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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Thierry Reding <treding@nvidia.com>,
	John Stultz <john.stultz@linaro.org>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH 05/13] drm/fb-helper: Drop locking from the vsync wait ioctl code
Date: Tue,  4 Jul 2017 17:18:25 +0200	[thread overview]
Message-ID: <20170704151833.17304-6-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <20170704151833.17304-1-daniel.vetter@ffwll.ch>

Like with the drm-native vblank wait ioctl we can entirely rely on the
spinlocks in drm_vblank.c, no need at all to take expensive mutexes.
The only reason we had to take mode_config.mutex was to protect the
fbdev helper's data-structures, but that's now done by
fb_helper->lock.

Cc: John Stultz <john.stultz@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 14b3f885a01f..13330c22e6bf 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1342,7 +1342,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 		goto unlock;
 	}
 
-	mutex_lock(&dev->mode_config.mutex);
 	switch (cmd) {
 	case FBIO_WAITFORVSYNC:
 		/*
@@ -1382,7 +1381,6 @@ int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 	}
 
 unlock:
-	mutex_unlock(&dev->mode_config.mutex);
 	mutex_unlock(&fb_helper->lock);
 	return ret;
 }
-- 
2.13.2

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  parent reply	other threads:[~2017-07-04 15:18 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-04 15:18 [PATCH 00/13] fbdev locking + deferred setup take 3 Daniel Vetter
2017-07-04 15:18 ` [PATCH 01/13] drm/fb-helper: Push down modeset lock into FB helpers Daniel Vetter
2017-07-04 15:18 ` [PATCH 02/13] drm/i915: Drop FBDEV #ifdev in mst code Daniel Vetter
2017-07-04 15:18 ` [PATCH 03/13] drm/fb-helper: Add top-level lock Daniel Vetter
2017-07-04 15:18 ` [PATCH 04/13] drm/fb-helper: Push locking in fb_is_bound Daniel Vetter
2017-07-04 15:18 ` Daniel Vetter [this message]
2017-07-04 15:18 ` [PATCH 06/13] drm/fb-helper: Push locking into pan_display_atomic|legacy Daniel Vetter
2017-07-04 15:18 ` [PATCH 07/13] drm/fb-helper: Push locking into restore_fbdev_mode_atomic|legacy Daniel Vetter
2017-07-04 15:18 ` [PATCH 08/13] drm/fb-helper: Stop using mode_config.mutex for internals Daniel Vetter
2017-07-04 15:40   ` Ville Syrjälä
2017-07-04 16:19     ` Daniel Vetter
2017-07-05  4:56   ` [PATCH] " Daniel Vetter
2017-07-04 15:18 ` [PATCH 09/13] drm/fb-helper: Split dpms handling into legacy and atomic paths Daniel Vetter
2017-07-04 15:18 ` [PATCH 10/13] drm/fb-helper: Support deferred setup Daniel Vetter
2017-07-04 15:29   ` Liviu Dudau
2017-07-05 11:20   ` Maarten Lankhorst
2017-07-04 15:18 ` [PATCH 11/13] drm/i915: Protect against deferred fbdev setup Daniel Vetter
2017-07-05 10:08   ` Maarten Lankhorst
2017-07-05 20:17     ` Daniel Vetter
2017-07-04 15:18 ` [PATCH 12/13] drm/exynos: Remove custom FB helper deferred setup Daniel Vetter
2017-07-06  3:16   ` Inki Dae
2017-07-04 15:18 ` [PATCH 13/13] drm/hisilicon: " Daniel Vetter
2017-07-04 16:39 ` ✓ Fi.CI.BAT: success for fbdev locking + deferred setup take 3 Patchwork
2017-07-05  5:14 ` ✓ Fi.CI.BAT: success for fbdev locking + deferred setup take 3 (rev2) Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2017-06-27 14:59 [PATCH 00/13] fbdev locking rework and deferred setup, take 2 Daniel Vetter
2017-06-27 14:59 ` [PATCH 05/13] drm/fb-helper: Drop locking from the vsync wait ioctl code Daniel Vetter

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