71 lines
3.2 KiB
Diff
71 lines
3.2 KiB
Diff
|
From 89778ba335e302a450932ce5b703c1ee6216e949 Mon Sep 17 00:00:00 2001
|
||
|
|
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
|
||
|
|
Date: Tue, 6 Dec 2016 00:39:33 +0100
|
||
|
|
Subject: [PATCH] usb: core: usbport: Use proper LED API to fix potential crash
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
Calling brightness_set manually isn't safe as some LED drivers don't
|
||
|
|
implement this callback. The best idea is to just use a proper helper
|
||
|
|
which will fallback to the brightness_set_blocking callback if needed.
|
||
|
|
|
||
|
|
This fixes:
|
||
|
|
[ 1461.761528] Unable to handle kernel NULL pointer dereference at virtual address 00000000
|
||
|
|
(...)
|
||
|
|
[ 1462.117049] Backtrace:
|
||
|
|
[ 1462.119521] [<bf228164>] (usbport_trig_port_store [ledtrig_usbport]) from [<c023f758>] (dev_attr_store+0x20/0x2c)
|
||
|
|
[ 1462.129826] r7:dcabc7c0 r6:dee0ff80 r5:00000002 r4:bf228164
|
||
|
|
[ 1462.135511] [<c023f738>] (dev_attr_store) from [<c0169310>] (sysfs_kf_write+0x48/0x4c)
|
||
|
|
[ 1462.143459] r5:00000002 r4:c023f738
|
||
|
|
[ 1462.147049] [<c01692c8>] (sysfs_kf_write) from [<c0168ab8>] (kernfs_fop_write+0xf8/0x1f8)
|
||
|
|
[ 1462.155258] r5:00000002 r4:df4a1000
|
||
|
|
[ 1462.158850] [<c01689c0>] (kernfs_fop_write) from [<c0100c78>] (__vfs_write+0x34/0x120)
|
||
|
|
[ 1462.166800] r10:00000000 r9:dee0e000 r8:c000fc24 r7:00000002 r6:dee0ff80 r5:c01689c0
|
||
|
|
[ 1462.174660] r4:df727a80
|
||
|
|
[ 1462.177204] [<c0100c44>] (__vfs_write) from [<c0101ae4>] (vfs_write+0xac/0x170)
|
||
|
|
[ 1462.184543] r9:dee0e000 r8:c000fc24 r7:dee0ff80 r6:b6f092d0 r5:df727a80 r4:00000002
|
||
|
|
[ 1462.192319] [<c0101a38>] (vfs_write) from [<c01028dc>] (SyS_write+0x4c/0xa8)
|
||
|
|
[ 1462.199396] r9:dee0e000 r8:c000fc24 r7:00000002 r6:b6f092d0 r5:df727a80 r4:df727a80
|
||
|
|
[ 1462.207174] [<c0102890>] (SyS_write) from [<c000fa60>] (ret_fast_syscall+0x0/0x3c)
|
||
|
|
[ 1462.214774] r7:00000004 r6:ffffffff r5:00000000 r4:00000000
|
||
|
|
[ 1462.220456] Code: bad PC value
|
||
|
|
[ 1462.223560] ---[ end trace 676638a3a12c7a56 ]---
|
||
|
|
|
||
|
|
Reported-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
|
||
|
|
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
|
||
|
|
Fixes: 0f247626cbb ("usb: core: Introduce a USB port LED trigger")
|
||
|
|
Cc: stable@vger.kernel.org # 4.9+
|
||
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
||
|
|
---
|
||
|
|
drivers/usb/core/ledtrig-usbport.c | 7 +++----
|
||
|
|
1 file changed, 3 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/usb/core/ledtrig-usbport.c
|
||
|
|
+++ b/drivers/usb/core/ledtrig-usbport.c
|
||
|
|
@@ -74,8 +74,7 @@ static void usbport_trig_update_count(st
|
||
|
|
|
||
|
|
usbport_data->count = 0;
|
||
|
|
usb_for_each_dev(usbport_data, usbport_trig_usb_dev_check);
|
||
|
|
- led_cdev->brightness_set(led_cdev,
|
||
|
|
- usbport_data->count ? LED_FULL : LED_OFF);
|
||
|
|
+ led_set_brightness(led_cdev, usbport_data->count ? LED_FULL : LED_OFF);
|
||
|
|
}
|
||
|
|
|
||
|
|
/***************************************
|
||
|
|
@@ -228,12 +227,12 @@ static int usbport_trig_notify(struct no
|
||
|
|
case USB_DEVICE_ADD:
|
||
|
|
usbport_trig_add_usb_dev_ports(usb_dev, usbport_data);
|
||
|
|
if (observed && usbport_data->count++ == 0)
|
||
|
|
- led_cdev->brightness_set(led_cdev, LED_FULL);
|
||
|
|
+ led_set_brightness(led_cdev, LED_FULL);
|
||
|
|
return NOTIFY_OK;
|
||
|
|
case USB_DEVICE_REMOVE:
|
||
|
|
usbport_trig_remove_usb_dev_ports(usbport_data, usb_dev);
|
||
|
|
if (observed && --usbport_data->count == 0)
|
||
|
|
- led_cdev->brightness_set(led_cdev, LED_OFF);
|
||
|
|
+ led_set_brightness(led_cdev, LED_OFF);
|
||
|
|
return NOTIFY_OK;
|
||
|
|
}
|
||
|
|
|