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author | Arnd Bergmann <arnd@arndb.de> | 2016-07-21 22:28:34 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2016-07-25 20:32:59 +0300 |
commit | a1b43eddaec5a3fea55e1581caf217abda2d3147 (patch) | |
tree | e2cb2091dd2df3d107ba67eda2ddb0d9989d998c /net/ncsi/ncsi-manage.c | |
parent | 974b996345e152752807b0d322aa43f21e49a21a (diff) | |
download | linux-a1b43eddaec5a3fea55e1581caf217abda2d3147.tar.xz |
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/ncsi/ncsi-manage.c')
-rw-r--r-- | net/ncsi/ncsi-manage.c | 32 |
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) |