tree 7333fed46331fc756cfde7dfd58a1127de97955b
parent 06bb5219118fb098f4b0c7dcb484b28a52bf1c14
author Yonghua Zheng <younghua.zheng@gmail.com> 1377531515 +0800
committer Jiri Kosina <jkosina@suse.cz> 1377546024 +0200

HID: hidraw: Add spinlock in struct hidraw to protect list

It is unsafe to call list_for_each_entry in hidraw_report_event to
traverse each hidraw_list node without a lock protection, the list
could be modified if someone calls hidraw_release and list_del to
remove itself from the list, this can cause hidraw_report_event
to touch a deleted list struct and panic.

To prevent this, introduce a spinlock in struct hidraw to protect
list from concurrent access.

Signed-off-by: Yonghua Zheng <younghua.zheng@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>