If child mailbox node status is disabled it causes
crash in interrupt handler. Fix this by assigning
only available child node during driver probe.

Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
---

Changes in v5:
  - mailbox node count should not be 0 for driver to probe

 drivers/mailbox/zynqmp-ipi-mailbox.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
index a4c8d23c76e2..ae47fbac38d2 100644
--- a/drivers/mailbox/zynqmp-ipi-mailbox.c
+++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
@@ -634,7 +634,12 @@ static int zynqmp_ipi_probe(struct platform_device *pdev)
 	struct zynqmp_ipi_mbox *mbox;
 	int num_mboxes, ret = -EINVAL;
 
-	num_mboxes = of_get_child_count(np);
+	num_mboxes = of_get_available_child_count(np);
+	if (num_mboxes == 0) {
+		dev_err(dev, "mailbox nodes not available\n");
+		return -EINVAL;
+	}
+
 	pdata = devm_kzalloc(dev, struct_size(pdata, ipi_mboxes, num_mboxes),
 			     GFP_KERNEL);
 	if (!pdata)
-- 
2.25.1

On Fri, Mar 10, 2023 at 05:24:04PM -0800, Tanmay Shah wrote:
> If child mailbox node status is disabled it causes
> crash in interrupt handler. Fix this by assigning
> only available child node during driver probe.
> 
> Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
> Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> ---
> 
> Changes in v5:
>   - mailbox node count should not be 0 for driver to probe
> 
>  drivers/mailbox/zynqmp-ipi-mailbox.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
> index a4c8d23c76e2..ae47fbac38d2 100644
> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
> @@ -634,7 +634,12 @@ static int zynqmp_ipi_probe(struct platform_device *pdev)
>  	struct zynqmp_ipi_mbox *mbox;
>  	int num_mboxes, ret = -EINVAL;
>  
> -	num_mboxes = of_get_child_count(np);
> +	num_mboxes = of_get_available_child_count(np);
> +	if (num_mboxes == 0) {
> +		dev_err(dev, "mailbox nodes not available\n");
> +		return -EINVAL;
> +	}
> +

This patchset looks good now.  I'll queue it once I get an ack from Michal.

Thanks,
Mathieu

>  	pdata = devm_kzalloc(dev, struct_size(pdata, ipi_mboxes, num_mboxes),
>  			     GFP_KERNEL);
>  	if (!pdata)
> -- 
> 2.25.1
>

On 3/13/23 20:38, Mathieu Poirier wrote:
> On Fri, Mar 10, 2023 at 05:24:04PM -0800, Tanmay Shah wrote:
>> If child mailbox node status is disabled it causes
>> crash in interrupt handler. Fix this by assigning
>> only available child node during driver probe.
>>
>> Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
>> Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
>> ---
>>
>> Changes in v5:
>>    - mailbox node count should not be 0 for driver to probe
>>
>>   drivers/mailbox/zynqmp-ipi-mailbox.c | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
>> index a4c8d23c76e2..ae47fbac38d2 100644
>> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
>> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
>> @@ -634,7 +634,12 @@ static int zynqmp_ipi_probe(struct platform_device *pdev)
>>   	struct zynqmp_ipi_mbox *mbox;
>>   	int num_mboxes, ret = -EINVAL;
>>   
>> -	num_mboxes = of_get_child_count(np);
>> +	num_mboxes = of_get_available_child_count(np);
>> +	if (num_mboxes == 0) {
>> +		dev_err(dev, "mailbox nodes not available\n");
>> +		return -EINVAL;
>> +	}
>> +
> 
> This patchset looks good now.  I'll queue it once I get an ack from Michal.

Patches 1,2,3 are acked by me already. 4,5 are remoteproc one which I am not 
testing.
If 4,5 are fine please queue them.

Thanks,
Michal

On 3/11/23 02:24, Tanmay Shah wrote:
> If child mailbox node status is disabled it causes
> crash in interrupt handler. Fix this by assigning
> only available child node during driver probe.
> 
> Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
> Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> ---
> 
> Changes in v5:
>    - mailbox node count should not be 0 for driver to probe
> 
>   drivers/mailbox/zynqmp-ipi-mailbox.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
> index a4c8d23c76e2..ae47fbac38d2 100644
> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
> @@ -634,7 +634,12 @@ static int zynqmp_ipi_probe(struct platform_device *pdev)
>   	struct zynqmp_ipi_mbox *mbox;
>   	int num_mboxes, ret = -EINVAL;
>   
> -	num_mboxes = of_get_child_count(np);
> +	num_mboxes = of_get_available_child_count(np);
> +	if (num_mboxes == 0) {
> +		dev_err(dev, "mailbox nodes not available\n");
> +		return -EINVAL;
> +	}
> +
>   	pdata = devm_kzalloc(dev, struct_size(pdata, ipi_mboxes, num_mboxes),
>   			     GFP_KERNEL);
>   	if (!pdata)

Acked-by: Michal Simek <michal.simek@amd.com>

Thanks,
Michal