I've come across a problem with a patch that got accepted for the 2.6.8 kernel with respect to using Metricom's old Ricochet USB "modems". The 2.6.7 kernel will work with these modems, but 2.6.8 will not. What happens is that the USB device is recognized, but ACM driver, for some reason, never attaches to the device.
I tracked it down to one patch particularly; all the other patches affecting cdc-acm.c and .h can be applied except this one and the modem will still work. (There is one patch that requires that the .c file be modified to remove a bunch of local structs and defines and include the .h file instead, but that was minor.)
Specifically, there was a patch that went in with the subject "proper evaluation of the union descriptor for CDC ACM" (http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108596102223377&w=2) that, if applied to the 2.6.7 kernel, causes the behaviour I've described above.
The following four patches all work fine: http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108600512323486&w=2 http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108600898411846&w=2 http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108600974130655&w=2 http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108765608130699&w=2
I've made myself a composite patch of those four patches, and the requisite changes to cdc-acm.c in order to include cdc-acm.h, so that I can keep my gateway up and running on SuSE 9.2, at least.
Is there anything else I should be looking into? I'm not quite sure where to go next. I'm hardly a kernel hacker, or even a driver writer; I'm a programmer by trade, but I usually live up in application land. (I'm not subscribed to the list, BTW, so please CC me replies...)
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