diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0375-staging-bcm2835-audio-Remove-redundant-substream-mas.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0375-staging-bcm2835-audio-Remove-redundant-substream-mas.patch | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0375-staging-bcm2835-audio-Remove-redundant-substream-mas.patch b/target/linux/bcm27xx/patches-4.19/950-0375-staging-bcm2835-audio-Remove-redundant-substream-mas.patch new file mode 100644 index 0000000000..b2af97443c --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0375-staging-bcm2835-audio-Remove-redundant-substream-mas.patch @@ -0,0 +1,111 @@ +From 1120b4699738a3ee748314c433a96e45182a3411 Mon Sep 17 00:00:00 2001 +From: Takashi Iwai <tiwai@suse.de> +Date: Tue, 4 Sep 2018 17:58:33 +0200 +Subject: [PATCH] staging: bcm2835-audio: Remove redundant substream + mask checks + +commit 14b1f4cba853a11c7b381ad919622f38eb194bd7 upstream. + +The avail_substreams bit mask is checked for the possible racy +accesses, but this cannot happen in practice; i.e. the assignment and +the check are superfluous. + +Let's rip them off. + +Signed-off-by: Takashi Iwai <tiwai@suse.de> +Tested-by: Stefan Wahren <stefan.wahren@i2se.com> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + .../vc04_services/bcm2835-audio/bcm2835-ctl.c | 2 -- + .../vc04_services/bcm2835-audio/bcm2835-pcm.c | 8 -------- + .../vc04_services/bcm2835-audio/bcm2835-vchiq.c | 17 +++++++---------- + .../vc04_services/bcm2835-audio/bcm2835.c | 5 +---- + .../vc04_services/bcm2835-audio/bcm2835.h | 2 -- + 5 files changed, 8 insertions(+), 26 deletions(-) + +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c +@@ -64,8 +64,6 @@ static int snd_bcm2835_ctl_get(struct sn + + mutex_lock(&chip->audio_mutex); + +- BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK)); +- + if (kcontrol->private_value == PCM_PLAYBACK_VOLUME) + ucontrol->value.integer.value[0] = chip2alsa(chip->volume); + else if (kcontrol->private_value == PCM_PLAYBACK_MUTE) +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c +@@ -118,14 +118,6 @@ static int snd_bcm2835_playback_open_gen + goto out; + } + +- /* Check if we are ready */ +- if (!(chip->avail_substreams & (1 << idx))) { +- /* We are not ready yet */ +- audio_error("substream(%d) device is not ready yet\n", idx); +- err = -EAGAIN; +- goto out; +- } +- + alsa_stream = kzalloc(sizeof(*alsa_stream), GFP_KERNEL); + if (!alsa_stream) { + err = -ENOMEM; +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c +@@ -523,16 +523,13 @@ int bcm2835_audio_set_ctls(struct bcm283 + + /* change ctls for all substreams */ + for (i = 0; i < MAX_SUBSTREAMS; i++) { +- if (chip->avail_substreams & (1 << i)) { +- if (!chip->alsa_stream[i]) { +- LOG_DBG(" No ALSA stream available?! %i:%p (%x)\n", i, chip->alsa_stream[i], chip->avail_substreams); +- ret = 0; +- } else if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) { +- LOG_ERR("Couldn't set the controls for stream %d\n", i); +- ret = -1; +- } else { +- LOG_DBG(" Controls set for stream %d\n", i); +- } ++ if (!chip->alsa_stream[i]) ++ continue; ++ if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) { ++ LOG_ERR("Couldn't set the controls for stream %d\n", i); ++ ret = -1; ++ } else { ++ LOG_DBG(" Controls set for stream %d\n", i); + } + } + return ret; +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c +@@ -280,7 +280,7 @@ static int snd_add_child_device(struct d + struct snd_card *card; + struct device *child; + struct bcm2835_chip *chip; +- int err, i; ++ int err; + + child = snd_create_device(device, &audio_driver->driver, + audio_driver->driver.name); +@@ -325,9 +325,6 @@ static int snd_add_child_device(struct d + return err; + } + +- for (i = 0; i < numchans; i++) +- chip->avail_substreams |= (1 << i); +- + err = snd_card_register(card); + if (err) { + dev_err(child, "Failed to register card, error %d\n", err); +--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h ++++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h +@@ -98,8 +98,6 @@ struct bcm2835_chip { + struct snd_card *card; + struct snd_pcm *pcm; + struct snd_pcm *pcm_spdif; +- /* Bitmat for valid reg_base and irq numbers */ +- unsigned int avail_substreams; + struct device *dev; + struct bcm2835_alsa_stream *alsa_stream[MAX_SUBSTREAMS]; + |