On Thu, Jun 20, 2019 at 07:15:47PM +0530, Sai Prakash Ranjan wrote:
> Currently the coresight etm and cpu-debug drivers
> assume the affinity to CPU0 returned by coresight
> platform and continue the probe in case of missing
> CPU phandle. This is not true and leads to crash
> in some cases, so abort the probe in case of missing
> CPU phandle.
>
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
> ---
> drivers/hwtracing/coresight/coresight-cpu-debug.c | 3 +++
> drivers/hwtracing/coresight/coresight-etm3x.c | 3 +++
> drivers/hwtracing/coresight/coresight-etm4x.c | 3 +++
> 3 files changed, 9 insertions(+)
>
> diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> index 07a1367c733f..43f32fa71ff9 100644
> --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
> +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> @@ -579,6 +579,9 @@ static int debug_probe(struct amba_device *adev, const struct amba_id *id)
> return -ENOMEM;
>
> drvdata->cpu = coresight_get_cpu(dev);
> + if (drvdata->cpu == -ENODEV)
> + return -ENODEV;
As Suzuki pointed out, simply return the error message conveyed by
coresight_get_cpu().
Also please merge both patches together to avoid bisect nightmare.
Thank you for the contribution,
Mathieu
> +
> if (per_cpu(debug_drvdata, drvdata->cpu)) {
> dev_err(dev, "CPU%d drvdata has already been initialized\n",
> drvdata->cpu);
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index 225c2982e4fe..882e2751746c 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -816,6 +816,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> }
>
> drvdata->cpu = coresight_get_cpu(dev);
> + if (drvdata->cpu == -ENODEV)
> + return -ENODEV;
> +
> desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> if (!desc.name)
> return -ENOMEM;
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 7fe266194ab5..97d71dbbeb19 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1101,6 +1101,9 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> spin_lock_init(&drvdata->spinlock);
>
> drvdata->cpu = coresight_get_cpu(dev);
> + if (drvdata->cpu == -ENODEV)
> + return -ENODEV;
> +
> desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> if (!desc.name)
> return -ENOMEM;
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
