From: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org
[ 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@linaro.org Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Link: https://lore.kernel.org/r/20230517163750.997629-1-krzysztof.kozlowski@linaro... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soundwire/qcom.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
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; }