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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-07-04 15:19:21 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-07-04 15:19:21 (GMT)
commitc318a821b9828ef3be97d5d896d146e7daa43c86 (patch)
tree7ed40911ffebcbabf87ec4be692f6fb154053687 /Documentation
parent322832f2f19e04c866a0ce4bdac8cff8e695f2b3 (diff)
parenta99cde438de0c4c0cecc1d1af1a55a75b10bfdef (diff)
downloadlinux-c318a821b9828ef3be97d5d896d146e7daa43c86.tar.xz
Merge 4.7-rc6 into usb-next
We want the USB fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-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 8638f61..37eca00 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