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s390/qdio: cancel the ESTABLISH ccw after timeout

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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: 779e6e1c72 ("[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>
This commit is contained in:
Julian Wiedmann 2021-05-31 18:33:02 +03:00 committed by Greg Kroah-Hartman
parent bcc0c767f9
commit 76668bdee0
1 changed files with 30 additions and 21 deletions
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51
drivers/s390/cio/qdio_main.c
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@ -1025,6 +1025,33 @@ static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
}
}
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 *cdev, int how)
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 *cdev,
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;
}