linux-kernel - Re: [PATCH V2 2/2] mailbox: pcc: fix 'pcc_chan

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Date:   Fri, 11 Nov 2022 14:14:02 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Huisong Li <lihuisong@...wei.com>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, rafael.j.wysocki@...el.com,
        wanghuiqiang@...wei.com, zhangzekun11@...wei.com,
        wangxiongfeng2@...wei.com, tanxiaofei@...wei.com,
        guohanjun@...wei.com, xiexiuqi@...wei.com,
        wangkefeng.wang@...wei.com, huangdaode@...wei.com
Subject: Re: [PATCH V2 2/2] mailbox: pcc: fix 'pcc_chan_count' when fail to
 initialize PCC

Change $subject as
"mailbox: pcc: Reset pcc_chan_count to zero in case of PCC probe failure"

On Fri, Nov 11, 2022 at 10:44:48AM +0800, Huisong Li wrote:
> Currently, 'pcc_chan_count' is a non-zero value if PCC subspaces are parsed
> successfully and subsequent processes is failure during initializing PCC
> process. This may cause that pcc_mbox_request_channel() can still be
> executed successfully , which will misleads the caller that this channel is
> available.
>

I would reword this something like:
"Currently, 'pcc_chan_count' is remains set to a non-zero value if PCC
subspaces are parsed successfully but something else fail later during
the initial PCC probing phase. This will result in pcc_mbox_request_channel()
trying to access the resources that are not initialised or allocated and
may end up in a system crash.

Reset pcc_chan_count to 0 when the PCC probe fails in order to prevent
the possible issue as described above.
"

> Fixes: ce028702ddbc ("mailbox: pcc: Move bulk of PCCT parsing into pcc_mbox_probe")

Other than that,

Reviewed-by: Sudeep Holla <sudeep.holla@....com>

-- 
Regards,
Sudeep