Commit ebac3800 authored by Bryan O'Sullivan's avatar Bryan O'Sullivan Committed by Roland Dreier

IB/ipath: fix spinlock recursion bug

The local loopback path for RC can lock the rkey table lock without
blocking interrupts.  The receive interrupt path can then call
ipath_rkey_ok() and deadlock.  Remove the redundant lock.
Signed-off-by: default avatarBryan O'Sullivan <bos@pathscale.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 1faadfac
......@@ -136,9 +136,7 @@ int ipath_lkey_ok(struct ipath_lkey_table *rkt, struct ipath_sge *isge,
ret = 1;
goto bail;
}
spin_lock(&rkt->lock);
mr = rkt->table[(sge->lkey >> (32 - ib_ipath_lkey_table_size))];
spin_unlock(&rkt->lock);
if (unlikely(mr == NULL || mr->lkey != sge->lkey)) {
ret = 0;
goto bail;
......@@ -184,8 +182,6 @@ bail:
* @acc: access flags
*
* Return 1 if successful, otherwise 0.
*
* The QP r_rq.lock should be held.
*/
int ipath_rkey_ok(struct ipath_ibdev *dev, struct ipath_sge_state *ss,
u32 len, u64 vaddr, u32 rkey, int acc)
......@@ -196,9 +192,7 @@ int ipath_rkey_ok(struct ipath_ibdev *dev, struct ipath_sge_state *ss,
size_t off;
int ret;
spin_lock(&rkt->lock);
mr = rkt->table[(rkey >> (32 - ib_ipath_lkey_table_size))];
spin_unlock(&rkt->lock);
if (unlikely(mr == NULL || mr->lkey != rkey)) {
ret = 0;
goto bail;
......
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