linux-kernel - Re: [usb-storage] BUG: SCSI: usb storage SDHC card doesn't work in 2.6.27-rc1

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Message-Id: <20080730150953.771b1345.zaitcev@redhat.com>
Date:	Wed, 30 Jul 2008 15:09:53 -0600
From:	Pete Zaitcev <zaitcev@...hat.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Douglas Gilbert <dougg@...que.net>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Matt Frost <artusemrys@...global.net>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	USB Storage list <usb-storage@...ts.one-eyed-alien.net>,
	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Matthew Frost <artusemrys@...oo.com>, zaitcev@...hat.com
Subject: Re: [usb-storage] BUG: SCSI: usb storage SDHC card doesn't work in
 2.6.27-rc1

On Wed, 30 Jul 2008 17:00:10 -0400 (EDT), Alan Stern <stern@...land.harvard.edu> wrote:

> +++ 2.6.26/drivers/usb/storage/transport.c
> @@ -1034,8 +1034,21 @@ int usb_stor_Bulk_transport(struct scsi_
> +		/* Heuristically detect devices that generate bogus residues
> +		 * by seeing what happens with INQUIRY and READ CAPACITY
> +		 * commands.
> +		 */
> +		if (bcs->Status == US_BULK_STAT_OK &&
> +				scsi_get_resid(srb) == 0 &&
> +					((srb->cmnd[0] == INQUIRY &&
> +						transfer_length == 36) ||
> +					(srb->cmnd[0] == READ_CAPACITY &&
> +						transfer_length == 8))) {
> +			us->flags |= US_FL_IGNORE_RESIDUE;

Why do you do this for INQUIRY and READ_CAPACITY only?
Why not do it for any command?

-- Pete
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