From: Sukrut Bellary <sukrut.bellary@xxxxxxxxx>
[ Upstream commit 81b233b8dd72f2d1df3da8bd4bd4f8c5e84937b9 ]
Handle signed error return values returned by simple_write_to_buffer().
In case of an error, return the error code.
Fixes: 3c3d818a9317 ("firmware: arm_scmi: Add core raw transmission support")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Sukrut Bellary <sukrut.bellary@xxxxxxxxx>
Reviewed-by: Cristian Marussi <cristian.marussi@xxxxxxx>
Tested-by: Cristian Marussi <cristian.marussi@xxxxxxx>
Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230718085529.258899-1-sukrut.bellary@xxxxxxxxx
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/firmware/arm_scmi/raw_mode.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/arm_scmi/raw_mode.c b/drivers/firmware/arm_scmi/raw_mode.c
index 6971dcf72fb99..0493aa3c12bf5 100644
--- a/drivers/firmware/arm_scmi/raw_mode.c
+++ b/drivers/firmware/arm_scmi/raw_mode.c
@@ -818,10 +818,13 @@ static ssize_t scmi_dbg_raw_mode_common_write(struct file *filp,
* before sending it with a single RAW xfer.
*/
if (rd->tx_size < rd->tx_req_size) {
- size_t cnt;
+ ssize_t cnt;
cnt = simple_write_to_buffer(rd->tx.buf, rd->tx.len, ppos,
buf, count);
+ if (cnt < 0)
+ return cnt;
+
rd->tx_size += cnt;
if (cnt < count)
return cnt;
--
2.40.1
