Userland programs may read/write PPS parameters at same time and these
operations may corrupt PPS data.
Signed-off-by: NRodolfo Giometti <giometti@linux.it>
Tested-by: NReg Clemens <clemens@dwf.com>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>