This is a note to let you know that I've just added the patch titled
soundwire: qcom: fix unbalanced pm_runtime_put()
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
soundwire-qcom-fix-unbalanced-pm_runtime_put.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d3fa8f7ed58b0fe96e2ef113aa9fcba0580b50a6
Author: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Date: Wed May 17 18:37:49 2023 +0200
soundwire: qcom: fix unbalanced pm_runtime_put()
[ Upstream commit 9f9914b178a7935d2d94ee3e1bf55f2b42b18528 ]
This reverts commit 57ed510b0547 ("soundwire: qcom: use
pm_runtime_resume_and_get()") which introduced unbalanced
pm_runtime_put(), when device did not have runtime PM enabled.
If pm_runtime_resume_and_get() failed with -EACCES, the driver continued
execution and finally called pm_runtime_put_autosuspend(). Since
pm_runtime_resume_and_get() drops the usage counter on every error, this
lead to double decrement of that counter visible in certain debugfs
actions on unattached devices (still in reset state):
$ cat /sys/kernel/debug/soundwire/master-0-0/sdw:0:0217:f001:00:0/registers
qcom-soundwire 3210000.soundwire-controller: swrm_wait_for_wr_fifo_avail err write overflow
soundwire sdw-master-0: trf on Slave 1 failed:-5 read addr e36 count 1
soundwire sdw:0:0217:f001:00:0: Runtime PM usage count underflow!
Fixes: 57ed510b0547 ("soundwire: qcom: use pm_runtime_resume_and_get()")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230517163750.997629-1-krzysztof.kozlowski@xxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 7c75c6e3fab54..bd39e78788590 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -535,11 +535,12 @@ static irqreturn_t qcom_swrm_wake_irq_handler(int irq, void *dev_id)
struct qcom_swrm_ctrl *ctrl = dev_id;
int ret;
- ret = pm_runtime_resume_and_get(ctrl->dev);
+ ret = pm_runtime_get_sync(ctrl->dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(ctrl->dev,
- "pm_runtime_resume_and_get failed in %s, ret %d\n",
+ "pm_runtime_get_sync failed in %s, ret %d\n",
__func__, ret);
+ pm_runtime_put_noidle(ctrl->dev);
return ret;
}
@@ -1090,11 +1091,12 @@ static int qcom_swrm_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *codec_dai;
int ret, i;
- ret = pm_runtime_resume_and_get(ctrl->dev);
+ ret = pm_runtime_get_sync(ctrl->dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(ctrl->dev,
- "pm_runtime_resume_and_get failed in %s, ret %d\n",
+ "pm_runtime_get_sync failed in %s, ret %d\n",
__func__, ret);
+ pm_runtime_put_noidle(ctrl->dev);
return ret;
}
@@ -1295,11 +1297,12 @@ static int swrm_reg_show(struct seq_file *s_file, void *data)
struct qcom_swrm_ctrl *ctrl = s_file->private;
int reg, reg_val, ret;
- ret = pm_runtime_resume_and_get(ctrl->dev);
+ ret = pm_runtime_get_sync(ctrl->dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(ctrl->dev,
- "pm_runtime_resume_and_get failed in %s, ret %d\n",
+ "pm_runtime_get_sync failed in %s, ret %d\n",
__func__, ret);
+ pm_runtime_put_noidle(ctrl->dev);
return ret;
}
