IB/qib: Fix race between qib_error_qp() and receive packet processing
When transitioning a QP to the error state, in progress RWQEs need to
be marked complete. This also involves releasing the reference count
to the memory regions referenced in the SGEs. The locking in the
receive packet processing wasn't sufficient to prevent qib_error_qp()
from modifying the r_sge state at the same time, thus leading to
kernel panics.
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/qib/qib_qp.c b/drivers/infiniband/hw/qib/qib_qp.c
index e0f65e3..6c39851 100644
--- a/drivers/infiniband/hw/qib/qib_qp.c
+++ b/drivers/infiniband/hw/qib/qib_qp.c
@@ -450,7 +450,7 @@
*
* Flushes both send and receive work queues.
* Returns true if last WQE event should be generated.
- * The QP s_lock should be held and interrupts disabled.
+ * The QP r_lock and s_lock should be held and interrupts disabled.
* If we are already in error state, just return.
*/
int qib_error_qp(struct qib_qp *qp, enum ib_wc_status err)