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drm/i915: Don't attempt to read an unitialized stack value 

If intel_sdvo_get_value() fails here, val is unitialized and the cross
check will compare the pipe config multiplier with a bogus value.

Instead, only set encoder_pixel_multiplier when the sdvo command has
been successful. The cross check will compare the pipe config value with
0 otherwise.

v2: Do the cross check with the initial value of encoder_pixel_multiplier (0)
if the sdvo command fails (and thus keep the warning) (Daniel Vetter)

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2013-07-12 16:24:40 +01:00 committed by Daniel Vetter
parent 08e2a7de8e
commit 53b9140849
1 changed files with 13 additions and 11 deletions
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24
drivers/gpu/drm/i915/intel_sdvo.c
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@ -1357,17 +1357,19 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
}
/* Cross check the port pixel multiplier with the sdvo encoder state. */
intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_CLOCK_RATE_MULT, &val, 1);
switch (val) {
case SDVO_CLOCK_RATE_MULT_1X:
encoder_pixel_multiplier = 1;
break;
case SDVO_CLOCK_RATE_MULT_2X:
encoder_pixel_multiplier = 2;
break;
case SDVO_CLOCK_RATE_MULT_4X:
encoder_pixel_multiplier = 4;
break;
if (intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_CLOCK_RATE_MULT,
&val, 1)) {
switch (val) {
case SDVO_CLOCK_RATE_MULT_1X:
encoder_pixel_multiplier = 1;
break;
case SDVO_CLOCK_RATE_MULT_2X:
encoder_pixel_multiplier = 2;
break;
case SDVO_CLOCK_RATE_MULT_4X:
encoder_pixel_multiplier = 4;
break;
}
}
WARN(encoder_pixel_multiplier != pipe_config->pixel_multiplier,