[SCSI] allow sleeping in ->eh_device_reset_handler()

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

17 files changed, 98 insertions, 42 deletions

diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt
index f4a37ee670f2..62f7f76f5de8 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/Documentation/scsi/scsi_mid_low_api.txt
@@ -973,8 +973,7 @@ Details:
  *
  *      Returns SUCCESS if command aborted else FAILED
  *
- *      Locks: struct Scsi_Host::host_lock held (with irqsave) on entry
- *      and assumed to be held on return.
+ *      Locks: None held
  *
  *      Calling context: kernel thread
  *
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index de552486b1c9..fcfddcc8e7ba 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -2615,7 +2615,7 @@ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
 /*
  * Called by scsi stack when something has really gone wrong.
  */
-static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
+static int __sbp2scsi_reset(struct scsi_cmnd *SCpnt)
 {
         struct scsi_id_instance_data *scsi_id =
                 (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0];
@@ -2630,6 +2630,18 @@ static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
         return(SUCCESS);
 }
 
+static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
+{
+        unsigned long flags;
+        int rc;
+
+        spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
+        rc = __sbp2scsi_reset(SCpnt);
+        spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
+
+        return rc;
+}
+
 static const char *sbp2scsi_info (struct Scsi_Host *host)
 {
         return "SCSI emulation for IEEE-1394 SBP-2 Devices";
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 6a5851c51a21..82cd9bc3b024 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -1801,7 +1801,6 @@ int
 mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
 {
         MPT_SCSI_HOST   *hd;
-        spinlock_t      *host_lock = SCpnt->device->host->host_lock;
 
         /* If we can't locate our host adapter structure, return FAILED status.
          */
@@ -1818,7 +1817,6 @@ mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
         printk(KERN_WARNING MYNAM ": %s: >> Attempting target reset! (sc=%p)\n",
                hd->ioc->name, SCpnt);
 
-        spin_unlock_irq(host_lock);
         if (mptscsih_TMHandler(hd, MPI_SCSITASKMGMT_TASKTYPE_TARGET_RESET,
                 SCpnt->device->channel, SCpnt->device->id,
                 0, 0, 5 /* 5 second timeout */)
@@ -1830,12 +1828,10 @@ mptscsih_dev_reset(struct scsi_cmnd * SCpnt)
                                 hd->ioc->name, SCpnt);
                 hd->tmPending = 0;
                 hd->tmState = TM_STATE_NONE;
-                spin_lock_irq(host_lock);
                 return FAILED;
         }
-        spin_lock_irq(host_lock);
-        return SUCCESS;
 
+        return SUCCESS;
 }
 
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 6e4447598495..be7c91d4ae8c 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -636,8 +636,6 @@ zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
         struct Scsi_Host *scsi_host = scpnt->device->host;
 
-        spin_unlock_irq(scsi_host->host_lock);
-
         if (!unit) {
                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
                 retval = SUCCESS;
@@ -680,7 +678,6 @@ zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
                 retval = SUCCESS;
         }
  out:
-        spin_lock_irq(scsi_host->host_lock);
         return retval;
 }
 
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index 88d119f4b970..630b11575230 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -1225,8 +1225,6 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
         }
 
         DO_UNLOCK(flags);
-
-        spin_lock_irq(shpnt->host_lock);
         return ret;
 }
 
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 7fc6c76e519b..31db0edc7cf9 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -1511,17 +1511,17 @@ ahd_linux_dev_reset(Scsi_Cmnd *cmd)
                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
                        cmd->device->lun, cmd);
 #endif
-        ahd_midlayer_entrypoint_lock(ahd, &s);
+        ahd_lock(ahd, &s);
 
