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[SCSI] sd: fix cache flushing on module removal (and individual device removal) 

The fix isn't actually in sd: it's in scsi_device_get().  I modified it
to allow devices to be returned in SDEV_CANCEL, but not SDEV_DEL.  This
means that the device_remove_driver, which occurs in device_del() in
scsi_remove_device() after the device has gone into SDEV_CANCEL is now
effective at flushing the cache.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2006-08-31 18:15:22 -04:00 committed by James Bottomley
parent 86e33a296c
commit 85b6c720b0
1 changed files with 9 additions and 6 deletions
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15
drivers/scsi/scsi.c
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@ -851,14 +851,14 @@ EXPORT_SYMBOL(scsi_track_queue_full);
*/
int scsi_device_get(struct scsi_device *sdev)
{
if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)
if (sdev->sdev_state == SDEV_DEL)
return -ENXIO;
if (!get_device(&sdev->sdev_gendev))
return -ENXIO;
if (!try_module_get(sdev->host->hostt->module)) {
put_device(&sdev->sdev_gendev);
return -ENXIO;
}
/* We can fail this if we're doing SCSI operations
* from module exit (like cache flush) */
try_module_get(sdev->host->hostt->module);
return 0;
}
EXPORT_SYMBOL(scsi_device_get);
@ -873,7 +873,10 @@ EXPORT_SYMBOL(scsi_device_get);
*/
void scsi_device_put(struct scsi_device *sdev)
{
module_put(sdev->host->hostt->module);
/* The module refcount will be zero if scsi_device_get()
* was called from a module removal routine */
if (likely(module_refcount(sdev->host->hostt->module) != 0))
module_put(sdev->host->hostt->module);
put_device(&sdev->sdev_gendev);
}
EXPORT_SYMBOL(scsi_device_put);