Hello Alexis, I found that a4l_get_chan() in buffer.c does not work for subdevices that use a global channels description struct (mode = A4L_CHAN_GLOBAL_CHANDESC in the a4l_chdesc_t structure).
The problem is that a4l_get_chan() iterates (twice) on the chan_desc array looking for channel descriptions at indexes higher than 0, also in the case where those are not populated because the subdevice uses a single channel description structure for all channels. This bug is quite bas, as it triggers a kernel oops for a integer division by zero when an a4l_cmd_t command is issued with a channels description array that does not have the channel id 0 as first acquired channel. You can easily reproduce the bug using the ni_pcimio driver, using cmd_read with the parameter -c 1. I'm looking into providing a patch, but I have some difficulties in understanding the rational of this part of analogy code... Cheers, -- Daniele _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
