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Subject[PATCH 3/5] 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>
Cc: Jens Axboe <axboe@kernel.dk>
---
drivers/cdrom/cdrom.c | 2 ++
1 file changed, 2 insertions(+)

Index: 2.6-git/drivers/cdrom/cdrom.c
===================================================================
--- 2.6-git.orig/drivers/cdrom/cdrom.c
+++ 2.6-git/drivers/cdrom/cdrom.c
@@ -3427,6 +3427,7 @@ static void cdrom_update_settings(void)
{
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 @@ static void cdrom_update_settings(void)
else
cdi->options &= ~CDO_CHECK_TYPE;
}
+ mutex_unlock(&cdrom_mutex);
}

static int cdrom_sysctl_handler(ctl_table *ctl, int write, struct file * filp,

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