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Message-ID: <Y3NWMZwngTs/1Tn4@unreal>
Date: Tue, 15 Nov 2022 11:04:49 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Veerasenareddy Burru <vburru@...vell.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Liron Himi <lironh@...vell.com>,
Abhijit Ayarekar <aayarekar@...vell.com>,
Sathesh B Edara <sedara@...vell.com>,
Satananda Burla <sburla@...vell.com>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Subject: Re: [EXT] Re: [PATCH net-next 1/9] octeon_ep: wait for firmware ready
On Mon, Nov 14, 2022 at 08:47:42PM +0000, Veerasenareddy Burru wrote:
>
>
> > -----Original Message-----
> > From: Leon Romanovsky <leon@...nel.org>
> > Sent: Monday, November 7, 2022 12:19 AM
> > To: Veerasenareddy Burru <vburru@...vell.com>
> > Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Liron Himi
> > <lironh@...vell.com>; Abhijit Ayarekar <aayarekar@...vell.com>; Sathesh
> > B Edara <sedara@...vell.com>; Satananda Burla <sburla@...vell.com>;
> > linux-doc@...r.kernel.org; David S. Miller <davem@...emloft.net>; Eric
> > Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> > Paolo Abeni <pabeni@...hat.com>
> > Subject: [EXT] Re: [PATCH net-next 1/9] octeon_ep: wait for firmware ready
> >
> > External Email
> >
> > ----------------------------------------------------------------------
> > On Sun, Nov 06, 2022 at 11:25:15PM -0800, Veerasenareddy Burru wrote:
> > > Make driver initialize the device only after firmware is ready
> > > - add async device setup routine.
> > > - poll firmware status register.
> > > - once firmware is ready, call async device setup routine.
> >
> > Please don't do it. It is extremely hard to do it right. The proposed code that
> > has combination of atomics used as a locks together with absence of proper
> > locking from PCI and driver cores supports my claim.
> >
> > Thanks
> Leon
> What is the alternate approach you suggest here ? Are you suggesting usage of deferred probe ? the driver initialization cannot proceed till firmware ready is set by firmware.
This is what I initially thought.
Thanks
> Thanks
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