linux-kernel - Re: [PATCH 1/3] scsi: set to WCE if usb cache quirk is present.

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Date:	Thu, 7 Jun 2012 09:40:19 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	James.Bottomley@...senpartnership.com, gregkh@...uxfoundation.org,
	mdharm-usb@...-eyed-alien.net, linux-usb@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Pankaj Kumar <pankaj.km@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH 1/3] scsi: set to WCE if usb cache quirk is present.

Hi Alan.

I will send patch v2 after chaing code.
Thanks for your review.

2012/6/7, Alan Stern <stern@...land.harvard.edu>:
> On Wed, 6 Jun 2012, Namjae Jeon wrote:
>
>> Make use of USB quirk method to identify such HDD while reading the cache
>> status in sd_probe(). If cache quirk is present for the HDD, lets assume
>> that cache is enabled and make WCE bit equal to 1.
>
> Your lines should be wrapped after 72 columns or so.
>
> Calling this a "quirk" sounds strange.  Really, your new flag indicates
> that WCE should default to "on" instead of "off".  How about calling it
> "wce_default_on" instead of "wce_quirk"?
>
>> --- a/include/scsi/scsi_device.h
>> +++ b/include/scsi/scsi_device.h
>> @@ -152,6 +152,7 @@ struct scsi_device {
>>  	unsigned no_read_disc_info:1;	/* Avoid READ_DISC_INFO cmds */
>>  	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
>>  	unsigned is_visible:1;	/* is the device visible in sysfs */
>> +	unsigned wce_quirk:1; /* cache read page is not available */
>
> The comment is wrong.  There's no need for a quirk to indicate the
> cache page is unavailable; the driver already knows when the page is
> unavailable.  Rather, the quirk indicates that WCE should default to
> "on".
>
> Alan Stern
>
>
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