[PATCH] Input: alps - Propagate alps_passthrough_mode_v2() errors in alps_poll()

[Wentao Liang]

Add error handling to propagate alps_passthrough_mode_v2() failures
to the caller. When alps_passthrough_mode_v2() fails, immediately
return -1 to stop further processing and maintain consistent error
reporting.

Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/input/mouse/alps.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 0728b5c08f02..557de3d0fce6 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -1994,14 +1994,16 @@ static int alps_poll(struct psmouse *psmouse)
 	unsigned char buf[sizeof(psmouse->packet)];
 	bool poll_failed;
 
-	if (priv->flags & ALPS_PASS)
-		alps_passthrough_mode_v2(psmouse, true);
+	if ((priv->flags & ALPS_PASS) &&
+		alps_passthrough_mode_v2(psmouse, true))
+		return -1;
 
 	poll_failed = ps2_command(&psmouse->ps2dev, buf,
 				  PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
 
-	if (priv->flags & ALPS_PASS)
-		alps_passthrough_mode_v2(psmouse, false);
+	if ((priv->flags & ALPS_PASS) &&
+		alps_passthrough_mode_v2(psmouse, false))
+		return -1;
 
 	if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
 		return -1;
-- 
2.42.0.windows.2