[SCSI] libsas: modify error handler to use scsi_eh_* functions

This patch adds an EH done queue to sas_ha, converts the error handling
strategy function and the sas_scsi_task_done functions in libsas to use
the scsi_eh_* commands for error'd commands, and adds checks for the
INITIATOR_ABORTED flag so that we do the right thing if a sas_task has
been aborted by the initiator.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index c836a23..a2b479a 100644 (file)
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -112,6 +112,8 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
                }
        }
 
+       INIT_LIST_HEAD(&sas_ha->eh_done_q);
+
        return 0;
 
 Undo_ports:

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index e46e793..6a97b07 100644 (file)
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -29,6 +29,7 @@
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_sas.h>
 #include "../scsi_sas_internal.h"
@@ -46,6 +47,7 @@ static void sas_scsi_task_done(struct sas_task *task)
 {
        struct task_status_struct *ts = &task->task_status;
        struct scsi_cmnd *sc = task->uldd_task;
+       struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
        unsigned ts_flags = task->task_state_flags;
        int hs = 0, stat = 0;
 
@@ -116,7 +118,7 @@ static void sas_scsi_task_done(struct sas_task *task)
        sas_free_task(task);
        /* This is very ugly but this is how SCSI Core works. */
        if (ts_flags & SAS_TASK_STATE_ABORTED)
-               scsi_finish_command(sc);
+               scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
        else
                sc->scsi_done(sc);
 }
@@ -307,6 +309,15 @@ static enum task_disposition sas_scsi_find_task(struct sas_task *task)
                spin_unlock_irqrestore(&core->task_queue_lock, flags);
        }
 
+       spin_lock_irqsave(&task->task_state_lock, flags);
+       if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
+               spin_unlock_irqrestore(&task->task_state_lock, flags);
+               SAS_DPRINTK("%s: task 0x%p already aborted\n",
+                           __FUNCTION__, task);
+               return TASK_IS_ABORTED;
+       }
+       spin_unlock_irqrestore(&task->task_state_lock, flags);
+
        for (i = 0; i < 5; i++) {
                SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
                res = si->dft->lldd_abort_task(task);
@@ -409,13 +420,16 @@ Again:
        SAS_DPRINTK("going over list...\n");
        list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
                struct sas_task *task = TO_SAS_TASK(cmd);
+               list_del_init(&cmd->eh_entry);
 
+               if (!task) {
+                       SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
+                       continue;
+               }
                SAS_DPRINTK("trying to find task 0x%p\n", task);
-               list_del_init(&cmd->eh_entry);
                res = sas_scsi_find_task(task);
 
                cmd->eh_eflags = 0;
-               shost->host_failed--;
 
                switch (res) {
                case TASK_IS_DONE:
@@ -491,6 +505,7 @@ Again:
                }
        }
 out:
+       scsi_eh_flush_done_q(&ha->eh_done_q);
        SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
        return;
 clear_q:
@@ -508,12 +523,18 @@ enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
        unsigned long flags;
 
        if (!task) {
-               SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
+               SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n",
                            cmd, task);
                return EH_HANDLED;
        }
 
        spin_lock_irqsave(&task->task_state_lock, flags);
+       if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
+               spin_unlock_irqrestore(&task->task_state_lock, flags);
+               SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: "
+                           "EH_NOT_HANDLED\n", cmd, task);
+               return EH_NOT_HANDLED;
+       }
        if (task->task_state_flags & SAS_TASK_STATE_DONE) {
                spin_unlock_irqrestore(&task->task_state_lock, flags);
                SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",

diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 9582e84..7bf2e8b 100644 (file)
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -338,6 +338,8 @@ struct sas_ha_struct {
        void (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);
 
        void *lldd_ha;            /* not touched by sas class code */
+
+       struct list_head eh_done_q;
 };
 
 #define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
@@ -530,9 +532,10 @@ struct sas_task {
 
 
 
-#define SAS_TASK_STATE_PENDING  1
-#define SAS_TASK_STATE_DONE     2
-#define SAS_TASK_STATE_ABORTED  4
+#define SAS_TASK_STATE_PENDING      1
+#define SAS_TASK_STATE_DONE         2
+#define SAS_TASK_STATE_ABORTED      4
+#define SAS_TASK_INITIATOR_ABORTED  8
 
 static inline struct sas_task *sas_alloc_task(gfp_t flags)
 {