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IB/ehca: fix handling idr_alloc result

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The function can return negative value.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrzej Hajda 2015-09-21 15:33:36 +02:00 committed by Greg Kroah-Hartman
parent 0bc2763f56
commit 43b2ec01d2
1 changed files with 7 additions and 6 deletions
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13
drivers/staging/rdma/ehca/ehca_cq.c
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@ -130,7 +130,7 @@ struct ib_cq *ehca_create_cq(struct ib_device *device,
void *vpage;
u32 counter;
u64 rpage, cqx_fec, h_ret;
int ipz_rc, i;
int rc, i;
unsigned long flags;
if (attr->flags)
@ -170,16 +170,17 @@ struct ib_cq *ehca_create_cq(struct ib_device *device,
idr_preload(GFP_KERNEL);
write_lock_irqsave(&ehca_cq_idr_lock, flags);
my_cq->token = idr_alloc(&ehca_cq_idr, my_cq, 0, 0x2000000, GFP_NOWAIT);
rc = idr_alloc(&ehca_cq_idr, my_cq, 0, 0x2000000, GFP_NOWAIT);
write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
idr_preload_end();
if (my_cq->token < 0) {
if (rc < 0) {
cq = ERR_PTR(-ENOMEM);
ehca_err(device, "Can't allocate new idr entry. device=%p",
device);
goto create_cq_exit1;
}
my_cq->token = rc;
/*
* CQs maximum depth is 4GB-64, but we need additional 20 as buffer
@ -195,11 +196,11 @@ struct ib_cq *ehca_create_cq(struct ib_device *device,
goto create_cq_exit2;
}
ipz_rc = ipz_queue_ctor(NULL, &my_cq->ipz_queue, param.act_pages,
rc = ipz_queue_ctor(NULL, &my_cq->ipz_queue, param.act_pages,
EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0, 0);
if (!ipz_rc) {
if (!rc) {
ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%i device=%p",
ipz_rc, device);
rc, device);
cq = ERR_PTR(-EINVAL);
goto create_cq_exit3;
}