git: c120ef9e141e - stable/12 - Do not exit ctl_be_block_worker() prematurely.

[Alexander Motin]

The branch stable/12 has been updated by mav:

URL: https://cgit.FreeBSD.org/src/commit/?id=c120ef9e141e3c8b9b6025aa947dcc7c693ee2b8

commit c120ef9e141e3c8b9b6025aa947dcc7c693ee2b8
Author:     Alexander Motin <mav at FreeBSD.org>
AuthorDate: 2021-03-06 03:39:52 +0000
Commit:     Alexander Motin <mav at FreeBSD.org>
CommitDate: 2021-03-09 02:47:53 +0000

    Do not exit ctl_be_block_worker() prematurely.
    
    Return while there are any I/Os in a queue may result in them stuck
    indefinitely, since there is only one taskqueue task for all of them.
    I think I've reproduced this by switching ha_role to secondary under
    heavy load.
    
    MFC after:      3 days
    
    (cherry picked from commit 6ed39db2573bb808ac2c206cd6c831f0be86219c)
---
 sys/cam/ctl/ctl_backend_block.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sys/cam/ctl/ctl_backend_block.c b/sys/cam/ctl/ctl_backend_block.c
index 85787d35eb6c..d876691a9fa1 100644
--- a/sys/cam/ctl/ctl_backend_block.c
+++ b/sys/cam/ctl/ctl_backend_block.c
@@ -1696,7 +1696,7 @@ ctl_be_block_worker(void *context, int pending)
 			if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
 				ctl_set_busy(&io->scsiio);
 				ctl_complete_beio(beio);
-				return;
+				continue;
 			}
 			be_lun->dispatch(be_lun, beio);
 			continue;
@@ -1710,7 +1710,7 @@ ctl_be_block_worker(void *context, int pending)
 			if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
 				ctl_set_busy(&io->scsiio);
 				ctl_config_write_done(io);
-				return;
+				continue;
 			}
 			ctl_be_block_cw_dispatch(be_lun, io);
 			continue;
@@ -1724,7 +1724,7 @@ ctl_be_block_worker(void *context, int pending)
 			if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
 				ctl_set_busy(&io->scsiio);
 				ctl_config_read_done(io);
-				return;
+				continue;
 			}
 			ctl_be_block_cr_dispatch(be_lun, io);
 			continue;
@@ -1738,7 +1738,7 @@ ctl_be_block_worker(void *context, int pending)
 			if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
 				ctl_set_busy(&io->scsiio);
 				ctl_data_submit_done(io);
-				return;
+				continue;
 			}
 			ctl_be_block_dispatch(be_lun, io);
 			continue;