Niklas Cassel ce4548807d
ata: libata-scsi: do not use the deferred QC feature for ATA_DEFER_PORT ...
The deferred QC feature was meant to handle mixed NCQ and non-NCQ commands,
i.e. for return value ATA_DEFER_LINK.
ATA_DEFER_PORT is returned by PATA drivers, but also certain SATA drivers
like sata_mv and sata_sil24 that uses ap->excl_link to workaround hardware
bugs in these HBAs. Regardless of the reason, using the deferred QC feature
for ATA_DEFER_PORT is always wrong, and will break the ap->excl_link usage
of the SATA drivers that rely on that feature.
Modify ata_scsi_qc_issue() to only use the deferred QC feature when mixing
NCQ and non-NCQ commands, i.e. ATA_DEFER_LINK.
Fixes: 0ea84089dblinux@tkel.ly >
Reviewed-by: Damien Le Moal <dlemoal@kernel.org >
Signed-off-by: Niklas Cassel <cassel@kernel.org >
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ce4548807d