diff options
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 98 |
1 files changed, 59 insertions, 39 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 610ee41fa54c..47835c4b4ee0 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -562,7 +562,6 @@ static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd) { scsi_mq_free_sgtables(cmd); scsi_uninit_cmd(cmd); - scsi_del_cmd_from_list(cmd); } /* Returns false when no more bytes to process, true if there are more */ @@ -1098,36 +1097,7 @@ static void scsi_cleanup_rq(struct request *rq) } } -/* Add a command to the list used by the aacraid and dpt_i2o drivers */ -void scsi_add_cmd_to_list(struct scsi_cmnd *cmd) -{ - struct scsi_device *sdev = cmd->device; - struct Scsi_Host *shost = sdev->host; - unsigned long flags; - - if (shost->use_cmd_list) { - spin_lock_irqsave(&sdev->list_lock, flags); - list_add_tail(&cmd->list, &sdev->cmd_list); - spin_unlock_irqrestore(&sdev->list_lock, flags); - } -} - -/* Remove a command from the list used by the aacraid and dpt_i2o drivers */ -void scsi_del_cmd_from_list(struct scsi_cmnd *cmd) -{ - struct scsi_device *sdev = cmd->device; - struct Scsi_Host *shost = sdev->host; - unsigned long flags; - - if (shost->use_cmd_list) { - spin_lock_irqsave(&sdev->list_lock, flags); - BUG_ON(list_empty(&cmd->list)); - list_del_init(&cmd->list); - spin_unlock_irqrestore(&sdev->list_lock, flags); - } -} - -/* Called after a request has been started. */ +/* Called before a request is prepared. See also scsi_mq_prep_fn(). */ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) { void *buf = cmd->sense_buffer; @@ -1135,7 +1105,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) struct request *rq = blk_mq_rq_from_pdu(cmd); unsigned int flags = cmd->flags & SCMD_PRESERVED_FLAGS; unsigned long jiffies_at_alloc; - int retries; + int retries, to_clear; bool in_flight; if (!blk_rq_is_scsi(rq) && !(flags & SCMD_INITIALIZED)) { @@ -1146,9 +1116,15 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) jiffies_at_alloc = cmd->jiffies_at_alloc; retries = cmd->retries; in_flight = test_bit(SCMD_STATE_INFLIGHT, &cmd->state); - /* zero out the cmd, except for the embedded scsi_request */ - memset((char *)cmd + sizeof(cmd->req), 0, - sizeof(*cmd) - sizeof(cmd->req) + dev->host->hostt->cmd_size); + /* + * Zero out the cmd, except for the embedded scsi_request. Only clear + * the driver-private command data if the LLD does not supply a + * function to initialize that data. + */ + to_clear = sizeof(*cmd) - sizeof(cmd->req); + if (!dev->host->hostt->init_cmd_priv) + to_clear += dev->host->hostt->cmd_size; + memset((char *)cmd + sizeof(cmd->req), 0, to_clear); cmd->device = dev; cmd->sense_buffer = buf; @@ -1160,7 +1136,6 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) if (in_flight) __set_bit(SCMD_STATE_INFLIGHT, &cmd->state); - scsi_add_cmd_to_list(cmd); } static blk_status_t scsi_setup_scsi_cmnd(struct scsi_device *sdev, @@ -1240,8 +1215,11 @@ scsi_prep_state_check(struct scsi_device *sdev, struct request *req) * commands. The device must be brought online * before trying any recovery commands. */ - sdev_printk(KERN_ERR, sdev, - "rejecting I/O to offline device\n"); + if (!sdev->offline_already) { + sdev->offline_already = true; + sdev_printk(KERN_ERR, sdev, + "rejecting I/O to offline device\n"); + } return BLK_STS_IOERR; case SDEV_DEL: /* @@ -1742,6 +1720,7 @@ static int scsi_mq_init_request(struct blk_mq_tag_set *set, struct request *rq, const bool unchecked_isa_dma = shost->unchecked_isa_dma; struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq); struct scatterlist *sg; + int ret = 0; if (unchecked_isa_dma) cmd->flags |= SCMD_UNCHECKED_ISA_DMA; @@ -1757,14 +1736,24 @@ static int scsi_mq_init_request(struct blk_mq_tag_set *set, struct request *rq, cmd->prot_sdb = (void *)sg + scsi_mq_inline_sgl_size(shost); } - return 0; + if (shost->hostt->init_cmd_priv) { + ret = shost->hostt->init_cmd_priv(shost, cmd); + if (ret < 0) + scsi_free_sense_buffer(unchecked_isa_dma, + cmd->sense_buffer); + } + + return ret; } static void scsi_mq_exit_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx) { + struct Scsi_Host *shost = set->driver_data; struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq); + if (shost->hostt->exit_cmd_priv) + shost->hostt->exit_cmd_priv(shost, cmd); scsi_free_sense_buffer(cmd->flags & SCMD_UNCHECKED_ISA_DMA, cmd->sense_buffer); } @@ -2340,6 +2329,7 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state) break; } + sdev->offline_already = false; sdev->sdev_state = state; return 0; @@ -2845,6 +2835,36 @@ scsi_target_unblock(struct device *dev, enum scsi_device_state new_state) } EXPORT_SYMBOL_GPL(scsi_target_unblock); +int +scsi_host_block(struct Scsi_Host *shost) +{ + struct scsi_device *sdev; + int ret = 0; + + shost_for_each_device(sdev, shost) { + ret = scsi_internal_device_block(sdev); + if (ret) + break; + } + return ret; +} +EXPORT_SYMBOL_GPL(scsi_host_block); + +int +scsi_host_unblock(struct Scsi_Host *shost, int new_state) +{ + struct scsi_device *sdev; + int ret = 0; + + shost_for_each_device(sdev, shost) { + ret = scsi_internal_device_unblock(sdev, new_state); + if (ret) + break; + } + return ret; +} +EXPORT_SYMBOL_GPL(scsi_host_unblock); + /** * scsi_kmap_atomic_sg - find and atomically map an sg-elemnt * @sgl: scatter-gather list |