linux-kernel - Re: [PATCH 1/3] can: m_can: add deinit callback

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Message-ID: <20241114-energetic-denim-chipmunk-577438-mkl@pengutronix.de>
Date: Thu, 14 Nov 2024 10:34:23 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Simon Horman <horms@...nel.org>
Cc: Sean Nyekjaer <sean@...nix.com>, 
	Chandrasekar Ramakrishnan <rcsekar@...sung.com>, Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, linux-can@...r.kernel.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] can: m_can: add deinit callback

On 12.11.2024 14:46:03, Simon Horman wrote:
> On Mon, Nov 11, 2024 at 11:51:23AM +0100, Sean Nyekjaer wrote:
> > This is added in preparation for calling standby mode in the tcan4x5x
> > driver or other users of m_can.
> > For the tcan4x5x; If Vsup is 12V, standby mode will save 7-8mA, when
> > the interface is down.
> > 
> > Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> > ---
> >  drivers/net/can/m_can/m_can.c | 3 +++
> >  drivers/net/can/m_can/m_can.h | 1 +
> >  2 files changed, 4 insertions(+)
> > 
> > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> > index a7b3bc439ae596527493a73d62b4b7a120ae4e49..a171ff860b7c6992846ae8d615640a40b623e0cb 100644
> > --- a/drivers/net/can/m_can/m_can.c
> > +++ b/drivers/net/can/m_can/m_can.c
> > @@ -1756,6 +1756,9 @@ static void m_can_stop(struct net_device *dev)
> >  
> >  	/* set the state as STOPPED */
> >  	cdev->can.state = CAN_STATE_STOPPED;
> > +
> > +	if (cdev->ops->deinit)
> > +		cdev->ops->deinit(cdev);
> 
> Hi Sean,
> 
> Perhaps this implementation is in keeping with other m_can code, but
> I am wondering if either the return value of the callback be returned to
> the caller, or the return type of the callback be changed to void?
> 
> Similarly for calls to callbacks in in patch 3/3.

please take care of errors/return values.

Marc

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