ARM: Ensure correct might_sleep() check in pagefault path (bf456992) · Commits · e / devices / android_kernel_fairphone_FP4

arch/arm/mm/fault.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -271,6 +271,13 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
		if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
		goto no_context;
		down_read(&mm->mmap_sem);
		} else {
		/*
		* The above down_read_trylock() might have succeeded in
		* which case, we'll have missed the might_sleep() from
		* down_read()
		*/
		might_sleep();
		}

		fault = __do_page_fault(mm, addr, fsr, tsk);