On 01/31/2018 03:36 AM, Greg Gallagher wrote: > If the device name from the device tree starts with a forward slash (/) the > rtdm device stores it in the registry including the forward slash. When we > go to use that device and do the registry lookup we use a relative path from > /dev/rtdm which doesn't contain the forward slash and fails to find a match. > Open won't return an error but IO calls will fail. To fix this when we > register an RTDM device skip the first character if it's a forward slash. > > In my case the path from the device tree is > /amba_pl/gpio@41200000/gpio905 > which gets stored in the registry. When we want to use the device and look up > the device path in the registry we use > amba_pl/gpio@41200000/gpio905 > which won't find a match in the registry. >
Good catch, thanks. > Tested on Zynq7000 gpio drivers > --- > kernel/cobalt/rtdm/device.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/kernel/cobalt/rtdm/device.c b/kernel/cobalt/rtdm/device.c > index 4533dfb..89e0815 100644 > --- a/kernel/cobalt/rtdm/device.c > +++ b/kernel/cobalt/rtdm/device.c > @@ -91,9 +91,12 @@ struct rtdm_device *__rtdm_get_namedev(const char *path) > if (strncmp(path, "rtdm/", 5) == 0) > path += 5; > > + printk(KERN_ERR "path to bind %s\n", path); Debug stuff to remove before merging. -- Philippe. _______________________________________________ Xenomai mailing list Xenomai@xenomai.org https://xenomai.org/mailman/listinfo/xenomai
