From: Tejun Heo <[email protected]> ------------------- This is a commit scheduled for the next v2.6.34 longterm release. If you see a problem with using this for longterm, please comment. -------------------
commit f08dc1ac6b15c681f4643d8da1700e06c3855608 upstream. ata_qc_complete() contains special handling for certain commands. For example, it schedules EH for device revalidation after certain configurations are changed. These shouldn't be applied to EH commands but they were. In most cases, it doesn't cause an actual problem because EH doesn't issue any command which would trigger special handling; however, ACPI can issue such commands via _GTF which can cause weird interactions. Restructure ata_qc_complete() such that EH commands are always passed on to __ata_qc_complete(). stable: Please apply to -stable only after 2.6.38 is released. Signed-off-by: Tejun Heo <[email protected]> Reported-by: Kyle McMartin <[email protected]> Signed-off-by: Jeff Garzik <[email protected]> Signed-off-by: Paul Gortmaker <[email protected]> --- drivers/ata/libata-core.c | 24 +++++++++++++++--------- 1 files changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 5405b36..6e4b795 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5038,9 +5038,6 @@ static void ata_verify_xfer(struct ata_queued_cmd *qc) { struct ata_device *dev = qc->dev; - if (ata_tag_internal(qc->tag)) - return; - if (ata_is_nodata(qc->tf.protocol)) return; @@ -5084,14 +5081,23 @@ void ata_qc_complete(struct ata_queued_cmd *qc) if (unlikely(qc->err_mask)) qc->flags |= ATA_QCFLAG_FAILED; - if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) { - /* always fill result TF for failed qc */ + /* + * Finish internal commands without any further processing + * and always with the result TF filled. + */ + if (unlikely(ata_tag_internal(qc->tag))) { fill_result_tf(qc); + __ata_qc_complete(qc); + return; + } - if (!ata_tag_internal(qc->tag)) - ata_qc_schedule_eh(qc); - else - __ata_qc_complete(qc); + /* + * Non-internal qc has failed. Fill the result TF and + * summon EH. + */ + if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) { + fill_result_tf(qc); + ata_qc_schedule_eh(qc); return; } -- 1.7.4.4 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
