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path: root/drivers/scsi/scsi_lib.c
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Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c98
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