drivers: net: xgene: Simplify xgene_enet_setup_mss() to kill warning

With gcc-4.1.2 and -Os:

    drivers/net/ethernet/apm/xgene/xgene_enet_main.c: In function ‘xgene_enet_start_xmit’:
    drivers/net/ethernet/apm/xgene/xgene_enet_main.c:297: warning: ‘mss_index’ may be used uninitialized in this function

Using a separate variable to track success may confuse the compiler.
Preinitialize mss_index with -EBUSY and check for negative error values
instead to kill the warning.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 10 deletions

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index d0d0d12b531f..e536301acfde 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -293,36 +293,29 @@ static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring,
 static int xgene_enet_setup_mss(struct net_device *ndev, u32 mss)
 {
         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
-        bool mss_index_found = false;
-        int mss_index;
+        int mss_index = -EBUSY;
         int i;
 
         spin_lock(&pdata->mss_lock);
 
         /* Reuse the slot if MSS matches */
-        for (i = 0; !mss_index_found && i < NUM_MSS_REG; i++) {
+        for (i = 0; mss_index < 0 && i < NUM_MSS_REG; i++) {
                 if (pdata->mss[i] == mss) {
                         pdata->mss_refcnt[i]++;
                         mss_index = i;
-                        mss_index_found = true;
                 }
         }
 
         /* Overwrite the slot with ref_count = 0 */
-        for (i = 0; !mss_index_found && i < NUM_MSS_REG; i++) {
+        for (i = 0; mss_index < 0 && i < NUM_MSS_REG; i++) {
                 if (!pdata->mss_refcnt[i]) {
                         pdata->mss_refcnt[i]++;
                         pdata->mac_ops->set_mss(pdata, mss, i);
                         pdata->mss[i] = mss;
                         mss_index = i;
-                        mss_index_found = true;
                 }
         }
 
-        /* No slots with ref_count = 0 available, return busy */
-        if (!mss_index_found)
-                mss_index = -EBUSY;
-
         spin_unlock(&pdata->mss_lock);
 
         return mss_index;