linux-kernel - [PATCH v2] drivers: net: xgene: Rewrite loop in xgene_enet_ecc

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Date:	Wed, 22 Oct 2014 09:39:41 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"David S. Miller" <davem@...emloft.net>,
	Iyappan Subramanian <isubramanian@....com>,
	Keyur Chudgar <kchudgar@....com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH v2] drivers: net: xgene: Rewrite loop in xgene_enet_ecc_init()

drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c: In function ‘xgene_enet_ecc_init’:
drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c:126: warning: ‘data’ may be used uninitialized in this function

Depending on the arbitrary value on the stack, the loop may terminate
too early, and cause a bogus -ENODEV failure.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
v2: Rewrite the loop instead of pre-initializing data.

 drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
index e6d24c2101982444..2a497b38ed420495 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
@@ -127,17 +127,15 @@ static int xgene_enet_ecc_init(struct xgene_enet_pdata *p)
 	int i;
 
 	xgene_enet_wr_diag_csr(p, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0);
-	for (i = 0; i < 10 && data != ~0U ; i++) {
+	for (i = 0; i < 10; i++) {
 		usleep_range(100, 110);
 		data = xgene_enet_rd_diag_csr(p, ENET_BLOCK_MEM_RDY_ADDR);
+		if (data == ~0U)
+			return 0;
 	}
 
-	if (data != ~0U) {
-		netdev_err(ndev, "Failed to release memory from shutdown\n");
-		return -ENODEV;
-	}
-
-	return 0;
+	netdev_err(ndev, "Failed to release memory from shutdown\n");
+	return -ENODEV;
 }
 
 static void xgene_enet_config_ring_if_assoc(struct xgene_enet_pdata *p)
-- 
1.9.1

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