[PATCH v3] drivers: net: xgene: Rewrite buggy loop in xgene_enet_ecc_init()

[PATCH v3] drivers: net: xgene: Rewrite buggy loop in xgene_enet_ecc_init()

[Geert Uytterhoeven]

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@linux-m68k.org>
---
v3:
  - Use "do { ... } while (...);" instead of "for (...) { ... }",
v2:
  - Rewrite the loop instead of pre-initializing data.

 drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 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..c22f32622fa9a50a 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
@@ -124,20 +124,18 @@ static int xgene_enet_ecc_init(struct xgene_enet_pdata *p)
 {
 	struct net_device *ndev = p->ndev;
 	u32 data;
-	int i;
+	int i = 0;
 
 	xgene_enet_wr_diag_csr(p, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0);
-	for (i = 0; i < 10 && data != ~0U ; i++) {
+	do {
 		usleep_range(100, 110);
 		data = xgene_enet_rd_diag_csr(p, ENET_BLOCK_MEM_RDY_ADDR);
-	}
+		if (data == ~0U)
+			return 0;
+	} while (++i < 10);
 
-	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

Re: [PATCH v3] drivers: net: xgene: Rewrite buggy loop in xgene_enet_ecc_init()

[David Miller]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: Text/Plain; charset=iso-8859-7, Size: 800 bytes --]

From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Thu, 23 Oct 2014 10:25:53 +0200

> 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@linux-m68k.org>
> ---
> v3:
>   - Use "do { ... } while (...);" instead of "for (...) { ... }",
> v2:
>   - Rewrite the loop instead of pre-initializing data.

Applied, thank you.
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