cdrom: protect cdrom_device_info list by mutex
This patch protects the list of cdrom_device_info by cdrom_mutex
when the file in /proc/sys/dev/cdrom/ is written.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index fbcf4b3..326ef1b 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -3427,6 +3427,7 @@
{
struct cdrom_device_info *cdi;
+ mutex_lock(&cdrom_mutex);
for (cdi = topCdromPtr; cdi != NULL; cdi = cdi->next) {
if (autoclose && CDROM_CAN(CDC_CLOSE_TRAY))
cdi->options |= CDO_AUTO_CLOSE;
@@ -3445,6 +3446,7 @@
else
cdi->options &= ~CDO_CHECK_TYPE;
}
+ mutex_unlock(&cdrom_mutex);
}
static int cdrom_sysctl_handler(ctl_table *ctl, int write, struct file * filp,
