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| author | Zachary Amsden <zach@vmware.com> | 2005-11-09 13:23:01 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2005-11-12 10:54:48 +0100 |
| commit | b8ea2cb5120a92fe63053a2896be42abbb919a76 (patch) | |
| tree | edbe103c6c5c2fe971ee270d8b0e3ae7dab8af83 /block/elevator.c | |
| parent | cd52d1ee9a92587b242d946a2300a3245d3b885a (diff) | |
| download | lwn-b8ea2cb5120a92fe63053a2896be42abbb919a76.tar.gz lwn-b8ea2cb5120a92fe63053a2896be42abbb919a76.zip | |
[BLOCK] elevator init fixes
I got a panic in the elevator code, backtrace :
Unable to handle kernel NULL pointer dereference at virtual address 00000060
..
EIP is at elevator_put+0x0/0x30 (null elevator_type passed)
..
elevator_init+0x38
blk_init_queu_node+0xc9
floppy_init+0xdb
do_initcalls+0x23
init+0x10a
init+0x0
Clearly if the kmalloc here fails, e->elevator_type is not yet set; this
appears to be the correct fix, but I think I probably hit the second case
due to a race condition. Someone more familiar with the elevator code
should look at this more closely until I can determine if I can reproduce.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/elevator.c')
| -rw-r--r-- | block/elevator.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/elevator.c b/block/elevator.c index d4a49a3df829..23cfbe528be1 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -190,14 +190,14 @@ int elevator_init(request_queue_t *q, char *name) eq = kmalloc(sizeof(struct elevator_queue), GFP_KERNEL); if (!eq) { - elevator_put(e->elevator_type); + elevator_put(e); return -ENOMEM; } ret = elevator_attach(q, e, eq); if (ret) { kfree(eq); - elevator_put(e->elevator_type); + elevator_put(e); } return ret; |