[10/38] ide-disk: Fix request requeuing

[Greg KH]

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Borislav Petkov <bp@xxxxxxxxx>

commit 2c8fc867602e385fd2abe76da0b6bda8ed907547 upstream.

Simon Kirby reported that on his RAID setup with idedisk underneath
the box OOMs after a couple of days of runtime. Running with
CONFIG_DEBUG_KMEMLEAK pointed to idedisk_prep_fn() which unconditionally
allocates an ide_cmd struct. However, ide_requeue_and_plug() can be
called more than once per request, either from the request issue or the
IRQ handler path and do blk_peek_request() ends up in idedisk_prep_fn()
repeatedly, allocating a struct ide_cmd everytime and "forgetting" the
previous pointer.

Make sure the code reuses the old allocated chunk.

Reported-and-tested-by: Simon Kirby <sim@xxxxxxxxxx>
Link: http://marc.info/?l=linux-kernel&m=131667641517919
Link: http://lkml.kernel.org/r/20110922072643.GA27232@xxxxxxxxxx
Signed-off-by: Borislav Petkov <bp@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/ide/ide-disk.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -435,7 +435,12 @@ static int idedisk_prep_fn(struct reques
 	if (!(rq->cmd_flags & REQ_FLUSH))
 		return BLKPREP_OK;
 
-	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
+	if (rq->special) {
+		cmd = rq->special;
+		memset(cmd, 0, sizeof(*cmd));
+	} else {
+		cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
+	}
 
 	/* FIXME: map struct ide_taskfile on rq->cmd[] */
 	BUG_ON(cmd == NULL);


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