From: Geert Uytterhoeven <geert@linux-m68k.org>
To: "David S . Miller" <davem@davemloft.net>,
Iyappan Subramanian <isubramanian@apm.com>,
Keyur Chudgar <kchudgar@apm.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH] drivers: net: xgene: Simplify xgene_enet_setup_mss() to kill warning
Date: Fri, 24 Feb 2017 11:30:03 +0100 [thread overview]
Message-ID: <1487932203-31799-1-git-send-email-geert@linux-m68k.org> (raw)
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>
---
Compile-tested only.
drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 13 +++----------
1 file 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 d0d0d12b531fc683..e536301acfdec9fd 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;
--
2.7.4
next reply other threads:[~2017-02-24 10:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-24 10:30 Geert Uytterhoeven [this message]
2017-02-24 19:29 ` [PATCH] drivers: net: xgene: Simplify xgene_enet_setup_mss() to kill warning David Miller
2017-02-24 20:13 ` Iyappan Subramanian
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