[ 57/76] drm/radeon: Dont destroy I2C Bus Rec in radeon_ext_tmds_enc_destroy().

From: Greg Kroah-Hartman
Date: Thu Oct 18 2012 - 22:53:49 EST

3.6-stable review patch. If anyone has any objections, please let me know.


From: Egbert Eich <eich@xxxxxxx>

commit 082918471139b07964967cfe5f70230909c82ae1 upstream.

radeon_i2c_fini() walks thru the list of I2C bus recs rdev->i2c_bus[]
to destroy each of them.
radeon_ext_tmds_enc_destroy() however also has code to destroy it's
associated I2C bus rec which has been obtained by radeon_i2c_lookup()
and is therefore also in the i2c_bus[] list.
This causes a double free resulting in a kernel panic when unloading
the radeon driver.
Removing destroy code from radeon_ext_tmds_enc_destroy() fixes this

agd5f: fix compiler warning

Signed-off-by: Egbert Eich <eich@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/gpu/drm/radeon/radeon_legacy_encoders.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
@@ -974,11 +974,7 @@ static void radeon_legacy_tmds_ext_mode_
static void radeon_ext_tmds_enc_destroy(struct drm_encoder *encoder)
struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
- struct radeon_encoder_ext_tmds *tmds = radeon_encoder->enc_priv;
- if (tmds) {
- if (tmds->i2c_bus)
- radeon_i2c_destroy(tmds->i2c_bus);
- }
+ /* don't destroy the i2c bus record here, this will be done in radeon_i2c_fini */

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