netdev - Re: [PATCH net] igb: Unset IGB_FLAG_HAS_MSIX-flag when falling back to msi-only

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Date:	Wed, 19 Feb 2014 00:05:30 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	"christoph.paasch@...ouvain.be" <christoph.paasch@...ouvain.be>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH net] igb: Unset IGB_FLAG_HAS_MSIX-flag when falling back
 to msi-only

On Wed, 2014-02-19 at 00:36 +0100, Christoph Paasch wrote:
> rior to cd14ef54d25 (igb: Change to use statically allocated array for
> MSIx entries), having msix_entries different from NULL was an
> indicator
> that MSIX is enabled.
> In igb_set_interrupt_capabiliy we may fall back to MSI-only. Prior to
> the above patch msix_entries was set to NULL by
> igb_reset_interrupt_capability.
> 
> However, now we are checking the flag for IGB_FLAG_HAS_MSIX and so the
> stack gets completly confused:
> 
> [   42.659791] ------------[ cut here ]------------
> <snip>

> [   47.892146] handlers:
> [   47.919301] [<ffffffff812fbd7d>] igb_intr
> 
> So, this patch unsets the flag to indicate that we are not using MSIX.
> This patch does exactly this: Unsetting the flag when falling back to
> MSI.
> 
> Fixes: cd14ef54d25b (igb: Change to use statically allocated array for
> MSIx entries)
> Cc: Carolyn Wyborny <carolyn.wyborny@...el.com>
> Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 1 +
>  1 file changed, 1 insertion(+) 

Thanks Christoph, I have added this to our Jeff's internal queue as
well.