linux-kernel - Re: [PATCH v3 2/4] usb: storage: add support for write cache quirk on usb hdd

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Date:	Mon, 11 Jun 2012 08:30:01 +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, sshtylyov@...sta.com,
	bvanassche@....org, 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 v3 2/4] usb: storage: add support for write cache quirk on
 usb hdd

2012/6/11, Alan Stern <stern@...land.harvard.edu>:
> On Sat, 9 Jun 2012, Namjae Jeon wrote:
>
>> Add support for write cache quirk on usb hdd. scsi driver will be set to
>> wce
>> by detecting write cache quirk in quirk list when plugging usb hdd.
>
>> --- a/include/linux/usb_usual.h
>> +++ b/include/linux/usb_usual.h
>> @@ -64,7 +64,9 @@
>>  	US_FLAG(NO_READ_CAPACITY_16,	0x00080000)		\
>>  		/* cannot handle READ_CAPACITY_16 */		\
>>  	US_FLAG(INITIAL_READ10,	0x00100000)			\
>> -		/* Initial READ(10) (and others) must be retried */
>> +		/* Initial READ(10) (and others) must be retried */	\
>> +	US_FLAG(WRITE_CACHE,	0x00200000)			\
>> +		/* Write Cache status is not available */
>
> The documentation for the new flag should be added in the same patch
> along with the flag itself.  There's no reason to have separate
> patches.
Hi. Alan.
Okay, I see. I will merge documentation patch with this patch.
Thank you.

>
> Alan Stern
>
>
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