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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2016-06-18 21:59:01 +0300
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2016-06-18 21:59:01 +0300
commit951d77fd5a541d68eeb7372e72cd4757e3058517 (patch)
tree74ddfe541cc01e61dbcaf946b604c01863637c65 /Documentation/scsi
parent27ea13e6186c1a5bd0fa2b0d6f854d60ca4ca4c9 (diff)
parent8beb330044d0d1878c7b92290e91c0b889e92633 (diff)
downloadlinux-951d77fd5a541d68eeb7372e72cd4757e3058517.tar.xz
Merge remote-tracking branch 'mkp-scsi/4.7/scsi-fixes' into fixes
Diffstat (limited to 'Documentation/scsi')
-rw-r--r--Documentation/scsi/scsi_eh.txt8
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/scsi/scsi_eh.txt b/Documentation/scsi/scsi_eh.txt
index 8638f61c8c9d..37eca00796ee 100644
--- a/Documentation/scsi/scsi_eh.txt
+++ b/Documentation/scsi/scsi_eh.txt
@@ -263,19 +263,23 @@ scmd->allowed.
3. scmd recovered
ACTION: scsi_eh_finish_cmd() is invoked to EH-finish scmd
- - shost->host_failed--
- clear scmd->eh_eflags
- scsi_setup_cmd_retry()
- move from local eh_work_q to local eh_done_q
LOCKING: none
+ CONCURRENCY: at most one thread per separate eh_work_q to
+ keep queue manipulation lockless
4. EH completes
ACTION: scsi_eh_flush_done_q() retries scmds or notifies upper
- layer of failure.
+ layer of failure. May be called concurrently but must have
+ a no more than one thread per separate eh_work_q to
+ manipulate the queue locklessly
- scmd is removed from eh_done_q and scmd->eh_entry is cleared
- if retry is necessary, scmd is requeued using
scsi_queue_insert()
- otherwise, scsi_finish_command() is invoked for scmd
+ - zero shost->host_failed
LOCKING: queue or finish function performs appropriate locking