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authorJens Axboe <jens.axboe@oracle.com>2008-02-01 03:44:28 -0500
committerJens Axboe <jens.axboe@oracle.com>2008-02-01 03:44:28 -0500
commit8bdd3f8a6993fef2f364aca6e1a59559405773a2 (patch)
treecbf07985c3396417932002be5cd5e4f2c47433e9 /block/as-iosched.c
parent4f4f6c2502474f51654a699d7127d86c2f87075a (diff)
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 <jens.axboe@oracle.com>
Diffstat (limited to 'block/as-iosched.c')
-rw-r--r--block/as-iosched.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 96036846a001..612d64096300 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)
170 170
171static void as_trim(struct io_context *ioc) 171static void as_trim(struct io_context *ioc)
172{ 172{
173 spin_lock(&ioc->lock); 173 spin_lock_irq(&ioc->lock);
174 if (ioc->aic) 174 if (ioc->aic)
175 free_as_io_context(ioc->aic); 175 free_as_io_context(ioc->aic);
176 ioc->aic = NULL; 176 ioc->aic = NULL;
177 spin_unlock(&ioc->lock); 177 spin_unlock_irq(&ioc->lock);
178} 178}
179 179
180/* Called when the task exits */ 180/* Called when the task exits */
@@ -235,10 +235,12 @@ static void as_put_io_context(struct request *rq)
235 aic = RQ_IOC(rq)->aic; 235 aic = RQ_IOC(rq)->aic;
236 236
237 if (rq_is_sync(rq) && aic) { 237 if (rq_is_sync(rq) && aic) {
238 spin_lock(&aic->lock); 238 unsigned long flags;
239
240 spin_lock_irqsave(&aic->lock, flags);
239 set_bit(AS_TASK_IORUNNING, &aic->state); 241 set_bit(AS_TASK_IORUNNING, &aic->state);
240 aic->last_end_request = jiffies; 242 aic->last_end_request = jiffies;
241 spin_unlock(&aic->lock); 243 spin_unlock_irqrestore(&aic->lock, flags);
242 } 244 }
243 245
244 put_io_context(RQ_IOC(rq)); 246 put_io_context(RQ_IOC(rq));