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drm/i915: Check for fused or unused pipes 

We may have fused or unused pipes in our system. Let's check that the pipe
in question is within limits of accessible pipes. In case, that we are not
able to access the pipe, we return early with a warning.

v2: Rephrasing of the commit message (Jani)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103206
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jaswinder Singh Rajput <jaswinder@perfectintelligent.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1513584243-12607-1-git-send-email-mika.kahola@intel.com
(cherry picked from commit 0b7029b7e4)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: <stable@vger.kernel.org> # v4.10+
This commit is contained in:
Mika Kahola 2017-12-18 10:04:03 +02:00 committed by Rodrigo Vivi
parent 124804c4c4
commit 9965db26ac
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_audio.c
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@ -779,7 +779,7 @@ static struct intel_encoder *get_saved_enc(struct drm_i915_private *dev_priv,
{
struct intel_encoder *encoder;
if (WARN_ON(pipe >= INTEL_INFO(dev_priv)->num_pipes))
if (WARN_ON(pipe >= ARRAY_SIZE(dev_priv->av_enc_map)))
return NULL;
/* MST */