[PATCH 01/11] drbd_nl: dont allow detating to be inttrupted in waiting D_DETACHING to DISKLESS

["zhengbing.huang" <zhengbing.huang@easystack.cn>]

From: Dongsheng Yang <dongsheng.yang@easystack.cn>

In our network failure and drbd down testing, we found warning in dmesg and drbd down process into D state:

"kernel: drbd /unregistered/ramtest3/0 drbd103: ASSERTION device->disk_state[NOW] == D_FAILED || device->disk_state[NOW] == D_DETACHING FAILED in go_diskless"

the problem is the wait_event is inttruptable, it could be intrupted by signal and call drbd_cleanup_device before go_diskless()

Signed-off-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
---
 drbd/drbd_nl.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drbd/drbd_nl.c b/drbd/drbd_nl.c
index 530334e61..7b4539431 100644
--- a/drbd/drbd_nl.c
+++ b/drbd/drbd_nl.c
@@ -3676,7 +3676,7 @@ static int adm_detach(struct drbd_device *device, bool force, bool intentional_d
 		      const char *tag, struct sk_buff *reply_skb)
 {
 	const char *err_str = NULL;
-	int ret, retcode;
+	int retcode;
 
 	device->device_conf.intentional_diskless = intentional_diskless;
 	if (force) {
@@ -3692,19 +3692,16 @@ static int adm_detach(struct drbd_device *device, bool force, bool intentional_d
 			CS_VERBOSE | CS_WAIT_COMPLETE | CS_SERIALIZE, tag, &err_str));
 	/* D_DETACHING will transition to DISKLESS. */
 	drbd_resume_io(device);
-	ret = wait_event_interruptible(device->misc_wait,
-			get_disk_state(device) != D_DETACHING);
+	wait_event(device->misc_wait, get_disk_state(device) != D_DETACHING);
 	if (retcode >= SS_SUCCESS) {
 		/* wait for completion of drbd_ldev_destroy() */
-		wait_event_interruptible(device->misc_wait, !test_bit(GOING_DISKLESS, &device->flags));
+		wait_event(device->misc_wait, !test_bit(GOING_DISKLESS, &device->flags));
 		drbd_cleanup_device(device);
 	}
 	else
 		device->device_conf.intentional_diskless = false;
 	if (retcode == SS_IS_DISKLESS)
 		retcode = SS_NOTHING_TO_DO;
-	if (ret)
-		retcode = ERR_INTR;
 out:
 	if (err_str) {
 		drbd_msg_put_info(reply_skb, err_str);
-- 
2.27.0