This is a note to let you know that I've just added the patch titled
drm/gma500: Sanity-check pipe index
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-gma500-sanity-check-pipe-index.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4f250706211cdb949f7580d4fe4dd1fd646de693 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@xxxxxxxxxx>
Date: Tue, 15 Dec 2015 12:20:49 +0100
Subject: drm/gma500: Sanity-check pipe index
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From: Thierry Reding <treding@xxxxxxxxxx>
commit 4f250706211cdb949f7580d4fe4dd1fd646de693 upstream.
If the DSI output isn't connected, then mdfld_dsi_encoder_get_pipe()
will return -1. The mdfld_dsi_dp_mode_set() function doesn't properly
check for this condition and causes the following compiler warnings:
CC drivers/gpu/drm/gma500/mdfld_dsi_dpi.o
drivers/gpu/drm/gma500/mdfld_dsi_dpi.c: In function ‘mdfld_dsi_dpi_mode_set’:
drivers/gpu/drm/gma500/mdfld_dsi_dpi.c:828:35: warning: array subscript is below array bounds [-Warray-bounds]
u32 pipeconf = dev_priv->pipeconf[pipe];
^
drivers/gpu/drm/gma500/mdfld_dsi_dpi.c:829:33: warning: array subscript is below array bounds [-Warray-bounds]
u32 dspcntr = dev_priv->dspcntr[pipe];
^
Fix this by checking for a valid pipe before indexing the pipeconf and
dspcntr arrays.
Cc: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1450178476-26284-2-git-send-email-boris.brezillon@xxxxxxxxxxxxxxxxxx
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/gma500/mdfld_dsi_dpi.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/gma500/mdfld_dsi_dpi.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_dpi.c
@@ -821,14 +821,18 @@ void mdfld_dsi_dpi_mode_set(struct drm_e
struct drm_device *dev = dsi_config->dev;
struct drm_psb_private *dev_priv = dev->dev_private;
int pipe = mdfld_dsi_encoder_get_pipe(dsi_encoder);
-
u32 pipeconf_reg = PIPEACONF;
u32 dspcntr_reg = DSPACNTR;
+ u32 pipeconf, dspcntr;
- u32 pipeconf = dev_priv->pipeconf[pipe];
- u32 dspcntr = dev_priv->dspcntr[pipe];
u32 mipi = MIPI_PORT_EN | PASS_FROM_SPHY_TO_AFE | SEL_FLOPPED_HSTX;
+ if (WARN_ON(pipe < 0))
+ return;
+
+ pipeconf = dev_priv->pipeconf[pipe];
+ dspcntr = dev_priv->dspcntr[pipe];
+
if (pipe) {
pipeconf_reg = PIPECCONF;
dspcntr_reg = DSPCCNTR;
Patches currently in stable-queue which might be from treding@xxxxxxxxxx are
queue-4.4/arm-tegra-select-usb_ulpi-from-ehci-rather-than-platform.patch
queue-4.4/drm-gma500-sanity-check-pipe-index.patch