linux-kernel - Re: Regarding USB-to-serial device driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 28 Sep 2010 04:30:36 -0700
From:	Greg KH <gregkh@...e.de>
To:	Raju Rameshwar Uprade <rajsingh@...a.tifr.res.in>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: Regarding USB-to-serial device driver

On Tue, Sep 28, 2010 at 02:51:57PM +0530, Raju Rameshwar Uprade wrote:
> Hello Greg,
>  
>       I am using pl2303.c ( USB to serial device driver ) to communicate to various
> devices connected in parallel using RS-485 interface card.
> 
> I am now able to separate the Address byte and data bytes.Driver send the Address byte
> properly but when it tries to send the data bytes following error occurs,
> 
> pl2303_mcm ttyUSB0: pl2303_write - failed submitting write urb, error -22.

Is this with your patched pl2303 driver, or are you now doing this from
userspace?

> I have also attached the kernel log.
> 
> /home/teleset/Desktop/USB-Serial/pl2303_mcm.c: pl2303_write before any thing - port 0, 9
> bytes 
> /home/teleset/Desktop/USB-Serial/pl2303_mcm.c: set_control_lines - value = 3, retval = 0
>  
>  Data in The BUF 0 is -----> 02 
>  
>  Data in The BUF 1 is -----> 08 
>  
>  Data in The BUF 2 is -----> 00 
>  
>  Data in The BUF 3 is -----> 00 
>  
>  Data in The BUF 4 is -----> 00 
>  
>  Data in The BUF 5 is -----> 00 
>  
>  Data in The BUF 6 is -----> 00 
>  
>  Data in The BUF 7 is -----> 00 
>  
>  Data in The BUF 8 is -----> f8 
> pl2303_mcm ttyUSB0: pl2303_write - length = 1, data = 02 
> /home/teleset/Desktop/USB-Serial/pl2303_mcm.c: After the first urb submission count =  9
> and length = 8 
> pl2303_mcm ttyUSB0: pl2303_write - length = 8, data = 08 00 00 00 00 00 00 f8 
> pl2303_mcm ttyUSB0: pl2303_write - failed submitting write urb, error -22
> /home/teleset/Desktop/USB-Serial/pl2303_mcm.c: pl2303_write_bulk_callback - port 0
> /home/teleset/Desktop/USB-Serial/pl2303_mcm.c: set_control_lines - value = 0, retval = 0

This looks like your driver, not mine, sorry, you are on your own here.
See my previous emails as to why this should be done in userspace and
not in the kernel.

good luck,

greg k-h
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/