3.7-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mike Marciniszyn <mike.marcinis...@intel.com>
commit d359f35430c4ea4dd4e24d809aeaeff1fa54c314 upstream.
Commit 1fb9fed6d489 ("IB/qib: Fix QP RCU sparse warning") broke QP
hash list deletion in qp_remove() badly.
This patch restores the former for loop behavior, while still fixing
the sparse warnings.
Reviewed-by: Gary Leshner <gary.s.lesh...@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marcinis...@intel.com>
Signed-off-by: Roland Dreier <rol...@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/infiniband/hw/qib/qib_qp.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
--- a/drivers/infiniband/hw/qib/qib_qp.c
+++ b/drivers/infiniband/hw/qib/qib_qp.c
@@ -263,20 +263,15 @@ static void remove_qp(struct qib_ibdev *
struct qib_qp __rcu **qpp;
qpp = &dev->qp_table[n];
- q = rcu_dereference_protected(*qpp,
- lockdep_is_held(&dev->qpt_lock));
- for (; q; qpp = &q->next) {
+ for (; (q = rcu_dereference_protected(*qpp,
+ lockdep_is_held(&dev->qpt_lock))) != NULL;
+ qpp = &q->next)
if (q == qp) {
atomic_dec(&qp->refcount);
*qpp = qp->next;
rcu_assign_pointer(qp->next, NULL);
- q = rcu_dereference_protected(*qpp,
- lockdep_is_held(&dev->qpt_lock));
break;
}
- q = rcu_dereference_protected(*qpp,
- lockdep_is_held(&dev->qpt_lock));
- }
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
--
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