On Fri, Oct 26, 2012 at 04:06:27PM +0200, Laurent Pinchart wrote: > Hi Thierry, > > Thank you for the patch, and sorry for the late reply. > > On Monday 15 October 2012 20:03:42 Thierry Reding wrote: > > Platform device drivers usually use the driver-private data for their > > own purposes. Having it overwritten by drm_platform_init() is confusing > > and error-prone. > > If you want to push drivers that way, you should get rid of the > pci_set_drvdata() call in core DRM as well. This would push device driver data > handling down to all drivers, so I'm not convinced it would actually make > things simpler. I think the problem doesn't exist for PCI-based DRM drivers, so I didn't look at it. The issue only arises once the DRM needs to glue together multiple devices, as is usual with the drivers for embedded devices, where the drivers are based on platform devices. I agree, though, that for consistency it would be nicer not to do this for the PCI-based DRM drivers either. If David agrees I can take a look at converting the other drivers along with the change to the DRM core. Pushing the handling of the driver-private data down to the drivers may not make things easier, but at least it would be consistent with other drivers. I didn't mention this in the patch description but it actually took me a day to track down why the driver kept crashing until I figured out that drm_platform_init() actually modified the pointer. Thierry
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