linux-kernel - Re: [PATCH] NTB: ntb_transport: Free MWs in ntb_transport_link

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Date:   Mon, 11 Feb 2019 09:34:58 -0500
From:   Jon Mason <jdmason@...zu.us>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Joey Zhang <joey.zhang@...rochip.com>, dave.jiang@...el.com,
        allenbh@...il.com, linux-ntb@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NTB: ntb_transport: Free MWs in
 ntb_transport_link_cleanup()

On Mon, Jan 07, 2019 at 06:16:02PM -0700, Logan Gunthorpe wrote:
> 
> 
> On 06/01/19 08:12 PM, Joey Zhang wrote:
> > If NTB peer host crashes or reboots, the NTB transport link will be
> > down and the MWs of NTB transport will be invalid. But the
> > ntb_transport_link_cleanup() does not free these invalid MWs. When
> > the NTB peer host is recovered later, NTB transport link will be
> > up and the ntb_set_mw() will not reset up MWs. Because the MWs of
> > NTB transport are invalid, the NTB transport will not work.
> > 
> > We can fix it by freeing MWs when NTB transport link is down, then
> > the ntb_set_mw() will reset up MWs when NTB transport link is up.
> > 
> > Signed-off-by: Joey Zhang <joey.zhang@...rochip.com>
> 
> Looks ok to me.

Added to the ntb branch, thanks!

> Reviewed By: Logan Gunthorpe <logang@...tatee.com>

Looks like your missed the '-' ;-)
I took the liberity of adding it

Thanks,
Jon

> 
> > ---
> >  drivers/ntb/ntb_transport.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
> > index 3bfdb45..6e8902d 100644
> > --- a/drivers/ntb/ntb_transport.c
> > +++ b/drivers/ntb/ntb_transport.c
> > @@ -862,6 +862,9 @@ static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
> >  	if (!nt->link_is_up)
> >  		cancel_delayed_work_sync(&nt->link_work);
> >  
> > +	for (i = 0; i < nt->mw_count; i++)
> > +		ntb_free_mw(nt, i);
> > +
> >  	/* The scratchpad registers keep the values if the remote side
> >  	 * goes down, blast them now to give them a sane value the next
> >  	 * time they are accessed
> >