[PATCH 1/6] drm: prime: Honour O_RDWR during prime-handle-to-fd

Emil Velikov emil.l.velikov at gmail.com
Thu Aug 27 09:36:35 PDT 2015

Hi all,

On 27 August 2015 at 00:29, Tiago Vignatti <tiago.vignatti at intel.com> wrote:
> From: Daniel Thompson <daniel.thompson at linaro.org>
> Currently DRM_IOCTL_PRIME_HANDLE_TO_FD rejects all flags except
> (DRM|O)_CLOEXEC making it difficult (maybe impossible) for userspace
> to mmap() the resulting dma-buf even when this is supported by the
> DRM driver.
> It is trivial to relax the restriction and permit read/write access.
> This is safe because the flags are seldom touched by drm; mostly they
> are passed verbatim to dma_buf calls.
Strictly speaking shouldn't this patch be the last one in the series ?
I.e. we should lift this restriction, after the sync method
(ioctl/syscall/etc.) is in place. Or perhaps I missed something ?


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