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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-10-24 09:22:42 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-24 08:22:38 -0700 |
| commit | e013e13bf605b9e6b702adffbe2853cfc60e7806 (patch) | |
| tree | f69ce0b35fa8df2447d06eee64f4f579b883e701 /drivers/ata | |
| parent | 57f8f7b60db6f1ed2c6918ab9230c4623a9dbe37 (diff) | |
| download | linux-e013e13bf605b9e6b702adffbe2853cfc60e7806.tar.bz2 | |
libata: fix bug with non-ncq devices
The recent commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e ("libata:
switch to using block layer tagging support") to enable support for
block layer tagging in libata was broken for non-NCQ devices
The block layer initializes the tag field to -1 to detect invalid uses
of a tag, and if the libata devices does NOT support NCQ, we just used
that field to index the internal command list. So we need to check for
-1 first and only use the tag field if it's valid.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Tested-by: Paul Mundt <lethal@linux-sh.org>
Tested-by: Dave Young <hidave.darkstar@gmail.com>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-scsi.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index d5b9b7266c8b..4b95c4387e9e 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -708,7 +708,11 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, { struct ata_queued_cmd *qc; - qc = ata_qc_new_init(dev, cmd->request->tag); + if (cmd->request->tag != -1) + qc = ata_qc_new_init(dev, cmd->request->tag); + else + qc = ata_qc_new_init(dev, 0); + if (qc) { qc->scsicmd = cmd; qc->scsidone = done; |