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| author | Tejun Heo <htejun@gmail.com> | 2006-05-15 20:57:32 +0900 |
|---|---|---|
| committer | Tejun Heo <htejun@gmail.com> | 2006-05-15 20:57:32 +0900 |
| commit | 7401abf2f44695ef44eef47d5deba1c20214a063 (patch) | |
| tree | 582a02c76d1d975846bd779923d715cb617efef9 /drivers/scsi/libata-core.c | |
| parent | f8c2c4202d86e14ca03b7adc7ebcb30fc74b24e1 (diff) | |
| download | lwn-7401abf2f44695ef44eef47d5deba1c20214a063.tar.gz lwn-7401abf2f44695ef44eef47d5deba1c20214a063.zip | |
[PATCH] libata: clear ap->active_tag atomically w.r.t. command completion
ap->active_tag was cleared in ata_qc_free(). This left ap->active_tag
dangling after ata_qc_complete(). Spurious interrupts inbetween could
incorrectly access the qc. Clear active_tag in ata_qc_complete().
This change is necessary for later EH changes.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/scsi/libata-core.c')
| -rw-r--r-- | drivers/scsi/libata-core.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index 1669dae53ce3..86cd0e0895d0 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -4083,8 +4083,6 @@ void ata_qc_free(struct ata_queued_cmd *qc) qc->flags = 0; tag = qc->tag; if (likely(ata_tag_valid(tag))) { - if (tag == ap->active_tag) - ap->active_tag = ATA_TAG_POISON; qc->tag = ATA_TAG_POISON; clear_bit(tag, &ap->qactive); } @@ -4098,6 +4096,9 @@ void __ata_qc_complete(struct ata_queued_cmd *qc) if (likely(qc->flags & ATA_QCFLAG_DMAMAP)) ata_sg_clean(qc); + /* command should be marked inactive atomically with qc completion */ + qc->ap->active_tag = ATA_TAG_POISON; + /* atapi: mark qc as inactive to prevent the interrupt handler * from completing the command twice later, before the error handler * is called. (when rc != 0 and atapi request sense is needed) |