Messages in this thread |  | | | Subject | Re: [stable] A patch in 2.6.27.9 caused device names to change | | From | Dan Williams <> | | Date | Tue, 03 Feb 2009 09:50:11 -0500 |
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On Mon, 2009-02-02 at 16:05 -0800, Greg KH wrote: > On Mon, Feb 02, 2009 at 05:02:38PM -0500, Chuck Ebbert wrote: > > This patch: > > http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git;a=blob_plain;f=releases/2.6.27.9/usb-option-add-pantech-cards.patch;hb=HEAD > > > > replaced my wireless adapter's /dev/ttyACM0 interface with three interfaces: > > /dev/ttyUSB[012] > > > > That broke my ppp connection scripts. And I have to use /dev/ttyUSB1 to connect, > > not USB0. Also it looks like Network Manager only knows how to use the first > > interface in its auto-connect mode, so people using that also lost their > > connections. > > Ugh, that sucks. > > That is what is also in upstream, so 2.6.29-rc also fails for you? > > Dan, what's with replacing working devices with the cdc-acm driver with > option device ids? Is there some reason you did this?
For a long time we've been operating under the assumption that mobile broadband devices should be driven by option and sierra, since those drivers had the necessary buffering optimizations to support higher-speed mobile broadband devices. That was true at least up until 2.6.24.
Furthermore, up until this point, I have not seen mobile broadband adapters (that aren't cellphones connected via USB) that *are* CDC-ACM compliant. Everything previously has advertised proprietary interfaces, some of which are serial ports and some of which are not.
Most mobile broadband cards *do* have more than one TTY, the others are used for additional control ports or proprietary access for stuff like GPS and flashing the firmware.
Can we get the 'lsusb -v' output for this card? I'm quite curious how many endpoints and interfaces the device actually has.
Plus, are we expected to keep device names stable these days? cdc-acm is the catch-all driver, but if that driver is more "generic" and a better driver is found, can we not update IDs just because the device name may change?
Dan
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