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Re: [linux-usb-devel] Writing big file failed when using usb gadget g_file_storage module




On Fri, 29 Jun 2007, Lonsn wrote:

> Dear all:
>  When I use the g_file_strogae.ko module, I failed to write big file to
> the disk.
> Hardware platform:
> CPU: S3C2440A
> SDRAM: 32M sdram
> Kernel:2.6.21.3 with s3c2410_udc patch
> <http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-03-usb/usb-gadget-driver-for-samsung-s3c2410-arm-soc.patch>
> 
> I plug a 256MBytes usb flashdisk(fat32 type) into the board usb host
> interface, and connect a usb line between the board usb device interface
> and a PC with WinXP OS.
> In the board side, I use the following command:
> #> insmod ./g_file_storage.ko file=/dev/sda removable=1
> where /dev/sda is the external 256MB flash disk.
> Then in the PC side, XP can recognize the board as a usb mass storage
> device. And read big file(3Mbytes) is OK.
> But when I write a big file(3Mbytes) into the board from XP side, the
> speed is very slow and finally failed. (Write a 3KBytes file is OK). In
> the board side, kernel repeatedly printed following message every
> several seconds. "g_file_storage gadget: full speed config #1".
> What's wrong with it?

To get more information, turn on the debugging options DEBUG, VERBOSE, 
and DUMP_MSGS near the start of file_storage.c.  Then post the kernel 
debugging log from the gadget.

Alan Stern


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