Re: [Intel-gfx] [PATCH v3 7/9] drm: update global mutex lock in the ioctl handler

On Thu, Aug 19, 2021 at 12:53 PM Desmond Cheong Zhi Xi wrote: > > On 18/8/21 7:02 pm, Daniel Vetter wrote: > > On Wed, Aug 18, 2021 at 03:38:22PM +0800, Desmond Cheong Zhi Xi wrote: > >> In a future patch, a read lock on drm_device.master_rwsem is > >> held in the ioctl handler before the check fo

Re: [PATCH v3 7/9] drm: update global mutex lock in the ioctl handler

On 18/8/21 7:02 pm, Daniel Vetter wrote: On Wed, Aug 18, 2021 at 03:38:22PM +0800, Desmond Cheong Zhi Xi wrote: In a future patch, a read lock on drm_device.master_rwsem is held in the ioctl handler before the check for ioctl permissions. However, this produces the following lockdep splat:

Re: [PATCH v3 7/9] drm: update global mutex lock in the ioctl handler

On Wed, Aug 18, 2021 at 03:38:22PM +0800, Desmond Cheong Zhi Xi wrote: > In a future patch, a read lock on drm_device.master_rwsem is > held in the ioctl handler before the check for ioctl > permissions. However, this produces the following lockdep splat: > > ==

[PATCH v3 7/9] drm: update global mutex lock in the ioctl handler

In a future patch, a read lock on drm_device.master_rwsem is held in the ioctl handler before the check for ioctl permissions. However, this produces the following lockdep splat: == WARNING: possible circular locking dependency detected 5.14.0-rc