diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2016-10-23 13:31:44 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2016-11-18 03:00:40 +0300 |
| commit | 6d30c0f728cac32ce8bf3d48ef6df485e0c641f1 (patch) | |
| tree | e3bace2927221f4e4998f88eb70c7eaf682bacf3 /drivers/gpu/drm/i2c | |
| parent | ba300c1787f793d9d6c84bb30d12b684c957f1b5 (diff) | |
| download | linux-6d30c0f728cac32ce8bf3d48ef6df485e0c641f1.tar.xz | |
drm/i2c: tda998x: avoid race in tda998x_encoder_mode_set()
As priv->audio_params can now be changed at run time, we need to be more
careful about how we deal with a mode set. We must take the audio lock
while checking if there's a valid audio configuration.
However, it's slightly worse than that - during mode set, we mute the
audio, and it must not be unmuted until we have finished the mode set.
It is possible that the audio side may start while a mode set is in
progress, so take the audio_mutex lock around the whole mode setting
procedure.
Tested-by: Jon Medhurst <tixy@linaro.org>
Acked-by: Jon Medhurst <tixy@linaro.org>
Tested-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers/gpu/drm/i2c')
| -rw-r--r-- | drivers/gpu/drm/i2c/tda998x_drv.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c index 168c0b4b8f47..9184487b10ad 100644 --- a/drivers/gpu/drm/i2c/tda998x_drv.c +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -1074,13 +1074,12 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, tda998x_write_avi(priv, adjusted_mode); - if (priv->audio_params.format != AFMT_UNUSED) { - mutex_lock(&priv->audio_mutex); + mutex_lock(&priv->audio_mutex); + if (priv->audio_params.format != AFMT_UNUSED) tda998x_configure_audio(priv, &priv->audio_params, adjusted_mode->clock); - mutex_unlock(&priv->audio_mutex); - } + mutex_unlock(&priv->audio_mutex); } } |