On Tue, Dec 09, 2014 at 04:22:35PM -0500, Dennis McLeod wrote: > need help figuring out how to make this happen. If my pci driver is > instructed to open a pci device, I want to change the mode of bar0's > sysfs node to o+rw so a user app can mmap it. > > In other words, from the driver, perform this: > chmod 766 /sys/bus/pci/[slot path]/resource0 > preferably without a lecture on why I shouldn't .. ;-) Sorry, you will get a lecture if you try to do something as foolish as this from within the kernel. If you "really" need this, do it from userspace, with a script you grant root permissions to change the mode on the files. > If I chmod that sysfs node for bar0 as root, i can run a user process > (as regular user) that does an mmap of that and can do reads/writes to > the bar resource. I would like for my pci driver to do this > automatically when it is told to open a device. Nope, that's a bad idea, and you know that as well. sorry. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
