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staging: lustre: fix lock imbalance 

nrs_resource_put_safe() might hold a lock one one struct
while operating on the other.
There are 2 levels of structures.
Use nrs_policy_put(), which has locking baked in.

sparse gives the following warning:
drivers/staging/lustre//lustre/ptlrpc/nrs.c:498:39:
warning: context imbalance in 'nrs_resource_put_safe' -
  different lock contexts for basic block

Signed-off-by: Joshua Clayton <stillcompiling@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joshua Clayton 2015-12-26 22:47:36 -08:00 committed by Greg Kroah-Hartman
parent ad0d779938
commit a4113d61e5
1 changed files with 2 additions and 12 deletions
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14
drivers/staging/lustre/lustre/ptlrpc/nrs.c
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@ -482,7 +482,6 @@ static void nrs_resource_get_safe(struct ptlrpc_nrs *nrs,
static void nrs_resource_put_safe(struct ptlrpc_nrs_resource **resp)
{
struct ptlrpc_nrs_policy *pols[NRS_RES_MAX];
struct ptlrpc_nrs *nrs = NULL;
int i;
for (i = 0; i < NRS_RES_MAX; i++) {
@ -496,18 +495,9 @@ static void nrs_resource_put_safe(struct ptlrpc_nrs_resource **resp)
}
for (i = 0; i < NRS_RES_MAX; i++) {
if (pols[i] == NULL)
continue;
if (nrs == NULL) {
nrs = pols[i]->pol_nrs;
spin_lock(&nrs->nrs_lock);
}
nrs_policy_put_locked(pols[i]);
if (pols[i])
nrs_policy_put(pols[i]);
}
if (nrs != NULL)
spin_unlock(&nrs->nrs_lock);
}
/**