From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: "dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Subject: [PATCH] drm/atomic: Make sure lock is held in trylock contexts.
Date: Thu, 27 Aug 2015 13:58:09 +0200 [thread overview]
Message-ID: <55DEFB51.4040507@linux.intel.com> (raw)
This will make sure we get a lockdep spat in all cases
even if the context is a complete garbage pointer.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 9abee87c1501..7c9ca2381d78 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -305,6 +305,8 @@ static inline int modeset_lock(struct drm_modeset_lock *lock,
WARN_ON(ctx->contended);
if (ctx->trylock_only) {
+ lockdep_assert_held(&ctx->ww_ctx);
+
if (!ww_mutex_trylock(&lock->mutex))
return -EBUSY;
else
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next reply other threads:[~2015-08-27 11:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-27 11:58 Maarten Lankhorst [this message]
2015-08-31 9:28 ` [PATCH] drm/atomic: Make sure lock is held in trylock contexts shuang.he
2015-09-02 9:19 ` Daniel Vetter
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