tree 9f65ed8525d1008e7ac829d36fc9a6f5a903e5fc
parent 77d89366bc9220195e87ba33a3dd8048990631f3
author Sven Schnelle <svens@linux.ibm.com> 1600152830 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1604570931 +0100

s390/stp: add locking to sysfs functions

commit b3bd02495cb339124f13135d51940cf48d83e5cb upstream.

The sysfs function might race with stp_work_fn. To prevent that,
add the required locking. Another issue is that the sysfs functions
are checking the stp_online flag, but this flag just holds the user
setting whether STP is enabled. Add a flag to clock_sync_flag whether
stp_info holds valid data and use that instead.

Cc: stable@vger.kernel.org
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>