linux-kernel - [PATCH 1/1] net: qed: set error code on failure

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Message-Id: <1480849140-16166-1-git-send-email-bianpan201603@163.com>
Date:   Sun,  4 Dec 2016 18:59:00 +0800
From:   Pan Bian <bianpan201603@....com>
To:     Yuval Mintz <Yuval.Mintz@...ium.com>,
        Ariel Elior <Ariel.Elior@...ium.com>,
        everest-linux-l2@...ium.com, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] net: qed: set error code on failure

From: Pan Bian <bianpan2016@....com>

When calling dma_mapping_error(), the value of return variable rc is 0.
And when the call returns an unexpected value, rc is not set to a
negative errno. Thus, it will return 0 on the error path, and its
callers cannot detect the bug. This patch fixes the bug, assigning
"-ENOMEM" to err.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=189041

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/net/ethernet/qlogic/qed/qed_ll2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index f95385c..62ae55b 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -1730,6 +1730,7 @@ static int qed_ll2_start_xmit(struct qed_dev *cdev, struct sk_buff *skb)
 						       mapping))) {
 				DP_NOTICE(cdev,
 					  "Unable to map frag - dropping packet\n");
+				rc = -ENOMEM;
 				goto err;
 			}
 		} else {
-- 
1.9.1