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[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>
This commit is contained in:
Zachary Amsden 2005-11-09 13:23:01 +01:00 committed by Jens Axboe
parent cd52d1ee9a
commit b8ea2cb512
1 changed files with 2 additions and 2 deletions
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4
block/elevator.c
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@ -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;