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OpenCloudOS-Kernel
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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  libata: fix NCQ devices behind port multipliers
  scsi: make sure that scsi_init_shared_tag_map() doesn't overwrite existing map
This commit is contained in:
Linus Torvalds 2008-10-27 11:41:51 -07:00
parent b70a6b27ed 43a49cbdf3
commit 49fdf6785f
2 changed files with 21 additions and 2 deletions
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9
drivers/ata/libata-scsi.c
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@ -1107,6 +1107,15 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
depth = min(ATA_MAX_QUEUE - 1, depth);
/*
* If this device is behind a port multiplier, we have
* to share the tag map between all devices on that PMP.
* Set up the shared tag map here and we get automatic.
*/
if (dev->link->ap->pmp_link)
scsi_init_shared_tag_map(sdev->host, ATA_MAX_QUEUE - 1);
scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
scsi_activate_tcq(sdev, depth);
}

14
include/scsi/scsi_tcq.h
View File

@ -140,8 +140,18 @@ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag)
*/
static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
{
shost->bqt = blk_init_tags(depth);
return shost->bqt ? 0 : -ENOMEM;
/*
* If the shared tag map isn't already initialized, do it now.
* This saves callers from having to check ->bqt when setting up
* devices on the shared host (for libata)
*/
if (!shost->bqt) {
shost->bqt = blk_init_tags(depth);
if (!shost->bqt)
return -ENOMEM;
}
return 0;
}
/**