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ARM: 8414/1: __copy_to_user_memcpy: fix mmap semaphore usage 

The mmap semaphore should not be taken when page faults are disabled.
Since pagefault_disable() no longer disables preemption, we now need
to use faulthandler_disabled() in place of in_atomic().

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Nicolas Pitre 2015-08-12 16:45:02 +01:00 committed by Russell King
parent 09edea4f8f
commit 0f64b247e6
1 changed files with 1 additions and 1 deletions
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arch/arm/lib/uaccess_with_memcpy.c
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@ -96,7 +96,7 @@ __copy_to_user_memcpy(void __user *to, const void *from, unsigned long n)
}
/* the mmap semaphore is taken only if not in an atomic context */
atomic = in_atomic();
atomic = faulthandler_disabled();
if (!atomic)
down_read(&current->mm->mmap_sem);