linux-kernel - [PATCH AUTOSEL 4.19 14/27] auxdisplay: panel: need to delete scan_timer when misc_register fails in panel

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Date:   Tue, 20 Aug 2019 09:42:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     zhengbin <zhengbin13@...wei.com>, Hulk Robot <hulkci@...wei.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 14/27] auxdisplay: panel: need to delete scan_timer when misc_register fails in panel_attach

From: zhengbin <zhengbin13@...wei.com>

[ Upstream commit b33d567560c1aadf3033290d74d4fd67af47aa61 ]

In panel_attach, if misc_register fails, we need to delete scan_timer,
which was setup in keypad_init->init_scan_timer.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: zhengbin <zhengbin13@...wei.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/auxdisplay/panel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
index 3b25a643058c9..0b8e2a7d6e934 100644
--- a/drivers/auxdisplay/panel.c
+++ b/drivers/auxdisplay/panel.c
@@ -1618,6 +1618,8 @@ static void panel_attach(struct parport *port)
 	return;
 
 err_lcd_unreg:
+	if (scan_timer.function)
+		del_timer_sync(&scan_timer);
 	if (lcd.enabled)
 		charlcd_unregister(lcd.charlcd);
 err_unreg_device:
-- 
2.20.1