Input: raspberrypi-ts - fix refcount leak in rpi_ts_probe

[ Upstream commit 5bca368 ]

rpi_firmware_get() take reference, we need to release it in error paths
as well. Use devm_rpi_firmware_get() helper to handling the resources.
Also remove the existing rpi_firmware_put().

Fixes: 0b9f28f ("Input: add official Raspberry Pi's touchscreen driver")
Fixes: 3b8ddff ("input: raspberrypi-ts: Release firmware handle when not needed")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20221223074657.810346-1-linmq006@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/input/touchscreen/raspberrypi-ts.c

@@ -134,7 +134,7 @@ static int rpi_ts_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	fw = rpi_firmware_get(fw_node);
+	fw = devm_rpi_firmware_get(&pdev->dev, fw_node);
 	of_node_put(fw_node);
 	if (!fw)
 		return -EPROBE_DEFER;
@@ -160,7 +160,6 @@ static int rpi_ts_probe(struct platform_device *pdev)
 	touchbuf = (u32)ts->fw_regs_phys;
 	error = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
 				      &touchbuf, sizeof(touchbuf));
-	rpi_firmware_put(fw);
 	if (error || touchbuf != 0) {
 		dev_warn(dev, "Failed to set touchbuf, %d\n", error);
 		return error;