         dev = ahd_linux_get_device(ahd, cmd->device->channel, cmd->device->id,
                                    cmd->device->lun, /*alloc*/FALSE);
         if (dev == NULL) {
-                ahd_midlayer_entrypoint_unlock(ahd, &s);
+                ahd_unlock(ahd, &s);
                 kfree(recovery_cmd);
                 return (FAILED);
         }
         if ((scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX)) == NULL) {
-                ahd_midlayer_entrypoint_unlock(ahd, &s);
+                ahd_unlock(ahd, &s);
                 kfree(recovery_cmd);
                 return (FAILED);
         }
@@ -1570,7 +1570,7 @@ ahd_linux_dev_reset(Scsi_Cmnd *cmd)
         spin_lock_irq(&ahd->platform_data->spin_lock);
         ahd_schedule_runq(ahd);
         ahd_linux_run_complete_queue(ahd);
-        ahd_midlayer_entrypoint_unlock(ahd, &s);
+        ahd_unlock(ahd, &s);
         printf("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
         return (retval);
 }
diff --git a/drivers/scsi/aic7xxx_old.c b/drivers/scsi/aic7xxx_old.c
index ee127e8aea55..1e83096bb911 100644
--- a/drivers/scsi/aic7xxx_old.c
+++ b/drivers/scsi/aic7xxx_old.c
@@ -10358,7 +10358,7 @@ aic7xxx_queue(Scsi_Cmnd *cmd, void (*fn)(Scsi_Cmnd *))
  *   Returns an enumerated type that indicates the status of the operation.
  *-F*************************************************************************/
 static int
-aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
+__aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
 {
   struct aic7xxx_host  *p;
   struct aic7xxx_scb   *scb;
@@ -10551,6 +10551,18 @@ aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
     return SUCCESS;
 }
 
+static int
+aic7xxx_bus_device_reset(Scsi_Cmnd *cmd)
+{
+      int rc;
+
+      spin_lock_irq(cmd->device->host->host_lock);
+      rc = __aic7xxx_bus_device_reset(cmd);
+      spin_unlock_irq(cmd->device->host->host_lock);
+
+      return rc;
+}
+
 
 /*+F*************************************************************************
  * Function:
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index d857842bc45b..d89b8eb3cdf3 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -976,9 +976,7 @@ static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
                 return FAILED;
         }
 
-        spin_unlock_irq(hostdata->host->host_lock);
         wait_for_completion(&evt->comp);
-        spin_lock_irq(hostdata->host->host_lock);
 
         /* make sure we got a good response */
         if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index f9c01a13abef..fd8af643feac 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -2916,7 +2916,7 @@ static int ipr_eh_host_reset(struct scsi_cmnd * scsi_cmd)
  * Return value:
  *      SUCCESS / FAILED
  **/
-static int ipr_eh_dev_reset(struct scsi_cmnd * scsi_cmd)
+static int __ipr_eh_dev_reset(struct scsi_cmnd * scsi_cmd)
 {
         struct ipr_cmnd *ipr_cmd;
         struct ipr_ioa_cfg *ioa_cfg;
@@ -2970,6 +2970,17 @@ static int ipr_eh_dev_reset(struct scsi_cmnd * scsi_cmd)
         return (IPR_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS);
 }
 
+static int ipr_eh_dev_reset(struct scsi_cmnd * cmd)
+{
+        int rc;
+
+        spin_lock_irq(cmd->device->host->host_lock);
+        rc = __ipr_eh_dev_reset(cmd);
+        spin_unlock_irq(cmd->device->host->host_lock);
+
+        return rc;
+}
+
 /**
  * ipr_bus_reset_done - Op done function for bus reset.
  * @ipr_cmd:    ipr command struct
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index e9b84f9d8e81..13da26883da3 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -928,7 +928,7 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
 }
 
 static int
-lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
+__lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 {
         struct Scsi_Host *shost = cmnd->device->host;
         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
@@ -1040,6 +1040,16 @@ out:
         return ret;
 }
 
+static int
+lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
+{
+        int rc;
+        spin_lock_irq(cmnd->device->host->host_lock);
+        rc = __lpfc_reset_lun_handler(cmnd);
+        spin_unlock_irq(cmnd->device->host->host_lock);
+        return rc;
+}
+
 /*
  * Note: midlayer calls this function with the host_lock held
  */
diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 8d707b29027d..80b0c40c522b 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -1938,7 +1938,7 @@ megaraid_abort(Scsi_Cmnd *cmd)
 
 
 static int
-megaraid_reset(Scsi_Cmnd *cmd)
+__megaraid_reset(Scsi_Cmnd *cmd)
 {
         adapter_t       *adapter;
         megacmd_t       mc;
@@ -1972,6 +1972,18 @@ megaraid_reset(Scsi_Cmnd *cmd)
         return rval;
 }
 
+static int
+megaraid_reset(Scsi_Cmnd *cmd)
+{
+        adapter = (adapter_t *)cmd->device->host->hostdata;
+        int rc;
+
+        spin_lock_irq(&adapter->lock);
+        rc = __megaraid_reset(cmd);
+        spin_unlock_irq(&adapter->lock);
+
+        return rc;
+}
 
