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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-10-27 19:20:59 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-10-27 19:25:30 +0100 |
| commit | 3070f69b66b7ab2f02d8a2500edae07039c38508 (patch) | |
| tree | 508c5f64ac507d8248f591d9e1a6da93379004e5 | |
| parent | 1d63e726408dfdb3e10ed8f00c383b30ebb333d3 (diff) | |
| download | linux-3070f69b66b7ab2f02d8a2500edae07039c38508.tar.bz2 | |
scsi: make sure that scsi_init_shared_tag_map() doesn't overwrite existing map
Right now callers have to check whether scsi_host->bqt is already
set up, it's much cleaner to just have scsi_init_shared_tag_map()
does this check on its own.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | include/scsi/scsi_tcq.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h index cf4c219c0b5c..17231385cb37 100644 --- a/include/scsi/scsi_tcq.h +++ b/include/scsi/scsi_tcq.h @@ -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; } /** |