Merge tag 'drm-intel-fixes-2014-04-04' of git://anongit.freedesktop.org/drm-intel into drm-next

 Merge window -fixes pull request as usual. Well, I did sneak in Jani's
drm_i915_private_t typedef removal, need to have fun with a big sed job
too ;-)

Otherwise:
- hdmi interlaced fixes (Jesse&Ville)
- pipe error/underrun/crc tracking fixes, regression in late 3.14-rc (but
  not cc: stable since only really relevant for igt runs)
- large cursor wm fixes (Chris)
- fix gpu turbo boost/throttle again, was getting stuck due to vlv rps
  patches (Chris+Imre)
- fix runtime pm fallout (Paulo)
- bios framebuffer inherit fix (Chris)
- a few smaller things

* tag 'drm-intel-fixes-2014-04-04' of git://anongit.freedesktop.org/drm-intel: (196 commits)
  Skip intel_crt_init for Dell XPS 8700
  drm/i915: vlv: fix RPS interrupt mask setting
  Revert "drm/i915/vlv: fixup DDR freq detection per Punit spec"
  drm/i915: move power domain init earlier during system resume
  drm/i915: Fix the computation of required fb size for pipe
  drm/i915: don't get/put runtime PM at the debugfs forcewake file
  drm/i915: fix WARNs when reading DDI state while suspended
  drm/i915: don't read cursor registers on powered down pipes
  drm/i915: get runtime PM at i915_display_info
  drm/i915: don't read pp_ctrl_reg if we're suspended
  drm/i915: get runtime PM at i915_reg_read_ioctl
  drm/i915: don't schedule force_wake_timer at gen6_read
  drm/i915: vlv: reserve the GT power context only once during driver init
  drm/i915: prefer struct drm_i915_private to drm_i915_private_t
  drm/i915/overlay: prefer struct drm_i915_private to drm_i915_private_t
  drm/i915/ringbuffer: prefer struct drm_i915_private to drm_i915_private_t
  drm/i915/display: prefer struct drm_i915_private to drm_i915_private_t
  drm/i915/irq: prefer struct drm_i915_private to drm_i915_private_t
  drm/i915/gem: prefer struct drm_i915_private to drm_i915_private_t
  drm/i915/dma: prefer struct drm_i915_private to drm_i915_private_t
  ...

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/random32.c b/lib/random32.c
index 1e5b2df44291..614896778700 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -244,8 +244,19 @@ static void __prandom_reseed(bool late)
 	static bool latch = false;
 	static DEFINE_SPINLOCK(lock);
 
+	/* Asking for random bytes might result in bytes getting
+	 * moved into the nonblocking pool and thus marking it
+	 * as initialized. In this case we would double back into
+	 * this function and attempt to do a late reseed.
+	 * Ignore the pointless attempt to reseed again if we're
+	 * already waiting for bytes when the nonblocking pool
+	 * got initialized.
+	 */
+
 	/* only allow initial seeding (late == false) once */
-	spin_lock_irqsave(&lock, flags);
+	if (!spin_trylock_irqsave(&lock, flags))
+		return;
+
 	if (latch && !late)
 		goto out;
 	latch = true;