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drivers: net: xgene: Rewrite buggy loop in xgene_enet_ecc_init()

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geert Uytterhoeven 2014-10-23 10:25:53 +02:00 committed by David S. Miller
parent 013f6579c6
commit b71e821de5
1 changed files with 7 additions and 9 deletions
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16
drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c
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@ -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)