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drm/radeon/kms/atom: fix potential oops in spread spectrum code

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Make sure we have an LVDS encoder before casting enc_priv.

[airlied: also fix two missing cpu_to_le16 casts we noticed on irc]

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2009-10-28 00:51:20 -04:00 committed by Dave Airlie
parent a2d49ae7df
commit d11aa88b33
1 changed files with 12 additions and 9 deletions
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21
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -368,14 +368,17 @@ static void atombios_set_ss(struct drm_crtc *crtc, int enable)
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc == crtc) {
radeon_encoder = to_radeon_encoder(encoder);
dig = radeon_encoder->enc_priv;
/* only enable spread spectrum on LVDS */
if (dig && dig->ss) {
percentage = dig->ss->percentage;
type = dig->ss->type;
step = dig->ss->step;
delay = dig->ss->delay;
range = dig->ss->range;
if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
dig = radeon_encoder->enc_priv;
if (dig && dig->ss) {
percentage = dig->ss->percentage;
type = dig->ss->type;
step = dig->ss->step;
delay = dig->ss->delay;
range = dig->ss->range;
} else if (enable)
return;
} else if (enable)
return;
break;
@ -387,7 +390,7 @@ static void atombios_set_ss(struct drm_crtc *crtc, int enable)
if (ASIC_IS_AVIVO(rdev)) {
memset(&args, 0, sizeof(args));
args.usSpreadSpectrumPercentage = percentage;
args.usSpreadSpectrumPercentage = cpu_to_le16(percentage);
args.ucSpreadSpectrumType = type;
args.ucSpreadSpectrumStep = step;
args.ucSpreadSpectrumDelay = delay;
@ -397,7 +400,7 @@ static void atombios_set_ss(struct drm_crtc *crtc, int enable)
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
} else {
memset(&legacy_args, 0, sizeof(legacy_args));
legacy_args.usSpreadSpectrumPercentage = percentage;
legacy_args.usSpreadSpectrumPercentage = cpu_to_le16(percentage);
legacy_args.ucSpreadSpectrumType = type;
legacy_args.ucSpreadSpectrumStepSize_Delay = (step & 3) << 2;
legacy_args.ucSpreadSpectrumStepSize_Delay |= (delay & 7) << 4;