drivers: net: xgene: Rewrite buggy 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@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files 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 e6d24c210198..c22f32622fa9 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)