Re: USB to RS485 converter unreliable with old kernel

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On Thu, 1 Oct 2009, Markus Barchfeld wrote:

> Unfortunately, updating the kernel on the MIPS device is not an
> option. So, I would try to fix the bug for 2.6.13. Therefore I have
> installed an old Ubuntu with kernel 2.6.15 on my PC and I could
> reproduce the error there. Now I guess I have to find the relevant
> changes between 2.6.15 and 2.6.28 and backport them. Of course there
> has been a lot of development taken place and I skimmed through the
> git commit messages for pl2303.c but could not identify something
> meaningful. I would be very glad if someone here would recall a change
> which could be related to the problem. Also: any hints where I should
> look in addition to pl2303.c?

There might also be changes in usb-serial.c, plus all the 
drivers/char/tty*.c files.

Alan Stern

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