Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [PATCH net-next 3/3] net: xgene: avoid bogus maybe-uninitialized warning | Date | Thu, 8 Dec 2016 22:57:05 +0100 |
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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 <arnd@arndb.de> --- drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c index 6c7eea8b36af..dba4b883e9a3 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; } -- 2.9.0
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