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Message-ID: <CAPj87rPfakpstxmK3rodunVp2aX-gkLqoqQJ+gfoazaH0ej29g@mail.gmail.com> Date: Tue, 24 May 2016 09:34:50 +0200 From: Daniel Stone <daniel@...ishbar.org> To: Tomeu Vizoso <tomeu.vizoso@...labora.com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, dri-devel <dri-devel@...ts.freedesktop.org>, linux-rockchip <linux-rockchip@...ts.infradead.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event v5 On 24 May 2016 at 09:27, Tomeu Vizoso <tomeu.vizoso@...labora.com> wrote: > As per the docs, atomic_commit should return -EBUSY "if an asycnhronous > updated is requested and there is an earlier updated pending". > > v2: Use the status of the workqueue instead of vop->event, and don't add > a superfluous wait on the workqueue. > > v3: Drop work_busy, as there's a sizeable delay when the worker > finishes, which introduces a race in which the client has already > received the last flip event but the next page flip ioctl will still > return -EBUSY because work_busy returns outdated information. > > v4: Hold dev->event_lock while checking the VOP's event field as > suggested by Daniel Stone. > > v5: Only block if there's outstanding work if it's a blocking call. > > Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com> Reviewed-by: Daniel Stone <daniels@...labora.com> Cheers, Daniel
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