On 4/23/25 20:47, Leo Yan wrote:
Some CoreSight components have trace bus clocks 'atclk' and are enabled using clk_prepare_enable(). These clocks are not disabled when modules exit.
As atclk is optional, use devm_clk_get_optional_enabled() to manage it. The benefit is the driver model layer can automatically disable and release clocks.
Check the returned value with IS_ERR() to detect errors but leave the NULL pointer case if the clock is not found. And remove the error handling codes which are no longer needed.
Fixes: d1839e687773 ("coresight: etm: retrieve and handle atclk") Signed-off-by: Leo Yan leo.yan@arm.com
drivers/hwtracing/coresight/coresight-etb10.c | 10 ++++------ drivers/hwtracing/coresight/coresight-etm3x-core.c | 9 +++------ drivers/hwtracing/coresight/coresight-funnel.c | 36 +++++++++++------------------------- drivers/hwtracing/coresight/coresight-replicator.c | 34 ++++++++++------------------------ drivers/hwtracing/coresight/coresight-stm.c | 9 +++------ drivers/hwtracing/coresight/coresight-tpiu.c | 10 +++------- 6 files changed, 34 insertions(+), 74 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 7948597d483d..45c2f8f50a3f 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -730,12 +730,10 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id) if (!drvdata) return -ENOMEM;
- drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
- if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);if (ret)return ret;- }
- drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
- if (IS_ERR(drvdata->atclk))
return PTR_ERR(drvdata->atclk);- dev_set_drvdata(dev, drvdata);
/* validity for the resource is already checked by the AMBA core */ diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c index 8927bfaf3af2..adbb134f80e6 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c @@ -832,12 +832,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) spin_lock_init(&drvdata->spinlock);
- drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
- if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);if (ret)return ret;- }
- drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
- if (IS_ERR(drvdata->atclk))
return PTR_ERR(drvdata->atclk);drvdata->cpu = coresight_get_cpu(dev); if (drvdata->cpu < 0) diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c index 3fb9d0a37d55..ec6d3e656548 100644 --- a/drivers/hwtracing/coresight/coresight-funnel.c +++ b/drivers/hwtracing/coresight/coresight-funnel.c @@ -213,7 +213,6 @@ ATTRIBUTE_GROUPS(coresight_funnel); static int funnel_probe(struct device *dev, struct resource *res) {
- int ret; void __iomem *base; struct coresight_platform_data *pdata = NULL; struct funnel_drvdata *drvdata;
@@ -231,12 +230,9 @@ static int funnel_probe(struct device *dev, struct resource *res) if (!drvdata) return -ENOMEM;
- drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
- if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);if (ret)return ret;- }
- drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
- if (IS_ERR(drvdata->atclk))
return PTR_ERR(drvdata->atclk);drvdata->pclk = coresight_get_enable_apb_pclk(dev); if (IS_ERR(drvdata->pclk)) @@ -248,10 +244,8 @@ static int funnel_probe(struct device *dev, struct resource *res) */ if (res) { base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {ret = PTR_ERR(base);goto out_disable_clk;}
if (IS_ERR(base))return PTR_ERR(base);@@ -260,10 +254,9 @@ static int funnel_probe(struct device *dev, struct resource *res) dev_set_drvdata(dev, drvdata); pdata = coresight_get_platform_data(dev);
- if (IS_ERR(pdata)) {
ret = PTR_ERR(pdata);goto out_disable_clk;- }
- if (IS_ERR(pdata))
return PTR_ERR(pdata);- dev->platform_data = pdata;
raw_spin_lock_init(&drvdata->spinlock); @@ -273,17 +266,10 @@ static int funnel_probe(struct device *dev, struct resource *res) desc.pdata = pdata; desc.dev = dev; drvdata->csdev = coresight_register(&desc);
- if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);goto out_disable_clk;- }
- if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
- ret = 0;
-out_disable_clk:
- if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);- return ret;
- return 0;
} static int funnel_remove(struct device *dev) diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c index 87346617b852..460af0f7b537 100644 --- a/drivers/hwtracing/coresight/coresight-replicator.c +++ b/drivers/hwtracing/coresight/coresight-replicator.c @@ -219,7 +219,6 @@ static const struct attribute_group *replicator_groups[] = { static int replicator_probe(struct device *dev, struct resource *res) {
- int ret = 0; struct coresight_platform_data *pdata = NULL; struct replicator_drvdata *drvdata; struct coresight_desc desc = { 0 };
@@ -238,12 +237,9 @@ static int replicator_probe(struct device *dev, struct resource *res) if (!drvdata) return -ENOMEM;
- drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
- if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);if (ret)return ret;- }
- drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
- if (IS_ERR(drvdata->atclk))
return PTR_ERR(drvdata->atclk);drvdata->pclk = coresight_get_enable_apb_pclk(dev); if (IS_ERR(drvdata->pclk)) @@ -255,10 +251,8 @@ static int replicator_probe(struct device *dev, struct resource *res) */ if (res) { base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {ret = PTR_ERR(base);goto out_disable_clk;}
if (IS_ERR(base))return PTR_ERR(base);@@ -271,10 +265,8 @@ static int replicator_probe(struct device *dev, struct resource *res) dev_set_drvdata(dev, drvdata); pdata = coresight_get_platform_data(dev);
- if (IS_ERR(pdata)) {
ret = PTR_ERR(pdata);goto out_disable_clk;- }
- if (IS_ERR(pdata))
return PTR_ERR(pdata);raw_spin_lock_init(&drvdata->spinlock); @@ -285,17 +277,11 @@ static int replicator_probe(struct device *dev, struct resource *res) desc.dev = dev; drvdata->csdev = coresight_register(&desc);
- if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);goto out_disable_clk;- }
- if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);replicator_reset(drvdata);
-out_disable_clk:
- if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);- return ret;
- return 0;
} static int replicator_remove(struct device *dev) diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c index c32d0bd92f30..f13fbab4d7a2 100644 --- a/drivers/hwtracing/coresight/coresight-stm.c +++ b/drivers/hwtracing/coresight/coresight-stm.c @@ -842,12 +842,9 @@ static int __stm_probe(struct device *dev, struct resource *res) if (!drvdata) return -ENOMEM;
- drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
- if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);if (ret)return ret;- }
- drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
- if (IS_ERR(drvdata->atclk))
return PTR_ERR(drvdata->atclk);drvdata->pclk = coresight_get_enable_apb_pclk(dev); if (IS_ERR(drvdata->pclk)) diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c index 4b9634941752..cac1b5bba086 100644 --- a/drivers/hwtracing/coresight/coresight-tpiu.c +++ b/drivers/hwtracing/coresight/coresight-tpiu.c @@ -128,7 +128,6 @@ static const struct coresight_ops tpiu_cs_ops = { static int __tpiu_probe(struct device *dev, struct resource *res) {
- int ret; void __iomem *base; struct coresight_platform_data *pdata = NULL; struct tpiu_drvdata *drvdata;
@@ -144,12 +143,9 @@ static int __tpiu_probe(struct device *dev, struct resource *res) spin_lock_init(&drvdata->spinlock);
- drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
- if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);if (ret)return ret;- }
- drvdata->atclk = devm_clk_get_optional_enabled(dev, "atclk");
- if (IS_ERR(drvdata->atclk))
return PTR_ERR(drvdata->atclk);drvdata->pclk = coresight_get_enable_apb_pclk(dev); if (IS_ERR(drvdata->pclk))
LGTM
Reviewed-by: Anshuman Khandual anshuman.khandual@arm.com