Re: [PATCH/RFC] 2.5.42 partial fix for older pl2303

[Greg KH]

On Sun, Oct 13, 2002 at 09:17:56PM -0700, Barry K. Nathan wrote:
> 
> followed by tons of these oopses (I think it's one per LCP echo
> request/reply pair on my PPP connection but I'm not sure):
> 
> Debug: sleeping function called from illegal context at
> include/asm/semaphore.h:119
> Call Trace:
>  [<c02095f7>] serial_write+0x77/0x170
>  [<c01da4e8>] ppp_async_push+0x138/0x1c0
>  [<c01da3a5>] ppp_async_send+0x45/0x50
>  [<c01d674e>] ppp_channel_push+0x7e/0x1a0
>  [<c01d548d>] ppp_write+0xfd/0x130
>  [<c013d67d>] vfs_write+0xcd/0x140
>  [<c013d78c>] sys_write+0x3c/0x60
>  [<c01075cb>] syscall_call+0x7/0xb

Heh, I didn't think that serial_write() would sleep, but I know the
pl2303 driver could have this problem.  But it's just a warning, I know
the usb-serial drivers have some issues regarding PPP.  Check the lkml
archives for a discussion about this only a week or so ago.

> Under 2.4.20-pre10 + my 2.4 fix, the device always gets ttyUSB0, and
> always works there.

Glad this is working.

thanks,

greg k-h