HID: hid-sony.c: Use devm_ api to simplify sc->output_report_dmabuf

HID: hid-sony.c: Use devm_ api to simplify sc->output_report_dmabuf

Using devm_ calls, the resources of the Sony game devices's features are
tied to the main device handle, making it easier to handle errors and
teardown inside the device driver. Altogether, this reduces complexity
of the driver source.
Signed-off-by: Hanno Zulla <kontakt@hanno.de>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-sony.c

@@ -2202,16 +2202,20 @@ static int sony_allocate_output_report(struct sony_sc *sc)
 	if ((sc->quirks & SIXAXIS_CONTROLLER) ||
 			(sc->quirks & NAVIGATION_CONTROLLER))
 		sc->output_report_dmabuf =
-			kmalloc(sizeof(union sixaxis_output_report_01),
+			devm_kmalloc(&sc->hdev->dev,
+				sizeof(union sixaxis_output_report_01),
 				GFP_KERNEL);
 	else if (sc->quirks & DUALSHOCK4_CONTROLLER_BT)
-		sc->output_report_dmabuf = kmalloc(DS4_OUTPUT_REPORT_0x11_SIZE,
+		sc->output_report_dmabuf = devm_kmalloc(&sc->hdev->dev,
+						DS4_OUTPUT_REPORT_0x11_SIZE,
 						GFP_KERNEL);
 	else if (sc->quirks & (DUALSHOCK4_CONTROLLER_USB | DUALSHOCK4_DONGLE))
-		sc->output_report_dmabuf = kmalloc(DS4_OUTPUT_REPORT_0x05_SIZE,
+		sc->output_report_dmabuf = devm_kmalloc(&sc->hdev->dev,
+						DS4_OUTPUT_REPORT_0x05_SIZE,
 						GFP_KERNEL);
 	else if (sc->quirks & MOTION_CONTROLLER)
-		sc->output_report_dmabuf = kmalloc(MOTION_REPORT_0x02_SIZE,
+		sc->output_report_dmabuf = devm_kmalloc(&sc->hdev->dev,
+						MOTION_REPORT_0x02_SIZE,
 						GFP_KERNEL);
 	else
 		return 0;
@@ -2791,7 +2795,6 @@ static int sony_input_configured(struct hid_device *hdev,
 	if (sc->hw_version)
 		device_remove_file(&sc->hdev->dev, &dev_attr_hardware_version);
 	sony_cancel_work_sync(sc);
-	kfree(sc->output_report_dmabuf);
 	sony_remove_dev_list(sc);
 	sony_release_device_id(sc);
 	hid_hw_stop(hdev);
@@ -2879,8 +2882,6 @@ static void sony_remove(struct hid_device *hdev)
 
 	sony_cancel_work_sync(sc);
 
-	kfree(sc->output_report_dmabuf);
-
 	sony_remove_dev_list(sc);
 
 	sony_release_device_id(sc);