linux-kernel - Re: [PATCH v5 1/5] mailbox: zynqmp: fix counts of child nodes

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Date:   Tue, 14 Mar 2023 08:26:49 +0100
From:   Michal Simek <michal.simek@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Tanmay Shah <tanmay.shah@....com>
Cc:     andersson@...nel.org, jaswinder.singh@...aro.org,
        ben.levinsky@....com, shubhrajyoti.datta@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH v5 1/5] mailbox: zynqmp: fix counts of child nodes



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@....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