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Commit db5518cd authored by Ralph Campbell's avatar Ralph Campbell Committed by Roland Dreier
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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: default avatarRalph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 06ee1090

drivers/infiniband/hw/ipath/ipath_ruc.c

+2 −4
Original line number Diff line number Diff line
@@ -503,11 +503,9 @@ void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev) 
	 * 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++;

}

drivers/infiniband/hw/ipath/ipath_verbs.c

+1 −0
Original line number Diff line number Diff line
@@ -948,6 +948,7 @@ int ipath_ib_piobufavail(struct ipath_ibdev *dev) 
		qp = list_entry(dev->piowait.next, struct ipath_qp,

				piowait);

		list_del_init(&qp->piowait);

		clear_bit(IPATH_S_BUSY, &qp->s_busy);

		tasklet_hi_schedule(&qp->s_task);

	}

	spin_unlock_irqrestore(&dev->pending_lock, flags);