From: <gregkh@linuxfoundation.org>
To: joao.goncalves@toradex.com,broonie@kernel.org,j-luthra@ti.com,peter.ujfalusi@gmail.com
Cc: <stable@vger.kernel.org>
Subject: FAILED: patch "[PATCH] ASoC: ti: davinci-mcasp: Fix race condition during probe" failed to apply to 5.4-stable tree
Date: Mon, 13 May 2024 16:00:03 +0200 [thread overview]
Message-ID: <2024051302-deluge-renovate-d904@gregkh> (raw)
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x d18ca8635db2f88c17acbdf6412f26d4f6aff414
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024051302-deluge-renovate-d904@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
d18ca8635db2 ("ASoC: ti: davinci-mcasp: Fix race condition during probe")
1b4fb70e5b28 ("ASoC: ti: davinci-mcasp: Handle missing required DT properties")
1125d925990b ("ASoC: ti: davinci-mcasp: Simplify the configuration parameter handling")
db8793a39b29 ("ASoC: ti: davinci-mcasp: Remove legacy dma_request parsing")
372c4bd11de1 ("ASoC: ti: davinci-mcasp: Use platform_get_irq_byname_optional")
19f6e424d615 ("ASoC: ti: davinci-mcasp: remove always zero of davinci_mcasp_get_dt_params")
f4d95de415b2 ("ASoC: ti: davinci-mcasp: remove redundant assignment to variable ret")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d18ca8635db2f88c17acbdf6412f26d4f6aff414 Mon Sep 17 00:00:00 2001
From: Joao Paulo Goncalves <joao.goncalves@toradex.com>
Date: Wed, 17 Apr 2024 15:41:38 -0300
Subject: [PATCH] ASoC: ti: davinci-mcasp: Fix race condition during probe
When using davinci-mcasp as CPU DAI with simple-card, there are some
conditions that cause simple-card to finish registering a sound card before
davinci-mcasp finishes registering all sound components. This creates a
non-working sound card from userspace with no problem indication apart
from not being able to play/record audio on a PCM stream. The issue
arises during simultaneous probe execution of both drivers. Specifically,
the simple-card driver, awaiting a CPU DAI, proceeds as soon as
davinci-mcasp registers its DAI. However, this process can lead to the
client mutex lock (client_mutex in soc-core.c) being held or davinci-mcasp
being preempted before PCM DMA registration on davinci-mcasp finishes.
This situation occurs when the probes of both drivers run concurrently.
Below is the code path for this condition. To solve the issue, defer
davinci-mcasp CPU DAI registration to the last step in the audio part of
it. This way, simple-card CPU DAI parsing will be deferred until all
audio components are registered.
Fail Code Path:
simple-card.c: probe starts
simple-card.c: simple_dai_link_of: simple_parse_node(..,cpu,..) returns EPROBE_DEFER, no CPU DAI yet
davinci-mcasp.c: probe starts
davinci-mcasp.c: devm_snd_soc_register_component() register CPU DAI
simple-card.c: probes again, finish CPU DAI parsing and call devm_snd_soc_register_card()
simple-card.c: finish probe
davinci-mcasp.c: *dma_pcm_platform_register() register PCM DMA
davinci-mcasp.c: probe finish
Cc: stable@vger.kernel.org
Fixes: 9fbd58cf4ab0 ("ASoC: davinci-mcasp: Choose PCM driver based on configured DMA controller")
Signed-off-by: Joao Paulo Goncalves <joao.goncalves@toradex.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Reviewed-by: Jai Luthra <j-luthra@ti.com>
Link: https://lore.kernel.org/r/20240417184138.1104774-1-jpaulo.silvagoncalves@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/ti/davinci-mcasp.c b/sound/soc/ti/davinci-mcasp.c
index b892d66f7847..1e760c315521 100644
--- a/sound/soc/ti/davinci-mcasp.c
+++ b/sound/soc/ti/davinci-mcasp.c
@@ -2417,12 +2417,6 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
mcasp_reparent_fck(pdev);
- ret = devm_snd_soc_register_component(&pdev->dev, &davinci_mcasp_component,
- &davinci_mcasp_dai[mcasp->op_mode], 1);
-
- if (ret != 0)
- goto err;
-
ret = davinci_mcasp_get_dma_type(mcasp);
switch (ret) {
case PCM_EDMA:
@@ -2449,6 +2443,12 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
goto err;
}
+ ret = devm_snd_soc_register_component(&pdev->dev, &davinci_mcasp_component,
+ &davinci_mcasp_dai[mcasp->op_mode], 1);
+
+ if (ret != 0)
+ goto err;
+
no_audio:
ret = davinci_mcasp_init_gpiochip(mcasp);
if (ret) {
reply other threads:[~2024-05-13 14:00 UTC|newest]
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