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NFSv4.1: work around -Wmaybe-uninitialized warning 

A bugfix introduced a harmless gcc warning in nfs4_slot_seqid_in_use if
we enable -Wmaybe-uninitialized again:

  fs/nfs/nfs4session.c:203:54: error: 'cur_seq' may be used uninitialized in this function [-Werror=maybe-uninitialized]

gcc is not smart enough to conclude that the IS_ERR/PTR_ERR pair results
in a nonzero return value here.  Using PTR_ERR_OR_ZERO() instead makes
this clear to the compiler.

Fixes: e09c978aae ("NFSv4.1: Fix Oopsable condition in server callback races")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arnd Bergmann 2016-11-10 17:44:45 +01:00 committed by Linus Torvalds
parent a76bcf557e
commit e84efa32b9
1 changed files with 6 additions and 4 deletions
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fs/nfs/nfs4session.c
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@ -178,12 +178,14 @@ static int nfs4_slot_get_seqid(struct nfs4_slot_table *tbl, u32 slotid,
__must_hold(&tbl->slot_tbl_lock)
{
struct nfs4_slot *slot;
int ret;
slot = nfs4_lookup_slot(tbl, slotid);
if (IS_ERR(slot))
return PTR_ERR(slot);
*seq_nr = slot->seq_nr;
return 0;
ret = PTR_ERR_OR_ZERO(slot);
if (!ret)
*seq_nr = slot->seq_nr;
return ret;
}
/*