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Subject[PATCH v2] drivers: net: xgene: Rewrite loop in xgene_enet_ecc_init()
Date
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>
---
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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