From 9965db26ac0548648309f506dc155a92daa2158f Mon Sep 17 00:00:00 2001
From: Mika Kahola <mika.kahola@intel.com>
Date: Mon, 18 Dec 2017 10:04:03 +0200
Subject: [PATCH] drm/i915: Check for fused or unused pipes
Git-commit: 9965db26ac0548648309f506dc155a92daa2158f
Patch-mainline: v4.16-rc1
References: FATE#322643 bsc#1055900
No-fix: 0b7029b7e43fda1304c181a3ade0b429b9edcd9d

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 0b7029b7e43fda1304c181a3ade0b429b9edcd9d)

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: <stable@vger.kernel.org> # v4.10+
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_audio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -779,7 +779,7 @@ static struct intel_encoder *get_saved_e
 {
 	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 */