Re: [PATCH] add chan->cl check in mbox_chan_received_data()

[Jassi Brar]

On Thu, Jan 7, 2021 at 5:53 AM haidong yao <yaohaidong369@xxxxxxxxx> wrote:
>
> Hi Jassi Brar
>
> Thank you very much for your reply.
>
> Look at the function sprd_mbox_outbox_isr .
>
> Chan is !NULL.
>
> chan->cl is NULL when the client driver not loaded, the controller
> driver don't know the client driver loaded successfully, so, I do not
> use mbox_free_channel.
>
> Here,How do you know chan->cl is ok?
>
The channel is supposed to get/send data _only_ if it is being used by a client.
Which you can mark in .startup() and .shutdown().

Checking for chan->cl will make your symptoms disappear but that is
not the right fix for the issue.
The right fix is to EITHER not cause Rx/Tx interrupt on a channel not
being used, OR not send it to upper layers.

thanks.