free_as_io_context(ioc->aic); ioc->aic = NULL; - spin_unlock(&ioc->lock); + spin_unlock_irq(&ioc->lock); } /* Called when the task exits */ @@ -235,10 +235,12 @@ static void as_put_io_context(struct request *rq) aic = RQ_IOC(rq)->aic; if (rq_is_sync(rq) && aic) { - spin_lock(&aic->lock); + unsigned long flags; + + spin_lock_irqsave(&aic->lock, flags); set_bit(AS_TASK_IORUNNING, &aic->state); aic->last_end_request = jiffies; - spin_unlock(&aic->lock); + spin_unlock_irqrestore(&aic->lock, flags); } put_io_context(RQ_IOC(rq)); -- 1.8.2.3