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Subject[PATCH net-next 3/3] net: xgene: avoid bogus maybe-uninitialized warning
Date
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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