qla4xxx: Export sysfs DDBs from DPC handler

Issue:
modprobe qla4xxx is killed by systemd due to timeout.

Solution:
The exporting of sysfs DDBs from qla4xxx_probe_adapter added delay of
approximately 15s due to which system-udevd killed the modprobe of the
driver. Added fix to export the sysfs DDBs from the DPC handler.

Signed-off-by: Nilesh Javali <nilesh.javali@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Christoph Hellwig <hch@lst.de>

3 files changed, 11 insertions, 6 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h
index 73a502288bde..8f6d0fb2cd80 100644
--- a/drivers/scsi/qla4xxx/ql4_def.h
+++ b/drivers/scsi/qla4xxx/ql4_def.h
@@ -601,6 +601,7 @@ struct scsi_qla_host {
 #define DPC_HA_NEED_QUIESCENT           22 /* 0x00400000 ISP-82xx only*/
 #define DPC_POST_IDC_ACK                23 /* 0x00800000 */
 #define DPC_RESTORE_ACB                 24 /* 0x01000000 */
+#define DPC_SYSFS_DDB_EXPORT            25 /* 0x02000000 */
 
         struct Scsi_Host *host; /* pointer to host data */
         uint32_t tot_ddbs;
diff --git a/drivers/scsi/qla4xxx/ql4_glbl.h b/drivers/scsi/qla4xxx/ql4_glbl.h
index 20354754faa2..5f58b451327e 100644
--- a/drivers/scsi/qla4xxx/ql4_glbl.h
+++ b/drivers/scsi/qla4xxx/ql4_glbl.h
@@ -281,6 +281,7 @@ int qla4_83xx_get_port_config(struct scsi_qla_host *ha, uint32_t *config);
 int qla4_83xx_set_port_config(struct scsi_qla_host *ha, uint32_t *config);
 int qla4_8xxx_check_init_adapter_retry(struct scsi_qla_host *ha);
 int qla4_83xx_is_detached(struct scsi_qla_host *ha);
+int qla4xxx_sysfs_ddb_export(struct scsi_qla_host *ha);
 
 extern int ql4xextended_error_logging;
 extern int ql4xdontresethba;
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index bb160409b7cb..9be829bb90db 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -4565,6 +4565,7 @@ static void qla4xxx_timer(struct scsi_qla_host *ha)
              test_bit(DPC_LINK_CHANGED, &ha->dpc_flags) ||
              test_bit(DPC_HA_UNRECOVERABLE, &ha->dpc_flags) ||
              test_bit(DPC_HA_NEED_QUIESCENT, &ha->dpc_flags) ||
+             test_bit(DPC_SYSFS_DDB_EXPORT, &ha->dpc_flags) ||
              test_bit(DPC_AEN, &ha->dpc_flags)) {
                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
                               " - dpc flags = 0x%lx\n",
@@ -5429,6 +5430,11 @@ dpc_post_reset_ha:
                                 qla4xxx_relogin_all_devices(ha);
                 }
         }
+        if (test_and_clear_bit(DPC_SYSFS_DDB_EXPORT, &ha->dpc_flags)) {
+                if (qla4xxx_sysfs_ddb_export(ha))
+                        ql4_printk(KERN_ERR, ha, "%s: Error exporting ddb to sysfs\n",
+                                   __func__);
+        }
 }
 
 /**
@@ -8406,7 +8412,7 @@ exit_ddb_del:
  *
  * Export the firmware DDB for all send targets and normal targets to sysfs.
  **/
-static int qla4xxx_sysfs_ddb_export(struct scsi_qla_host *ha)
+int qla4xxx_sysfs_ddb_export(struct scsi_qla_host *ha)
 {
         struct dev_db_entry *fw_ddb_entry = NULL;
         dma_addr_t fw_ddb_entry_dma;
@@ -8844,11 +8850,8 @@ skip_retry_init:
                 ql4_printk(KERN_ERR, ha,
                            "%s: No iSCSI boot target configured\n", __func__);
 
-        if (qla4xxx_sysfs_ddb_export(ha))
-                ql4_printk(KERN_ERR, ha,
-                           "%s: Error exporting ddb to sysfs\n", __func__);
-
-                /* Perform the build ddb list and login to each */
+        set_bit(DPC_SYSFS_DDB_EXPORT, &ha->dpc_flags);
+        /* Perform the build ddb list and login to each */
         qla4xxx_build_ddb_list(ha, INIT_ADAPTER);
         iscsi_host_for_each_session(ha->host, qla4xxx_login_flash_ddb);
         qla4xxx_wait_login_resp_boot_tgt(ha);