Merge tag 's390-6.0-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fix from Vasily Gorbik:

- Fix potential hangs in VFIO AP driver

* tag 's390-6.0-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/vfio-ap: bypass unnecessary processing of AP resources

drivers/s390/crypto/vfio_ap_ops.c

···
 		goto done;
 	}
 
+	if (test_bit_inv(apid, matrix_mdev->matrix.apm)) {
+		ret = count;
+		goto done;
+	}
+
 	set_bit_inv(apid, matrix_mdev->matrix.apm);
 
 	ret = vfio_ap_mdev_validate_masks(matrix_mdev);
···
 		goto done;
 	}
 
+	if (!test_bit_inv(apid, matrix_mdev->matrix.apm)) {
+		ret = count;
+		goto done;
+	}
+
 	clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
 	vfio_ap_mdev_hot_unplug_adapter(matrix_mdev, apid);
 	ret = count;
···
 
 	if (apqi > matrix_mdev->matrix.aqm_max) {
 		ret = -ENODEV;
+		goto done;
+	}
+
+	if (test_bit_inv(apqi, matrix_mdev->matrix.aqm)) {
+		ret = count;
 		goto done;
 	}
 
···
 		goto done;
 	}
 
+	if (!test_bit_inv(apqi, matrix_mdev->matrix.aqm)) {
+		ret = count;
+		goto done;
+	}
+
 	clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
 	vfio_ap_mdev_hot_unplug_domain(matrix_mdev, apqi);
 	ret = count;
···
 
 	if (id > matrix_mdev->matrix.adm_max) {
 		ret = -ENODEV;
+		goto done;
+	}
+
+	if (test_bit_inv(id, matrix_mdev->matrix.adm)) {
+		ret = count;
 		goto done;
 	}
 
···
 
 	if (domid > matrix_mdev->matrix.adm_max) {
 		ret = -ENODEV;
+		goto done;
+	}
+
+	if (!test_bit_inv(domid, matrix_mdev->matrix.adm)) {
+		ret = count;
 		goto done;
 	}