Re: [PATCH V2 5/8] i3c: master: Reject IBI requests from non-IBI-capable devices

[Frank Li]

On Tue, Jul 28, 2026 at 06:53:05PM +0300, Adrian Hunter wrote:
> i3c_device_request_ibi() does not verify that a device advertises IBI
> support before attempting to set up IBI handling.
>
> Add a check for I3C_BCR_IBI_REQ_CAP and fail with -EOPNOTSUPP when IBI
> support is not reported by the device.  This keeps IBI setup consistent
> with other IBI-related functionality, such as exposing wakeup capability
> only for IBI-capable devices.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---

Reviewed-by: Frank Li <Frank.Li@xxxxxxx>

>
>
> Changes in V2:
>
> 	None
>
>
>  drivers/i3c/device.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c
> index 101eaa77de68..307ca6dc04ca 100644
> --- a/drivers/i3c/device.c
> +++ b/drivers/i3c/device.c
> @@ -205,12 +205,14 @@ int i3c_device_request_ibi(struct i3c_device *dev,
>  		return ret;
>
>  	i3c_bus_normaluse_lock(dev->bus);
> -	if (dev->desc) {
> +	if (!dev->desc) {
> +		ret = -ENOENT;
> +	} else if (!(dev->desc->info.bcr & I3C_BCR_IBI_REQ_CAP)) {
> +		ret = -EOPNOTSUPP;
> +	} else {
>  		mutex_lock(&dev->desc->ibi_lock);
>  		ret = i3c_dev_request_ibi_locked(dev->desc, req);
>  		mutex_unlock(&dev->desc->ibi_lock);
> -	} else {
> -		ret = -ENOENT;
>  	}
>  	i3c_bus_normaluse_unlock(dev->bus);
>
> --
> 2.53.0
>