Re: [PATCH v2] staging: pi433: add mutex fixing concurrency issues.

2018-06-07 Thread Hugo Lefeuvre
> Add a mutex fixing a potential NULL pointer dereference in the pi433 > driver. > > If pi433_release and pi433_ioctl are concurrently called, > pi433_release might set filp->private_data to NULL while pi433_ioctl > is still accessing it, leading to NULL pointer dereference. This issue > might als

How to debug video in the Linux Kernel?

2018-06-07 Thread John Whitmore
Hello all, I'm running OpenSUSE Tumbleweed so I'm just using their stock 4.16.12-1-default kernel at the moment. I'm not sure what has changed recently in their system but I'm having problems with video devices. This is a laptop with a single built in USB Camera, but for some reason two devices a