Merge remote-tracking branch 'mkp-scsi/4.7/scsi-fixes' into fixes

diff --git a/Documentation/scsi/scsi_eh.txt b/Documentation/scsi/scsi_eh.txt
index 8638f61c8c9db70d767302497d417be6c9a0a030..37eca00796eeebf805afbbf1504753c1a0febec0 100644 (file)
--- 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
 
 

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 61dc7a99e89a05e64395d1186913685667c8afdb..c6f0174589581e3ac4e07dd791eb6c1604eca219 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -606,7 +606,7 @@ void ata_scsi_error(struct Scsi_Host *host)
        ata_scsi_port_error_handler(host, ap);
 
        /* finish or retry handled scmd's and clean up */
-       WARN_ON(host->host_failed || !list_empty(&eh_work_q));
+       WARN_ON(!list_empty(&eh_work_q));
 
        DPRINTK("EXIT\n");
 }

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index d4c285688ce98b8222dcc778ee646f6581e48df3..3ddc85e6efd65c845fa3a306c832ad2b1a48ac1d 100644 (file)
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -1122,7 +1122,7 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
                } else {
                        struct scsi_cmnd *SCp;
 
-                       SCp = scsi_host_find_tag(SDp->host, SCSI_NO_TAG);
+                       SCp = SDp->current_cmnd;
                        if(unlikely(SCp == NULL)) {
                                sdev_printk(KERN_ERR, SDp,
                                        "no saved request for untagged cmd\n");
@@ -1826,7 +1826,7 @@ NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)
                       slot->tag, slot);
        } else {
                slot->tag = SCSI_NO_TAG;
-               /* must populate current_cmnd for scsi_host_find_tag to work */
+               /* save current command for reselection */
                SCp->device->current_cmnd = SCp;
        }
        /* sanity check: some of the commands generated by the mid-layer

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index a8b610eaa0caa48bb83a36ccb0c514f6dc217d2d..106a6adbd6f12d0a86906239345ec3423eab88cf 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1128,7 +1128,6 @@ static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn)
  */
 void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
 {
-       scmd->device->host->host_failed--;
        scmd->eh_eflags = 0;
        list_move_tail(&scmd->eh_entry, done_q);
 }
@@ -2227,6 +2226,9 @@ int scsi_error_handler(void *data)
                else
                        scsi_unjam_host(shost);
 
+               /* All scmds have been handled */
+               shost->host_failed = 0;
+
                /*
                 * Note - if the above fails completely, the action is to take
                 * individual devices offline and flush the queue of any