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sunrpc: avoid warning in gss_key_timeout

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The gss_key_timeout() function causes a harmless warning in some
configurations, e.g. ARM imx_v6_v7_defconfig with gcc-5.2, if the
compiler cannot figure out the state of the 'expire' variable across
an rcu_read_unlock():

net/sunrpc/auth_gss/auth_gss.c: In function 'gss_key_timeout':
net/sunrpc/auth_gss/auth_gss.c:1422:211: warning: 'expire' may be used uninitialized in this function [-Wmaybe-uninitialized]

To avoid this warning without adding a bogus initialization, this
rewrites the function so the comparison is done inside of the
critical section. As a side-effect, it also becomes slightly
easier to understand because the implementation now more closely
resembles the comment above it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: c5e6aecd03 ("sunrpc: fix RCU handling of gc_ctx field")
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Arnd Bergmann 2015-10-09 16:13:45 +02:00 committed by J. Bruce Fields
parent 0d0f4aab4e
commit cc6a7aab55
1 changed files with 6 additions and 7 deletions
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13
net/sunrpc/auth_gss/auth_gss.c
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@ -1411,17 +1411,16 @@ gss_key_timeout(struct rpc_cred *rc)
{
struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
struct gss_cl_ctx *ctx;
unsigned long now = jiffies;
unsigned long expire;
unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
int ret = 0;
rcu_read_lock();
ctx = rcu_dereference(gss_cred->gc_ctx);
if (ctx)
expire = ctx->gc_expiry - (gss_key_expire_timeo * HZ);
if (!ctx || time_after(timeout, ctx->gc_expiry))
ret = -EACCES;
rcu_read_unlock();
if (!ctx || time_after(now, expire))
return -EACCES;
return 0;
return ret;
}
static int