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authorJens Axboe <jens.axboe@oracle.com>2009-02-02 08:42:32 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-02-02 08:42:32 +0100
commitfb8ec18c316d869271137c97320dbfd2def56569 (patch)
tree8cf6a84747e10f0cf78a1cb73b1ea69681da0d70
parent45c82b5a770be66845687a7d027c8b52946d59af (diff)
block: fix oops in blk_queue_io_stat()
Some initial probe requests don't have disk->queue mapped yet, so we can't rely on a non-NULL queue in blk_queue_io_stat(). Wrap it in blk_do_io_stat(). Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--block/blk-core.c6
-rw-r--r--block/blk.h8
2 files changed, 11 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index ca69f3d94100..29bcfac6c688 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -69,7 +69,7 @@ static void drive_stat_acct(struct request *rq, int new_io)
int rw = rq_data_dir(rq);
int cpu;
- if (!blk_fs_request(rq) || !disk || !blk_queue_io_stat(disk->queue))
+ if (!blk_fs_request(rq) || !disk || !blk_do_io_stat(disk->queue))
return;
cpu = part_stat_lock();
@@ -1667,7 +1667,7 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes)
{
struct gendisk *disk = req->rq_disk;
- if (!disk || !blk_queue_io_stat(disk->queue))
+ if (!disk || !blk_do_io_stat(disk->queue))
return;
if (blk_fs_request(req)) {
@@ -1686,7 +1686,7 @@ static void blk_account_io_done(struct request *req)
{
struct gendisk *disk = req->rq_disk;
- if (!disk || !blk_queue_io_stat(disk->queue))
+ if (!disk || !blk_do_io_stat(disk->queue))
return;
/*
diff --git a/block/blk.h b/block/blk.h
index 6e1ed40534e9..0dce92c37496 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -108,4 +108,12 @@ static inline int blk_cpu_to_group(int cpu)
#endif
}
+static inline int blk_do_io_stat(struct request_queue *q)
+{
+ if (q)
+ return blk_queue_io_stat(q);
+
+ return 0;
+}
+
#endif