dm crypt: add cond_resched() to dmcrypt_write()

mainline inclusion
from mainline-v6.3-rc4
commit fb294b1c
category: bugfix
bugzilla: 188393, https://gitee.com/openeuler/kernel/issues/I6JPSH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb294b1c0ba982144ca467a75e7d01ff26304e2b

----------------------------------------

The loop in dmcrypt_write may be running for unbounded amount of time,
thus we need cond_resched() in it.

This commit fixes the following warning:

[ 3391.153255][   C12] watchdog: BUG: soft lockup - CPU#12 stuck for 23s! [dmcrypt_write/2:2897]
...
[ 3391.387210][   C12] Call trace:
[ 3391.390338][   C12]  blk_attempt_bio_merge.part.6+0x38/0x158
[ 3391.395970][   C12]  blk_attempt_plug_merge+0xc0/0x1b0
[ 3391.401085][   C12]  blk_mq_submit_bio+0x398/0x550
[ 3391.405856][   C12]  submit_bio_noacct+0x308/0x380
[ 3391.410630][   C12]  dmcrypt_write+0x1e4/0x208 [dm_crypt]
[ 3391.416005][   C12]  kthread+0x130/0x138
[ 3391.419911][   C12]  ret_from_fork+0x10/0x18
Reported-by: Nyangerkun <yangerkun@huawei.com>
Fixes: dc267621 ("dm crypt: offload writes to thread")
Cc: stable@vger.kernel.org
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NMike Snitzer <snitzer@kernel.org>
Signed-off-by: Nyangerkun <yangerkun@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Reviewed-by: NYu Kuai <yukuai3@huawei.com>
Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>

drivers/md/dm-crypt.c

@@ -1934,6 +1934,7 @@ static int dmcrypt_write(void *data)
 			io = crypt_io_from_node(rb_first(&write_tree));
 			rb_erase(&io->rb_node, &write_tree);
 			kcryptd_io_write(io);
+			cond_resched();
 		} while (!RB_EMPTY_ROOT(&write_tree));
 		blk_finish_plug(&plug);
 	}