linux-kernel - Re: [PATCH 2/2] drm/fence: allow fence waiting to be interrupted by userspace

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Message-ID: <9e717fc1-e259-62ce-7e23-269c0db33f9a@linux.intel.com>
Date:	Mon, 15 Aug 2016 12:15:32 +0200
From:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To:	Gustavo Padovan <gustavo@...ovan.org>,
	dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, Daniel Stone <daniels@...labora.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	laurent.pinchart@...asonboard.com, seanpaul@...gle.com,
	marcheu@...gle.com, m.chehab@...sung.com,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH 2/2] drm/fence: allow fence waiting to be interrupted by
 userspace

Op 11-08-16 om 20:39 schreef Gustavo Padovan:
> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>
> If userspace is running an synchronously atomic commit and interrupts the
> atomic operation during fence_wait() it will hang until the timer expires,
> so here we change the wait to be interruptible so it stop immediately when
> userspace wants to quit.
>
> Also adds the necessary error checking for fence_wait().
>
> v2: Comment by Daniel Vetter
> 	- Add error checking for fence_wait()
>
> v3: Rebase on top of new atomic noblocking support
Meh, I don't like the swapped parameter much, couldn't we infer it from intr? or rename intr to swapped?
If we're not swapped yet, we should always wait interruptibly. When swapped, never..

~Maarten