Re: [PATCH V2 2/2] mailbox: pcc: fix 'pcc_chan_count' when fail to initialize PCC

[Sudeep Holla <sudeep.holla@arm.com>]

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@arm.com>

-- 
Regards,
Sudeep