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Merge branch 'for-linus' of git://git.kernel.dk/linux-block

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Pull block layer fixes from Jens Axboe:
 "A small collection of fixes for the current series. It contains:

   - A fix for a use-after-free of a request in blk-mq.  From Ming Lei

   - A fix for a blk-mq bug that could attempt to dereference a NULL rq
     if allocation failed

   - Two xen-blkfront small fixes

   - Cleanup of submit_bio_wait() type uses in the kernel, unifying
     that.  From Kent

   - A fix for 32-bit blkg_rwstat reading.  I apologize for this one
     looking mangled in the shortlog, it's entirely my fault for missing
     an empty line between the description and body of the text"

* 'for-linus' of git://git.kernel.dk/linux-block:
  blk-mq: fix use-after-free of request
  blk-mq: fix dereference of rq->mq_ctx if allocation fails
  block: xen-blkfront: Fix possible NULL ptr dereference
  xen-blkfront: Silence pfn maybe-uninitialized warning
  block: submit_bio_wait() conversions
  Update of blkg_stat and blkg_rwstat may happen in bh context
This commit is contained in:
Linus Torvalds
2013-12-05 15:33:27 -08:00
parent 29be6345bb 0d11e6aca3
commit 5ee540613d
11 changed files with 44 additions and 127 deletions
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12
drivers/md/md.c
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@@ -776,16 +776,10 @@ void md_super_wait(struct mddev *mddev)
finish_wait(&mddev->sb_wait, &wq);
}
static void bi_complete(struct bio *bio, int error)
{
complete((struct completion*)bio->bi_private);
}
int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
struct page *page, int rw, bool metadata_op)
{
struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
struct completion event;
int ret;
rw |= REQ_SYNC;
@@ -801,11 +795,7 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
else
bio->bi_sector = sector + rdev->data_offset;
bio_add_page(bio, page, size, 0);
init_completion(&event);
bio->bi_private = &event;
bio->bi_end_io = bi_complete;
submit_bio(rw, bio);
wait_for_completion(&event);
submit_bio_wait(rw, bio);
ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
bio_put(bio);