libata: fix ata_scmd_need_defer()
Fix ata_scmd_need_defer() such that... * whether NCQ is used or not is exactly determined using the same criteria as the issue path. * defer-check is performed in all cases. This fixes race condition where turning off NCQ on the fly causes non-NCQ commands sneak into NCQ phase. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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1 changed files with 2 additions and 4 deletions
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@ -1496,11 +1496,9 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
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static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
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{
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struct ata_port *ap = dev->ap;
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int is_ncq = is_io && ata_ncq_enabled(dev);
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if (!(dev->flags & ATA_DFLAG_NCQ))
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return 0;
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if (is_io) {
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if (is_ncq) {
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if (!ata_tag_valid(ap->active_tag))
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return 0;
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} else {
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