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Subject[029/146] block: always allocate genhd->ev if check_events is
2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------
implemented

From: Tejun Heo <tj@kernel.org>

commit 75e3f3ee3c64968d42f4843ec49e579f84b5aa0c upstream.

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>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
block/genhd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1724,7 +1724,7 @@ static void disk_add_events(struct gendi
{
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);



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