Re: [PATCH v2] libata: add support for NCQ commands for SG interface

[Mark Lord]

On 15-10-27 01:49 AM, vinayak.kale@xxxxxxxxx wrote:
> From: Vinayak Kale <vinayak.kale@xxxxxxxxxxx>
>
> This patch is needed to make NCQ commands with FPDMA protocol value
> (eg READ/WRITE FPDMA) work over SCSI Generic (SG) interface.
..
> +	/* For NCQ commands with FPDMA protocol, copy the tag value */
> +	if (tf->protocol == ATA_PROT_NCQ)
> +		tf->nsect = qc->tag << 3;
> +


What prevents the qc-tag value here from conflicting with in-flight I/O
using the exact same qc-tag ??
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