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

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Date:   Fri, 14 Jun 2019 17:52:10 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Bitan Biswas <bbiswas@...dia.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 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.

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
> 

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