diff options
Diffstat (limited to 'drivers/ata/libata-scsi.c')
| -rw-r--r-- | drivers/ata/libata-scsi.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 94339c2aed1b..59c9d721b347 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -3666,7 +3666,8 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) */ shost->max_host_blocked = 1; - scsi_init_shared_tag_map(shost, host->n_tags); + if (scsi_init_shared_tag_map(shost, host->n_tags)) + goto err_add; rc = scsi_add_host_with_dma(ap->scsi_host, &ap->tdev, ap->host->dev); @@ -4230,3 +4231,28 @@ int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) return rc; } EXPORT_SYMBOL_GPL(ata_sas_queuecmd); + +int ata_sas_allocate_tag(struct ata_port *ap) +{ + unsigned int max_queue = ap->host->n_tags; + unsigned int i, tag; + + for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) { + tag = tag < max_queue ? tag : 0; + + /* the last tag is reserved for internal command. */ + if (tag == ATA_TAG_INTERNAL) + continue; + + if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) { + ap->sas_last_tag = tag; + return tag; + } + } + return -1; +} + +void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) +{ + clear_bit(tag, &ap->sas_tag_allocated); +} |