Re: [PATCH V4 8/8] i3c: master: svc: enable the interrupt in the enable ibi function

[Miquel Raynal]

Hi Clark,

Clark Wang <xiaoning.wang@xxxxxxx> wrote on Mon,  9 Aug 2021 14:36:45
+0800:

> If enable interrupt in the svc_i3c_master_bus_init() but do not call
> enable ibi in the device driver, it will cause a kernel dump in the
> svc_i3c_master_handle_ibi() when a slave start occurs on the i3c bus,
> because the data->ibi_pool is not initialized.
> So only enable the interrupt in svc_i3c_master_enable_ibi() function.

Is this situation actually happening or is this purely theoretical?

Anyway this doesn't hurt so:

Reviewed-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>

> 
> Signed-off-by: Clark Wang <xiaoning.wang@xxxxxxx>
> ---
> V4: New patch in this patchset
> ---
>  drivers/i3c/master/svc-i3c-master.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index 77f67d407acd..b802afd8eb7d 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -569,8 +569,6 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m)
>  	if (ret)
>  		goto rpm_out;
>  
> -	svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
> -
>  rpm_out:
>  	pm_runtime_mark_last_busy(master->dev);
>  	pm_runtime_put_autosuspend(master->dev);
> @@ -1398,6 +1396,8 @@ static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
>  		return ret;
>  	}
>  
> +	svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
> +
>  	return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
>  }
>  
> @@ -1407,6 +1407,8 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
>  	struct svc_i3c_master *master = to_svc_i3c_master(m);
>  	int ret;
>  
> +	svc_i3c_master_disable_interrupts(master);
> +
>  	ret = i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
>  
>  	pm_runtime_mark_last_busy(master->dev);

Thanks,
Miquèl