IB/ipath: Wait for PIO available interrupt
The send function is called when posting new send work requests.
There is no point in trying to send a packet if the QP is already
waiting for a HW send buffer so don't clear the busy bit until the
buffer available interrupt happens.
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/ipath/ipath_ruc.c b/drivers/infiniband/hw/ipath/ipath_ruc.c
index 8c5d20a..8371186 100644
--- a/drivers/infiniband/hw/ipath/ipath_ruc.c
+++ b/drivers/infiniband/hw/ipath/ipath_ruc.c
@@ -503,11 +503,9 @@
* could be called. If we are still in the tasklet function,
* tasklet_hi_schedule() will not call us until the next time
* tasklet_hi_schedule() is called.
- * We clear the tasklet flag now since we are committing to return
- * from the tasklet function.
+ * We leave the busy flag set so that another post send doesn't
+ * try to put the same QP on the piowait list again.
*/
- clear_bit(IPATH_S_BUSY, &qp->s_busy);
- tasklet_unlock(&qp->s_task);
want_buffer(dev->dd);
dev->n_piowait++;
}