Sylvain Chouleur 21b3ddd39f efi: Don't use spinlocks for efi vars ... All efivars operations are protected by a spinlock which prevents interruptions and preemption. This is too restricted, we just need a lock preventing concurrency. The idea is to use a semaphore of count 1 and to have two ways of locking, depending on the context: - In interrupt context, we call down_trylock(), if it fails we return an error - In normal context, we call down_interruptible() We don't use a mutex here because the mutex_trylock() function must not be called from interrupt context, whereas the down_trylock() can. Signed-off-by: Sylvain Chouleur <sylvain.chouleur@intel.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Sylvain Chouleur <sylvain.chouleur@gmail.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>		2016-09-09 16:08:42 +01:00
..
file.c	efivarfs: Make efivarfs_file_ioctl() static	2016-05-07 07:06:13 +02:00
inode.c	efi: Don't use spinlocks for efi vars	2016-09-09 16:08:42 +01:00
internal.h	efi: Make efivarfs entries immutable by default	2016-02-10 16:25:52 +00:00
Kconfig	fs: Make efivarfs a pseudo filesystem, built by default with EFI	2015-01-05 14:15:58 +00:00
Makefile	efivarfs: Move to fs/efivarfs	2013-04-17 13:25:09 +01:00
super.c	efi: Don't use spinlocks for efi vars	2016-09-09 16:08:42 +01:00