linux-kernel - Re: [PATCH V1 2/2] mailbox: tegra: avoid resume NULL mailboxes

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Date:   Fri, 14 Jun 2019 09:16:50 -0700
From:   Bitan Biswas <bbiswas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     Jassi Brar <jassisinghbrar@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH V1 2/2] mailbox: tegra: avoid resume NULL mailboxes



On 6/14/19 8:52 AM, Thierry Reding wrote:
> On Fri, Jun 14, 2019 at 05:35:34AM -0700, Bitan Biswas wrote:
>> If Tegra hsp device tree does not have 'shared irqs',
> 
> s/hsp/HSP/, otherwise looks good.
Shall correct.

> 
> Thierry
> 
>> mailboxes pointer is NULL. Add non-NULL HSP mailboxes
>> check in resume callback before tegra_hsp_mailbox_startup()
>> call and prevent NULL pointer exception.
>>
>> Signed-off-by: Bitan Biswas <bbiswas@...dia.com>
>> ---
>>   drivers/mailbox/tegra-hsp.c | 10 ++++++----
>>   1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
>> index f147374..a11fb1c 100644
>> --- a/drivers/mailbox/tegra-hsp.c
>> +++ b/drivers/mailbox/tegra-hsp.c
>> @@ -782,11 +782,13 @@ static int __maybe_unused tegra_hsp_noirq_resume(struct device *dev)
>>   			tegra_hsp_doorbell_startup(db->channel.chan);
>>   	}
>>   
>> -	for (i = 0; i < hsp->num_sm; i++) {
>> -		struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
>> +	if (hsp->mailboxes) {
>> +		for (i = 0; i < hsp->num_sm; i++) {
>> +			struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
>>   
>> -		if (mb->channel.chan->cl)
>> -			tegra_hsp_mailbox_startup(mb->channel.chan);
>> +			if (mb->channel.chan->cl)
>> +				tegra_hsp_mailbox_startup(mb->channel.chan);
>> +		}
>>   	}
>>   
>>   	return 0;
>> -- 
>> 2.7.4

-Thanks,
  Bitan