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| author |   James Bottomley <James.Bottomley@HansenPartnership.com> | 2016-06-18 11:59:01 -0700 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2016-06-18 11:59:01 -0700 |
| commit | 951d77fd5a541d68eeb7372e72cd4757e3058517 (patch) | |
| tree | 74ddfe541cc01e61dbcaf946b604c01863637c65 /Documentation/scsi | |
| parent | Merge remote-tracking branch 'mkp-scsi/4.7/scsi-fixes' into fixes (diff) | |
| parent | 53c700: fix BUG on untagged commands (diff) | |
| download | linux-dev-951d77fd5a541d68eeb7372e72cd4757e3058517.tar.xz linux-dev-951d77fd5a541d68eeb7372e72cd4757e3058517.zip | |
Merge remote-tracking branch 'mkp-scsi/4.7/scsi-fixes' into fixes
Diffstat (limited to 'Documentation/scsi')
| -rw-r--r-- | Documentation/scsi/scsi_eh.txt | 8 |
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 |