Misc: Add possibility to remove misc devices during suspend/resume

Make it possible to unregister a misc device object in a safe way during a
suspend/resume cycle.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Michael Buesch <mb@bu3sch.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <greg@kroah.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index dff9ea32606a..24b30b9b4f8a 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -43,7 +43,15 @@ struct miscdevice  {
 };
 
 extern int misc_register(struct miscdevice * misc);
-extern int misc_deregister(struct miscdevice * misc);
+extern int __misc_deregister(struct miscdevice *misc, bool suspended);
+static inline int misc_deregister(struct miscdevice *misc)
+{
+        return __misc_deregister(misc, false);
+}
+static inline int misc_deregister_suspended(struct miscdevice *misc)
+{
+        return __misc_deregister(misc, true);
+}
 
 #define MODULE_ALIAS_MISCDEV(minor)                             \
         MODULE_ALIAS("char-major-" __stringify(MISC_MAJOR)      \