From: Julian Wiedmann jwi@linux.ibm.com
commit 1c1dc8bda3a05c60877a6649775894db5343bdea upstream.
When the ESTABLISH ccw does not complete within the specified timeout, try our best to cancel the ccw program that is still active on the device. Otherwise the IO subsystem might be accessing it even after the driver eg. called qdio_free().
Fixes: 779e6e1c724d ("[S390] qdio: new qdio driver.") Signed-off-by: Julian Wiedmann jwi@linux.ibm.com Reviewed-by: Benjamin Block bblock@linux.ibm.com Cc: stable@vger.kernel.org # 2.6.27 Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/cio/qdio_main.c | 51 +++++++++++++++++++++++++------------------ 1 file changed, 30 insertions(+), 21 deletions(-)
--- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -1025,6 +1025,33 @@ static void qdio_shutdown_queues(struct } }
+static int qdio_cancel_ccw(struct qdio_irq *irq, int how) +{ + struct ccw_device *cdev = irq->cdev; + int rc; + + spin_lock_irq(get_ccwdev_lock(cdev)); + qdio_set_state(irq, QDIO_IRQ_STATE_CLEANUP); + if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) + rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); + else + /* default behaviour is halt */ + rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); + spin_unlock_irq(get_ccwdev_lock(cdev)); + if (rc) { + DBF_ERROR("%4x SHUTD ERR", irq->schid.sch_no); + DBF_ERROR("rc:%4d", rc); + return rc; + } + + wait_event_interruptible_timeout(cdev->private->wait_q, + irq->state == QDIO_IRQ_STATE_INACTIVE || + irq->state == QDIO_IRQ_STATE_ERR, + 10 * HZ); + + return 0; +} + /** * qdio_shutdown - shut down a qdio subchannel * @cdev: associated ccw device @@ -1063,27 +1090,7 @@ int qdio_shutdown(struct ccw_device *cde qdio_shutdown_queues(irq_ptr); qdio_shutdown_debug_entries(irq_ptr);
- /* cleanup subchannel */ - spin_lock_irq(get_ccwdev_lock(cdev)); - qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); - if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) - rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); - else - /* default behaviour is halt */ - rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); - spin_unlock_irq(get_ccwdev_lock(cdev)); - if (rc) { - DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); - DBF_ERROR("rc:%4d", rc); - goto no_cleanup; - } - - wait_event_interruptible_timeout(cdev->private->wait_q, - irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || - irq_ptr->state == QDIO_IRQ_STATE_ERR, - 10 * HZ); - -no_cleanup: + rc = qdio_cancel_ccw(irq_ptr, how); qdio_shutdown_thinint(irq_ptr); qdio_shutdown_irq(irq_ptr);
@@ -1316,10 +1323,12 @@ int qdio_establish(struct ccw_device *cd return 0;
err_ccw_timeout: + qdio_cancel_ccw(irq_ptr, QDIO_FLAG_CLEANUP_USING_CLEAR); err_ccw_start: qdio_shutdown_thinint(irq_ptr); err_thinint: qdio_shutdown_irq(irq_ptr); + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); mutex_unlock(&irq_ptr->setup_mutex); return rc; }