[PATCH v12 04/17] s390/vfio-ap: No need to disable IRQ after queue reset

[Tony Krowiak]

The queues assigned to a matrix mediated device are currently reset when:

* The VFIO_DEVICE_RESET ioctl is invoked
* The mdev fd is closed by userspace (QEMU)
* The mdev is removed from sysfs.

Immediately after the reset of a queue, a call is made to disable
interrupts for the queue. This is entirely unnecessary because the reset of
a queue disables interrupts, so this will be removed.

Signed-off-by: Tony Krowiak <akrow...@linux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c | 28 +++++-----------------------
 1 file changed, 5 insertions(+), 23 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c 
b/drivers/s390/crypto/vfio_ap_ops.c
index 8e6972495daa..dc699fd54505 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -26,14 +26,6 @@
 
 static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
 
-static int match_apqn(struct device *dev, const void *data)
-{
-       struct vfio_ap_queue *q = dev_get_drvdata(dev);
-
-       return (q->apqn == *(int *)(data)) ? 1 : 0;
-}
-
-
 /**
  * vfio_ap_get_queue: Retrieve a queue with a specific APQN.
  * @matrix_mdev: the associated mediated matrix
@@ -1121,20 +1113,6 @@ static int vfio_ap_mdev_group_notifier(struct 
notifier_block *nb,
        return NOTIFY_OK;
 }
 
-static void vfio_ap_irq_disable_apqn(int apqn)
-{
-       struct device *dev;
-       struct vfio_ap_queue *q;
-
-       dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
-                                &apqn, match_apqn);
-       if (dev) {
-               q = dev_get_drvdata(dev);
-               vfio_ap_irq_disable(q);
-               put_device(dev);
-       }
-}
-
 static int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
                                    unsigned int retry)
 {
@@ -1169,6 +1147,7 @@ static int vfio_ap_mdev_reset_queues(struct mdev_device 
*mdev)
 {
        int ret;
        int rc = 0;
+       struct vfio_ap_queue *q;
        unsigned long apid, apqi;
        struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
@@ -1184,7 +1163,10 @@ static int vfio_ap_mdev_reset_queues(struct mdev_device 
*mdev)
                         */
                        if (ret)
                                rc = ret;
-                       vfio_ap_irq_disable_apqn(AP_MKQID(apid, apqi));
+
+                       q = vfio_ap_get_queue(matrix_mdev, AP_MKQID(apid, apqi);
+                       if (q)
+                               vfio_ap_free_aqic_resources(q);
                }
        }
 
-- 
2.21.1