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

From	Mark Lord <kernel@start.ca>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] libata: add support for NCQ commands for SG interface
Date	2015-11-16 15:10 +0100
Message-ID	<qvsDM-8kq-35@gated-at.bofh.it> (permalink)
References	<qo5sB-1nr-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On 15-10-27 01:49 AM, vinayak.kale@gmail.com wrote:
> From: Vinayak Kale <vinayak.kale@seagate.com>
>
> 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 ??
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH v2] libata: add support for NCQ commands for SG interface Mark Lord <kernel@start.ca> - 2015-11-16 15:10 +0100
  Re: [PATCH v2] libata: add support for NCQ commands for SG interface Tejun Heo <tj@kernel.org> - 2015-11-16 16:40 +0100

csiph-web