Hi Jonathan, I am looking at this patch of yours: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=3db633ee352bfe20d4a2b0c3c8a46ce31a6c7149 I believe that no locking is needed in i2cdev_open(). Do you have any reason to think it does? If not, can I simply revert this patch? Thanks, -- Jean Delvare