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RDMA/nes: Check cqp_avail_reqs is empty after locking the list

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Between the first empty list check and locking the list, the list can
change.  Check it again after it is locked to make sure the list is
still not empty.

Signed-off-by: Faisal Latif <[email protected]>
Signed-off-by: Chien Tung <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
This commit is contained in:
Faisal Latif 2008-11-21 20:50:55 -06:00 • committed by Roland Dreier
commit f3181a10e1
1 changed files with 6 additions and 3 deletions
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9
drivers/infiniband/hw/nes/nes_utils.c
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@ -540,11 +540,14 @@ struct nes_cqp_request *nes_get_cqp_request(struct nes_device *nesdev)
if (!list_empty(&nesdev->cqp_avail_reqs)) {
spin_lock_irqsave(&nesdev->cqp.lock, flags);
cqp_request = list_entry(nesdev->cqp_avail_reqs.next,
if (!list_empty(&nesdev->cqp_avail_reqs)) {
cqp_request = list_entry(nesdev->cqp_avail_reqs.next,
struct nes_cqp_request, list);
list_del_init(&cqp_request->list);
list_del_init(&cqp_request->list);
}
spin_unlock_irqrestore(&nesdev->cqp.lock, flags);
} else {
}
if (cqp_request == NULL) {
cqp_request = kzalloc(sizeof(struct nes_cqp_request), GFP_KERNEL);
if (cqp_request) {
cqp_request->dynamic = 1;