[PATCH v2] input: raspberrypi-ts: Fix refcount leak in rpi_ts_probe

Miaoqian Lin
2022-12-23T07:47:37Z

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: 0b9f28fed3f7 ("Input: add official Raspberry Pi's touchscreen driver")
Fixes: 3b8ddff780b7 ("input: raspberrypi-ts: Release firmware handle when not needed")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
changes in v2:
- use devm_rpi_firmware_get().
- remove rpi_firmware_put().
---
drivers/input/touchscreen/raspberrypi-ts.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c
index 5000f5fd9ec3..45c575df994e 100644
--- a/drivers/input/touchscreen/raspberrypi-ts.c
+++ b/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;
--
2.25.1