tree 4fd5a65dd1dda67ba8e2c4857bf1c7f5c19edaf8
parent 90140c30a7b8c77e8872a389d48678d78e58789f
author Russell King <rmk+kernel@arm.linux.org.uk> 1254134511 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1254157581 +0100

ARM: Ensure do_cache_op takes mmap_sem

do_cache_op() uses find_vma() to validate its arguments without holding
any locking.  This means that the VMA could vanish beneath us.  Fix
this by taking a read lock on mmap_sem.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>