linux-kernel - Re: [PATCH v4 3/3] usb: storage: update usb devices for write cache quirk in quirk list.

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Date:	Tue, 12 Jun 2012 07:45:17 +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 v4 3/3] usb: storage: update usb devices for write cache
 quirk in quirk list.

2012/6/11, Alan Stern <stern@...land.harvard.edu>:
> On Mon, 11 Jun 2012, Namjae Jeon wrote:
>
>> Update information of Seagate Portable HDD and WD My Passport HDD in
>> quirk list.
>>
>> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
>> Signed-off-by: Pankaj Kumar <pankaj.km@...sung.com>
>> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
>> ---
>>  drivers/usb/storage/unusual_devs.h |   24 ++++++++++++++++++++++++
>>  1 file changed, 24 insertions(+)
>>
>> diff --git a/drivers/usb/storage/unusual_devs.h
>> b/drivers/usb/storage/unusual_devs.h
>> index 1719886..64f0369 100644
>> --- a/drivers/usb/storage/unusual_devs.h
>> +++ b/drivers/usb/storage/unusual_devs.h
>> @@ -1267,6 +1267,18 @@ UNUSUAL_DEV( 0x0af0, 0xd357, 0x0000, 0x0000,
>>  		USB_SC_DEVICE, USB_PR_DEVICE, NULL,
>>  		0 ),
>>
>> +/* Reported by Namjae Jeon <namjae.jeon@...sung.com>
>> + * Even though write cache is enabled by default,
>> + * SCSI driver assume that cache is not enabled
>> + * which in turn might lead to the loss of data
>> + * since data still will be in cache.
>> + * So this entry is needed for assuming that cache is enabled.
>> + */
>
> Please remove everything except the "Reported by" line.  The rest is
> obvious when we see the US_FL_WRITE_CACHE flag.
Okay, I will remove.
Thanks~
>
>> +UNUSUAL_DEV(0x0bc2, 0x2300, 0x0000, 0x9999,
>> +		"Seagate",
>> +		"Portable HDD",
>> +		USB_SC_DEVICE, USB_PR_DEVICE, NULL, US_FL_WRITE_CACHE),
>> +
>>  /* Reported by Ben Efros <ben@...doctor.com> */
>>  UNUSUAL_DEV( 0x0bc2, 0x3010, 0x0000, 0x0000,
>>  		"Seagate",
>> @@ -1468,6 +1480,18 @@ UNUSUAL_DEV(  0x1058, 0x0704, 0x0000, 0x9999,
>>  		USB_SC_DEVICE, USB_PR_DEVICE, NULL,
>>  		US_FL_SANE_SENSE),
>>
>> +/* Reported by Namjae Jeon <namjae.jeon@...sung.com>
>> + * Even though write cache is enabled by default,
>> + * SCSI driver assume that cache is not enabled
>> + * which in turn might lead to the loss of data
>> + * since data still will be in cache.
>> + * So this entry is needed for assuming that cache is enabled.
>> + */
>
> Same here.
>
>> +UNUSUAL_DEV(0x1058, 0x070a, 0x0000, 0x9999,
>> +		"Western Digital",
>> +		"My Passport HDD",
>> +		USB_SC_DEVICE, USB_PR_DEVICE, NULL, US_FL_WRITE_CACHE),
>
> Alan Stern
>
>
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