Re: [edk2] [PATCH 2/2] efinet: fix lost packets due to active MNP instances

[Andrei Borzenkov <arvidjaar@gmail.com>]

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В Wed, 29 Apr 2015 15:47:44 +0200
Vladimir 'φ-coder/phcoder' Serbinenko <phcoder@gmail.com> пишет:

> On 25.04.2015 16:12, Andrei Borzenkov wrote:
> > ---
> >  grub-core/net/drivers/efi/efinet.c | 101 ++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 99 insertions(+), 2 deletions(-)
> > 
> > diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c
> > index f171f20..46e337a 100644
> > --- a/grub-core/net/drivers/efi/efinet.c
> > +++ b/grub-core/net/drivers/efi/efinet.c
> > @@ -142,9 +142,52 @@ get_card_packet (struct grub_net_card *dev)
> >    return nb;
> >  }
> >  
> > +static grub_err_t
> > +open_card (struct grub_net_card *dev)
> > +{
> > +  grub_efi_simple_network_t *net;
> > +
> > +  /* Try to reopen SNP exlusively to close any active MNP protocol instance
> > +     that may compete for packet polling
> > +   */
> > +  net = grub_efi_open_protocol (dev->efi_handle, &net_io_guid,
> > +				GRUB_EFI_OPEN_PROTOCOL_BY_EXCLUSIVE);
> > +  if (net)
> > +    {
> > +      if (net->mode->state == GRUB_EFI_NETWORK_STOPPED
> > +	  && efi_call_1 (net->start, net) != GRUB_EFI_SUCCESS)
> > +	return GRUB_ERR_BAD_DEVICE;
> > +
> Please use proper grub_error.
> > +      if (net->mode->state == GRUB_EFI_NETWORK_STOPPED)
> > +	return GRUB_ERR_BAD_DEVICE;
> > +
> Ditto
> > +      if (net->mode->state == GRUB_EFI_NETWORK_STARTED
> > +	  && efi_call_3 (net->initialize, net, 0, 0) != GRUB_EFI_SUCCESS)
> > +	return GRUB_ERR_BAD_DEVICE;
> > +
> Ditto
> 
> Otherwise patch looks good. If you're comfortable with it, please
> commit. Make sure to credit all relevant authors, feel free to use
> Also-By to credit several authors (AFAIU Martin as main author and you
> in Also-By)
> 

I'm not really comfortable with it, but it has been in distributions
for quite some time so I expect it to work real life. I split it in two
patches - for filtering out extra SNP devices and actual exclusive open.

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