netdev - RE: [Intel-wired-lan] [PATCH] igbvf: clear buffer_info->dma after dma_unmap

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Date:	Thu, 13 Aug 2015 01:48:30 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	Stefan Assmann <sassmann@...nic.de>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH] igbvf: clear buffer_info->dma after
	dma_unmap_single()

> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...ts.osuosl.org] On
> Behalf Of Stefan Assmann
> Sent: Thursday, August 06, 2015 12:32 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org; sassmann@...nic.de
> Subject: [Intel-wired-lan] [PATCH] igbvf: clear buffer_info->dma after
> dma_unmap_single()
> 
> The driver doesn't clear buffer_info->dma after calling
> dma_unmap_single() in all cases. This has been discovered by changing
> the mtu twice, which caused the following backtrace.
> 
> [   68.569280] WARNING: CPU: 2 PID: 1860 at drivers/iommu/intel-
> iommu.c:3517 intel_unmap+0x20c/0x220()
> [   68.579392] Driver unmaps unmatched page at PFN fffc2a40
> [   68.585322] Modules linked in: igbvf ipt_MASQUERADE
> nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat kvm_intel kvm igb
> megs
> [   68.599163] CPU: 2 PID: 1860 Comm: ifconfig Not tainted 4.2.0-rc4+ #147
> [   68.606543] Hardware name: IBM  -[546025Z]-/00Y7630, BIOS -[VVE134TUS-
> 1.51]- 10/17/2013
> [   68.615473]  0000000000000dbd ffff88046441bb08 ffffffff81a5ad0b
> ffffffff81e2f9ea
> [   68.623775]  ffff88046441bb58 ffff88046441bb48 ffffffff81056b55
> ffff88047fc583c0
> [   68.632075]  0000000000000000 ffff880469a8e600 00000000fffc2a40
> ffff880465b32098
> [   68.640375] Call Trace:
> [   68.643109]  [<ffffffff81a5ad0b>] dump_stack+0x48/0x5d
> [   68.648844]  [<ffffffff81056b55>] warn_slowpath_common+0x95/0xe0
> [   68.655549]  [<ffffffff81056c56>] warn_slowpath_fmt+0x46/0x70
> [   68.661960]  [<ffffffff8158a614>] ? find_iova+0x54/0x90
> [   68.667791]  [<ffffffff815988dc>] intel_unmap+0x20c/0x220
> [   68.673815]  [<ffffffff8159891e>] intel_unmap_page+0xe/0x10
> [   68.680038]  [<ffffffffa0067536>] igbvf_clean_rx_ring+0x96/0x370
> [igbvf]
> [   68.687516]  [<ffffffffa0067915>] igbvf_down+0x105/0x110 [igbvf]
> [   68.694219]  [<ffffffffa0067beb>] igbvf_change_mtu+0x16b/0x180 [igbvf]
> [...]
> 
> Signed-off-by: Stefan Assmann <sassmann@...nic.de>
> ---
>  drivers/net/ethernet/intel/igbvf/netdev.c | 1 +
>  1 file changed, 1 insertion(+)

Tested-by: Aaron Brown <aaron.f.brown@...el.com>
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