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scsi: Create two versions of scsi_internal_device_unblock() 

This will make it easier to serialize SCSI device state changes through
a mutex.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2017-06-02 14:21:54 -07:00 committed by Martin K. Petersen
parent 551eb598e5
commit 43f7571be0
3 changed files with 36 additions and 18 deletions
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4
drivers/scsi/mpt3sas/mpt3sas_scsih.c
View File

@ -2883,7 +2883,7 @@ _scsih_internal_device_unblock(struct scsi_device *sdev,
sdev_printk(KERN_WARNING, sdev, "device_unblock and setting to running, "
"handle(0x%04x)\n", sas_device_priv_data->sas_target->handle);
sas_device_priv_data->block = 0;
r = scsi_internal_device_unblock(sdev, SDEV_RUNNING);
r = scsi_internal_device_unblock_nowait(sdev, SDEV_RUNNING);
if (r == -EINVAL) {
/* The device has been set to SDEV_RUNNING by SD layer during
* device addition but the request queue is still stopped by
@ -2902,7 +2902,7 @@ _scsih_internal_device_unblock(struct scsi_device *sdev,
r, sas_device_priv_data->sas_target->handle);
sas_device_priv_data->block = 0;
r = scsi_internal_device_unblock(sdev, SDEV_RUNNING);
r = scsi_internal_device_unblock_nowait(sdev, SDEV_RUNNING);
if (r)
sdev_printk(KERN_WARNING, sdev, "retried device_unblock"
" failed with return(%d) for handle(0x%04x)\n",

46
drivers/scsi/scsi_lib.c
View File

@ -3023,24 +3023,22 @@ static int scsi_internal_device_block(struct scsi_device *sdev)
}
/**
* scsi_internal_device_unblock - resume a device after a block request
* scsi_internal_device_unblock_nowait - resume a device after a block request
* @sdev: device to resume
* @new_state: state to set devices to after unblocking
* @new_state: state to set the device to after unblocking
*
* Called by scsi lld's or the midlayer to restart the device queue
* for the previously suspended scsi device. Called from interrupt or
* normal process context.
* Restart the device queue for a previously suspended SCSI device. Does not
* sleep.
*
* Returns zero if successful or error if not.
* Returns zero if successful or a negative error code upon failure.
*
* Notes:
* This routine transitions the device to the SDEV_RUNNING state
* or to one of the offline states (which must be a legal transition)
* allowing the midlayer to goose the queue for this device.
* Notes:
* This routine transitions the device to the SDEV_RUNNING state or to one of
* the offline states (which must be a legal transition) allowing the midlayer
* to goose the queue for this device.
*/
int
scsi_internal_device_unblock(struct scsi_device *sdev,
enum scsi_device_state new_state)
int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
enum scsi_device_state new_state)
{
struct request_queue *q = sdev->request_queue;
unsigned long flags;
@ -3072,7 +3070,27 @@ scsi_internal_device_unblock(struct scsi_device *sdev,
return 0;
}
EXPORT_SYMBOL_GPL(scsi_internal_device_unblock);
EXPORT_SYMBOL_GPL(scsi_internal_device_unblock_nowait);
/**
* scsi_internal_device_unblock - resume a device after a block request
* @sdev: device to resume
* @new_state: state to set the device to after unblocking
*
* Restart the device queue for a previously suspended SCSI device. May sleep.
*
* Returns zero if successful or a negative error code upon failure.
*
* Notes:
* This routine transitions the device to the SDEV_RUNNING state or to one of
* the offline states (which must be a legal transition) allowing the midlayer
* to goose the queue for this device.
*/
static int scsi_internal_device_unblock(struct scsi_device *sdev,
enum scsi_device_state new_state)
{
return scsi_internal_device_unblock_nowait(sdev, new_state);
}
static void
device_block(struct scsi_device *sdev, void *data)

4
include/scsi/scsi_device.h
View File

@ -473,8 +473,8 @@ static inline int scsi_device_created(struct scsi_device *sdev)
}
int scsi_internal_device_block_nowait(struct scsi_device *sdev);
int scsi_internal_device_unblock(struct scsi_device *sdev,
enum scsi_device_state new_state);
int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
enum scsi_device_state new_state);
/* accessor functions for the SCSI parameters */
static inline int scsi_device_sync(struct scsi_device *sdev)