From: Ahmed S. Darwish a.darwish@linutronix.de
commit 15b81ce5abdc4b502aa31dff2d415b79d2349d2f upstream.
For optimized block readers not holding a mutex, the "number of sectors" 64-bit value is protected from tearing on 32-bit architectures by a sequence counter.
Disable preemption before entering that sequence counter's write side critical section. Otherwise, the read side can preempt the write side section and spin for the entire scheduler tick. If the reader belongs to a real-time scheduling class, it can spin forever and the kernel will livelock.
Fixes: c83f6bf98dc1 ("block: add partition resize function to blkpg ioctl") Cc: stable@vger.kernel.org Signed-off-by: Ahmed S. Darwish a.darwish@linutronix.de Reviewed-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- block/blk.h | 2 ++ 1 file changed, 2 insertions(+)
--- a/block/blk.h +++ b/block/blk.h @@ -470,9 +470,11 @@ static inline sector_t part_nr_sects_rea static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) { #if BITS_PER_LONG==32 && defined(CONFIG_SMP) + preempt_disable(); write_seqcount_begin(&part->nr_sects_seq); part->nr_sects = size; write_seqcount_end(&part->nr_sects_seq); + preempt_enable(); #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) preempt_disable(); part->nr_sects = size;