diff options
| -rw-r--r-- | drivers/scsi/device_handler/scsi_dh_hp_sw.c | 87 |
1 files changed, 54 insertions, 33 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c index 0aacafc96f2..857fdd6032b 100644 --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c @@ -39,8 +39,14 @@ struct hp_sw_dh_data { unsigned char sense[SCSI_SENSE_BUFFERSIZE]; int path_state; int retries; + int retry_cnt; + struct scsi_device *sdev; + activate_complete callback_fn; + void *callback_data; }; +static int hp_sw_start_stop(struct hp_sw_dh_data *); + static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev) { struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; @@ -191,19 +197,53 @@ static int start_done(struct scsi_device *sdev, unsigned char *sense) return rc; } +static void start_stop_endio(struct request *req, int error) +{ + struct hp_sw_dh_data *h = req->end_io_data; + unsigned err = SCSI_DH_OK; + + if (error || host_byte(req->errors) != DID_OK || + msg_byte(req->errors) != COMMAND_COMPLETE) { + sdev_printk(KERN_WARNING, h->sdev, + "%s: sending start_stop_unit failed with %x\n", + HP_SW_NAME, req->errors); + err = SCSI_DH_IO; + goto done; + } + + if (req->sense_len > 0) { + err = start_done(h->sdev, h->sense); + if (err == SCSI_DH_RETRY) { + err = SCSI_DH_IO; + if (--h->retry_cnt) { + blk_put_request(req); + err = hp_sw_start_stop(h); + if (err == SCSI_DH_OK) + return; + } + } + } +done: + blk_put_request(req); + if (h->callback_fn) { + h->callback_fn(h->callback_data, err); + h->callback_fn = h->callback_data = NULL; + } + return; + +} + /* * hp_sw_start_stop - Send START STOP UNIT command * @sdev: sdev command should be sent to * * Sending START STOP UNIT activates the SP. */ -static int hp_sw_start_stop(struct scsi_device *sdev, struct hp_sw_dh_data *h) +static int hp_sw_start_stop(struct hp_sw_dh_data *h) { struct request *req; - int ret, retry; -retry: - req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); + req = blk_get_request(h->sdev->request_queue, WRITE, GFP_ATOMIC); if (!req) return SCSI_DH_RES_TEMP_UNAVAIL; @@ -217,32 +257,10 @@ retry: req->sense = h->sense; memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); req->sense_len = 0; - retry = h->retries; - - ret = blk_execute_rq(req->q, NULL, req, 1); - if (ret == -EIO) { - if (req->sense_len > 0) { - ret = start_done(sdev, h->sense); - } else { - sdev_printk(KERN_WARNING, sdev, - "%s: sending start_stop_unit failed with %x\n", - HP_SW_NAME, req->errors); - ret = SCSI_DH_IO; - } - } else - ret = SCSI_DH_OK; - - if (ret == SCSI_DH_RETRY) { - if (--retry) { - blk_put_request(req); - goto retry; - } - ret = SCSI_DH_IO; - } - - blk_put_request(req); + req->end_io_data = h; - return ret; + blk_execute_rq_nowait(req->q, NULL, req, 1, start_stop_endio); + return SCSI_DH_OK; } static int hp_sw_prep_fn(struct scsi_device *sdev, struct request *req) @@ -277,11 +295,13 @@ static int hp_sw_activate(struct scsi_device *sdev, ret = hp_sw_tur(sdev, h); if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE) { - ret = hp_sw_start_stop(sdev, h); + h->retry_cnt = h->retries; + h->callback_fn = fn; + h->callback_data = data; + ret = hp_sw_start_stop(h); if (ret == SCSI_DH_OK) - sdev_printk(KERN_INFO, sdev, - "%s: activated path\n", - HP_SW_NAME); + return 0; + h->callback_fn = h->callback_data = NULL; } if (fn) @@ -329,6 +349,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev) h = (struct hp_sw_dh_data *) scsi_dh_data->buf; h->path_state = HP_SW_PATH_UNINITIALIZED; h->retries = HP_SW_RETRIES; + h->sdev = sdev; ret = hp_sw_tur(sdev, h); if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED) |