 
 /**
diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index bec4406011aa..057ed45b54b2 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -2726,7 +2726,7 @@ megaraid_abort_handler(struct scsi_cmnd *scp)
  * host
  **/
 static int
-megaraid_reset_handler(struct scsi_cmnd *scp)
+__megaraid_reset_handler(struct scsi_cmnd *scp)
 {
         adapter_t       *adapter;
         scb_t           *scb;
@@ -2847,6 +2847,18 @@ megaraid_reset_handler(struct scsi_cmnd *scp)
         return rval;
 }
 
+static int
+megaraid_reset_handler(struct scsi_cmnd *cmd)
+{
+        int rc;
+
+        spin_lock_irq(cmd->device->host->host_lock);
+        rc = __megaraid_reset_handler(cmd);
+        spin_unlock_irq(cmd->device->host->host_lock);
+
+        return rc;
+}
+
 
 /*
  * START: internal commands library
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 638be81c4509..907a1e8cc880 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -1114,7 +1114,13 @@ qla1280_eh_abort(struct scsi_cmnd * cmd)
 static int
 qla1280_eh_device_reset(struct scsi_cmnd *cmd)
 {
-        return qla1280_error_action(cmd, DEVICE_RESET);
+        int rc;
+
+        spin_lock_irq(cmd->device->host->host_lock);
+        rc = qla1280_error_action(cmd, DEVICE_RESET);
+        spin_unlock_irq(cmd->device->host->host_lock);
+
+        return rc;
 }
 
 /**************************************************************************
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 1693998aa727..360974eb2b26 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -613,12 +613,8 @@ qla2xxx_eh_device_reset(struct scsi_cmnd *cmd)
         qla_printk(KERN_INFO, ha,
             "scsi(%ld:%d:%d): DEVICE RESET ISSUED.\n", ha->host_no, id, lun);
 
-        spin_unlock_irq(ha->host->host_lock);
-
-        if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS) {
-                spin_lock_irq(ha->host->host_lock);
+        if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
                 goto eh_dev_reset_done;
-        }
 
         if (qla2x00_wait_for_loop_ready(ha) == QLA_SUCCESS) {
                 if (qla2x00_device_reset(ha, fcport) == 0)
@@ -669,8 +665,6 @@ qla2xxx_eh_device_reset(struct scsi_cmnd *cmd)
             "scsi(%ld:%d:%d): DEVICE RESET SUCCEEDED.\n", ha->host_no, id, lun);
 
 eh_dev_reset_done:
-        spin_lock_irq(ha->host->host_lock);
-
         return ret;
 }
 
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 3877a78f5e50..87d925055b47 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -857,17 +857,14 @@ static int scsi_eh_abort_cmds(struct list_head *work_q,
  **/
 static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
 {
-        unsigned long flags;
-        int rtn = FAILED;
+        int rtn;
 
         if (!scmd->device->host->hostt->eh_device_reset_handler)
-                return rtn;
+                return FAILED;
 
         scmd->owner = SCSI_OWNER_LOWLEVEL;
 
-        spin_lock_irqsave(scmd->device->host->host_lock, flags);
         rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
-        spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
 
         if (rtn == SUCCESS) {
                 scmd->device->was_reset = 1;
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index e2d055ed5b6f..5ea62552d47d 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -867,7 +867,13 @@ static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
 
 static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
 {
-        return sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
+        int rc;
+
+        spin_lock_irq(cmd->device->host->host_lock);
+        rc = sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
+        spin_unlock_irq(cmd->device->host->host_lock);
+
+        return rc;
 }
 
 static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 7dce9c01c357..739a9143477d 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -253,8 +253,6 @@ static int device_reset(struct scsi_cmnd *srb)
 
         US_DEBUGP("%s called\n", __FUNCTION__);
 
-        scsi_unlock(us_to_host(us));
-
         /* lock the device pointers and do the reset */
         down(&(us->dev_semaphore));
         if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
@@ -264,8 +262,6 @@ static int device_reset(struct scsi_cmnd *srb)
                 result = us->transport_reset(us);
         up(&(us->dev_semaphore));
 
-        /* lock the host for the return */
-        scsi_lock(us_to_host(us));
         return result;
 }