From: Arnd Bergmann Date: Thu, 8 Dec 2016 21:57:05 +0000 (+0100) Subject: net: xgene: avoid bogus maybe-uninitialized warning X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f006b2c5dff35cb32ee77a0cbcabb52d90118c19;p=linux-beck.git net: xgene: avoid bogus maybe-uninitialized warning In some configurations, gcc cannot trace the state of variables across a spin_unlock() barrier, leading to a warning about correct code: xgene_enet_main.c: In function 'xgene_enet_start_xmit': ../../../phy/mdio-xgene.h:112:14: error: 'mss_index' may be used uninitialized in this function [-Werror=maybe-uninitialized] Here we can trivially move the assignment before that spin_unlock, which reliably avoids the warning. Fixes: e3978673f514 ("drivers: net: xgene: Fix MSS programming") Signed-off-by: Arnd Bergmann Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c index 884a334e82d0..523b8eff6d7b 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c @@ -319,11 +319,11 @@ static int xgene_enet_setup_mss(struct net_device *ndev, u32 mss) } } - spin_unlock(&pdata->mss_lock); - /* No slots with ref_count = 0 available, return busy */ if (!mss_index_found) - return -EBUSY; + mss_index = -EBUSY; + + spin_unlock(&pdata->mss_lock); return mss_index; }