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authorArnd Bergmann <arnd@arndb.de>2016-07-21 21:28:34 +0200
committerDavid S. Miller <davem@davemloft.net>2016-07-25 10:32:59 -0700
commita1b43eddaec5a3fea55e1581caf217abda2d3147 (patch)
treee2cb2091dd2df3d107ba67eda2ddb0d9989d998c /net
parent974b996345e152752807b0d322aa43f21e49a21a (diff)
downloadblackbird-op-linux-a1b43eddaec5a3fea55e1581caf217abda2d3147.tar.gz
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net/ncsi: avoid maybe-uninitialized warning
gcc-4.9 and higher warn about the newly added NSCI code: net/ncsi/ncsi-manage.c: In function 'ncsi_process_next_channel': net/ncsi/ncsi-manage.c:1003:2: error: 'old_state' may be used uninitialized in this function [-Werror=maybe-uninitialized] The warning is a false positive and therefore harmless, but it would be good to avoid it anyway. I have determined that the barrier in the spin_unlock_irqsave() is what confuses gcc to the point that it cannot track whether the variable was unused or not. This rearranges the code in a way that makes it obvious to gcc that old_state is always initialized at the time of use, functionally this should not change anything. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ncsi/ncsi-manage.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index d627a39ddcd0..ef017b871857 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -982,23 +982,18 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
spin_lock_irqsave(&ndp->lock, flags);
nc = list_first_or_null_rcu(&ndp->channel_queue,
struct ncsi_channel, link);
- if (nc) {
- old_state = xchg(&nc->state, NCSI_CHANNEL_INVISIBLE);
- list_del_init(&nc->link);
+ if (!nc) {
+ spin_unlock_irqrestore(&ndp->lock, flags);
+ goto out;
}
+
+ old_state = xchg(&nc->state, NCSI_CHANNEL_INVISIBLE);
+ list_del_init(&nc->link);
+
spin_unlock_irqrestore(&ndp->lock, flags);
ndp->active_channel = nc;
- ndp->active_package = nc ? nc->package : NULL;
- if (!nc) {
- if (ndp->flags & NCSI_DEV_RESHUFFLE) {
- ndp->flags &= ~NCSI_DEV_RESHUFFLE;
- return ncsi_choose_active_channel(ndp);
- }
-
- ncsi_report_link(ndp, false);
- return -ENODEV;
- }
+ ndp->active_package = nc->package;
switch (old_state) {
case NCSI_CHANNEL_INACTIVE:
@@ -1017,6 +1012,17 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
}
return 0;
+
+out:
+ ndp->active_channel = NULL;
+ ndp->active_package = NULL;
+ if (ndp->flags & NCSI_DEV_RESHUFFLE) {
+ ndp->flags &= ~NCSI_DEV_RESHUFFLE;
+ return ncsi_choose_active_channel(ndp);
+ }
+
+ ncsi_report_link(ndp, false);
+ return -ENODEV;
}
#if IS_ENABLED(CONFIG_IPV6)
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