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ARM: Ensure correct might_sleep() check in pagefault path

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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2009-09-20 12:52:19 +01:00
parent b42c6344b0
commit bf4569922b
1 changed files with 7 additions and 0 deletions
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7
arch/arm/mm/fault.c
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@ -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);