linux-kernel - Re: [PATCH v3 3/3] usb: storage: update usb devices for write cache quirk in quirk list.

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Message-ID: <CAKYAXd9Evpo6jn+_+bnyNeaX9vmPicVp5Xm-12tp_U4=wb6Pgw@mail.gmail.com>
Date:	Sun, 10 Jun 2012 09:45:08 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	James.Bottomley@...senpartnership.com, gregkh@...uxfoundation.org,
	mdharm-usb@...-eyed-alien.net, stern@...land.harvard.edu,
	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 3/3] usb: storage: update usb devices for write cache
 quirk in quirk list.

2012/6/10, Sergei Shtylyov <sshtylyov@...sta.com>:
> Hello.
>
> On 06/09/2012 09:41 PM, 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 loss of data
>                                ^ to the
>
>> + * since data still will be in cache.
>> + * So this entry is needed for assuming that cache is enabled.
>> + */
>> +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 loss of data
>                                ^ to the
to the ? Sorry, I don't understand what you want to change.
like this ? "Even though write cache is enabled by default, SCSI
driver assume that cache is not enabled and it in turn might lead the
loss of data. "

>
> WBR, Sergei
>
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