drm/gma500: Sanity-check pipe index

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@gmail.com>
Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450178476-26284-2-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_dpi.c b/drivers/gpu/drm/gma500/mdfld_dsi_dpi.c
index 1a1acd3cb049..7cd87a0c2385 100644
--- 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_encoder *encoder,
         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;