linux-kernel - [PATCH] RDMA/qedr: Fix some error handling

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Date:   Sat, 18 Feb 2017 12:28:15 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     dledford@...hat.com, sean.hefty@...el.com,
        hal.rosenstock@...il.com, Ram.Amrani@...ium.com,
        Michal.Kalderon@...ium.com, rajesh.borundia@...ium.com,
        weiyongjun1@...wei.com
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] RDMA/qedr: Fix some error handling

'qedr_alloc_pbl_tbl()' can not return NULL.

In qedr_init_user_queue():
 - simplify the test for the return value, no need to test for NULL
 - propagate the error pointer if needed, otherwise 0 (success) is returned.
   This is spurious.

In init_mr_info():
 - test the return value with IS_ERR
 - propagate the error pointer if needed instead of an exlictit -ENOMEM.
   This is a no-op as the only error pointer that we can have here is
   already -ENOMEM

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/infiniband/hw/qedr/verbs.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index ef83a3f322d6..0c51657af151 100644
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -771,8 +771,10 @@ static inline int qedr_init_user_queue(struct ib_ucontext *ib_ctx,
 		goto err0;
 
 	q->pbl_tbl = qedr_alloc_pbl_tbl(dev, &q->pbl_info, GFP_KERNEL);
-	if (IS_ERR_OR_NULL(q->pbl_tbl))
+	if (IS_ERR(q->pbl_tbl)) {
+		rc = PTR_ERR(q->pbl_tbl);
 		goto err0;
+	}
 
 	qedr_populate_pbls(dev, q->umem, q->pbl_tbl, &q->pbl_info);
 
@@ -2105,8 +2107,8 @@ static int init_mr_info(struct qedr_dev *dev, struct mr_info *info,
 		goto done;
 
 	info->pbl_table = qedr_alloc_pbl_tbl(dev, &info->pbl_info, GFP_KERNEL);
-	if (!info->pbl_table) {
-		rc = -ENOMEM;
+	if (IS_ERR(info->pbl_table)) {
+		rc = PTR_ERR(info->pbl_table);
 		goto done;
 	}
 
@@ -2117,7 +2119,7 @@ static int init_mr_info(struct qedr_dev *dev, struct mr_info *info,
 	 * list and allocating another one
 	 */
 	tmp = qedr_alloc_pbl_tbl(dev, &info->pbl_info, GFP_KERNEL);
-	if (!tmp) {
+	if (IS_ERR(tmp)) {
 		DP_DEBUG(dev, QEDR_MSG_MR, "Extra PBL is not allocated\n");
 		goto done;
 	}
-- 
2.9.3