Re: why device invoke bus reset when inmass-storageprogress?

["JackRain" <hejieming@xxxxxxxxx>]

Alan Stern,您好！

	thank you ! I have fixed this " bus reset " problem and the driver can be identified as a mass storage 
	
	in ____FULL SPEED____ mode.

    the bus reset was caused by too much __printk__ debug message  which delay the phase of SCSI command 

    then cause command time out~~~   and pc host reset device.

    I remove the printk message by "echo 0>/proc/sys/kernel/printk" ,then the mass storage can read and write.

    btw,even a printk message can slow down the speed of r/w operations.


    now ,i have another question want to ask you:  

	the device cound not work when it's in ___HIGH SPEED__ mode.

    it can be enmuated,but still go bus reset even i remove the printk message which slow down the usb speed.

    can anyone help me ??? thanks much~!

======= 2006-06-20 22:15:53 您在来信中写道：=======

>On Tue, 20 Jun 2006, JackRain wrote:
>
>> Alan Stern,您好！
>> 
>> 	thanks for your answer!
>> 
>> 	both full-speed and high-speed mode fail when processing SCSI
>> command 0x23 (which is not support by driver)
>
>g_file_storage does support command 0x23.
>
>> 
>> 	when driver receives an unsupport command ,it tell isp1582 to
>> stall the endpoint pipe.
>> 
>>     and application,which emulate the UFI protocol wait for a while ,
>> 
>>     then bus reset was captured by driver ,and re-start again~ .
>> 
>>     why the driver doesn't ___move___ after stall the pipe??
>
>Lots of UDC drivers and hardware aren't able to stall bulk pipes 
>correctly.  You can work around the problem by using the module parameter 
>"stall=n" when you load g_file_storage.
>
>Alan Stern
>

= = = = = = = = = = = = = = = = = = = =
			

　　　　　　　　致
礼！
 
				 
　　　　　　　　JackRain
　　　　　　　　hejieming@xxxxxxxxx
　　　　　　　　　　2006-06-22

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