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| author | Tejun Heo <tj@kernel.org> | 2011-05-26 21:06:50 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-05-26 21:06:50 +0200 |
| commit | 75e3f3ee3c64968d42f4843ec49e579f84b5aa0c (patch) | |
| tree | 0522cb42944f2da85143f234b0f4b3f5319834eb /block | |
| parent | 8892cbaf686fb18a5f0558b9fd7773b32c0c7852 (diff) | |
| download | blackbird-op-linux-75e3f3ee3c64968d42f4843ec49e579f84b5aa0c.tar.gz blackbird-op-linux-75e3f3ee3c64968d42f4843ec49e579f84b5aa0c.zip | |
block: always allocate genhd->ev if check_events is implemented
9fd097b149 (block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe
drivers) removed DISK_EVENT_MEDIA_CHANGE from legacy/fringe block
drivers which have inadequate ->check_events(). Combined with earlier
change 7c88a168da (block: don't propagate unlisted DISK_EVENTs to
userland), this enables using ->check_events() for internal processing
while avoiding enabling in-kernel block event polling which can lead
to infinite event loop.
Unfortunately, this made many drivers including floppy without any bit
set in disk->events and ->async_events in which case disk_add_events()
simply skipped allocation of disk->ev, which disables whole event
handling. As ->check_events() is still used during open processing
for revalidation, this can lead to open failure.
This patch always allocates disk->ev if ->check_events is implemented.
In the long term, it would make sense to simply include the event
structure inline into genhd as it's now used by virtually all block
devices.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Ondrej Zary <linux@rainbow-software.org>
Reported-by: Alex Villacis Lasso <avillaci@ceibo.fiec.espol.edu.ec>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/genhd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/genhd.c b/block/genhd.c index 2dd988723d73..95822ae25cfe 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1728,7 +1728,7 @@ static void disk_add_events(struct gendisk *disk) { struct disk_events *ev; - if (!disk->fops->check_events || !(disk->events | disk->async_events)) + if (!disk->fops->check_events) return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
