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[SCSI] add missing scan mutex to scsi_scan_target() 

This patch (as543) adds a private entry point to scsi_scan_target, for use
when the caller already owns the scan_mutex, and updates the kerneldoc for
that routine (which was badly out-of-date).  It converts scsi_scan_channel
to use the new entry point.  Lastly, it modifies scsi_get_host_dev to make
it acquire the scan_mutex, necessary since the routine adds a new
scsi_device even if it doesn't do any actual scanning.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Alan Stern 2005-07-26 10:18:45 -04:00 committed by James Bottomley
parent caf39e87cc
commit e517d3133f
1 changed files with 40 additions and 27 deletions
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67
drivers/scsi/scsi_scan.c
View File

@ -1276,27 +1276,8 @@ void scsi_rescan_device(struct device *dev)
}
EXPORT_SYMBOL(scsi_rescan_device);
/**
* scsi_scan_target - scan a target id, possibly including all LUNs on the
* target.
* @sdevsca: Scsi_Device handle for scanning
* @shost: host to scan
* @channel: channel to scan
* @id: target id to scan
*
* Description:
* Scan the target id on @shost, @channel, and @id. Scan at least LUN
* 0, and possibly all LUNs on the target id.
*
* Use the pre-allocated @sdevscan as a handle for the scanning. This
* function sets sdevscan->host, sdevscan->id and sdevscan->lun; the
* scanning functions modify sdevscan->lun.
*
* First try a REPORT LUN scan, if that does not scan the target, do a
* sequential scan of LUNs on the target id.
**/
void scsi_scan_target(struct device *parent, unsigned int channel,
unsigned int id, unsigned int lun, int rescan)
static void __scsi_scan_target(struct device *parent, unsigned int channel,
unsigned int id, unsigned int lun, int rescan)
{
struct Scsi_Host *shost = dev_to_shost(parent);
int bflags = 0;
@ -1310,9 +1291,7 @@ void scsi_scan_target(struct device *parent, unsigned int channel,
*/
return;
starget = scsi_alloc_target(parent, channel, id);
if (!starget)
return;
@ -1358,6 +1337,33 @@ void scsi_scan_target(struct device *parent, unsigned int channel,
put_device(&starget->dev);
}
/**
* scsi_scan_target - scan a target id, possibly including all LUNs on the
* target.
* @parent: host to scan
* @channel: channel to scan
* @id: target id to scan
* @lun: Specific LUN to scan or SCAN_WILD_CARD
* @rescan: passed to LUN scanning routines
*
* Description:
* Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
* and possibly all LUNs on the target id.
*
* First try a REPORT LUN scan, if that does not scan the target, do a
* sequential scan of LUNs on the target id.
**/
void scsi_scan_target(struct device *parent, unsigned int channel,
unsigned int id, unsigned int lun, int rescan)
{
struct Scsi_Host *shost = dev_to_shost(parent);
down(&shost->scan_mutex);
if (scsi_host_scan_allowed(shost))
__scsi_scan_target(parent, channel, id, lun, rescan);
up(&shost->scan_mutex);
}
EXPORT_SYMBOL(scsi_scan_target);
static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
@ -1383,10 +1389,12 @@ static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
order_id = shost->max_id - id - 1;
else
order_id = id;
scsi_scan_target(&shost->shost_gendev, channel, order_id, lun, rescan);
__scsi_scan_target(&shost->shost_gendev, channel,
order_id, lun, rescan);
}
else
scsi_scan_target(&shost->shost_gendev, channel, id, lun, rescan);
__scsi_scan_target(&shost->shost_gendev, channel,
id, lun, rescan);
}
int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
@ -1484,12 +1492,15 @@ void scsi_forget_host(struct Scsi_Host *shost)
*/
struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
{
struct scsi_device *sdev;
struct scsi_device *sdev = NULL;
struct scsi_target *starget;
down(&shost->scan_mutex);
if (!scsi_host_scan_allowed(shost))
goto out;
starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
if (!starget)
return NULL;
goto out;
sdev = scsi_alloc_sdev(starget, 0, NULL);
if (sdev) {
@ -1497,6 +1508,8 @@ struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
sdev->borken = 0;
}
put_device(&starget->dev);
out:
up(&shost->scan_mutex);
return sdev;
}
EXPORT_SYMBOL(scsi_get_host_dev);