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Date: Fri, 27 Jun 2008 01:32:52 -0400 From: Jeff Garzik <jeff@...zik.org> To: Kevin Hao <kexin.hao@...driver.com> CC: linux-kernel@...r.kernel.org, jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com, bruce.w.allan@...el.com, john.ronciak@...el.com, dacker@...net.com, e1000-devel@...ts.sourceforge.net, linux-arm-kernel@...ts.arm.linux.org.uk, linux-net@...r.kernel.org Subject: Re: [PATCH] e100: Do pci_dma_sync after skb_alloc for proper operation on ixp4xx Kevin Hao wrote: > Hi, > > The E100 device can't work on current kernel (2.6.26-rc6) and will cause > kernel corruption on intel ixdp4xx. This patch fix this regression. > > --- > commit c1f24812b9de182a4272724a2e84ea1ae5dd4659 > Author: Kevin Hao <kexin.hao@...driver.com> > Date: Sat Jun 21 16:50:50 2008 +0800 > > e100: Do pci_dma_sync after skb_alloc for proper operation on ixp4xx > > Do a DMA sync after we've allocated a new skb and link it with the previous > RFD. Otherwise the previous RFD may reference the previously freed skb > and cause kernel corruption. > > Previously there was such a DMA sync at this place, but it was removed > by commit 7734f6e6bcd7ba78b00e93e74a4ddafd9886cdea. > Restoring this sync operation eliminates the regression. > > Signed-off-by: Kevin Hao <kexin.hao@...driver.com> > > diff --git a/drivers/net/e100.c b/drivers/net/e100.c > index f3cba5e..1037b13 100644 > --- a/drivers/net/e100.c > +++ b/drivers/net/e100.c > @@ -1803,6 +1803,8 @@ static int e100_rx_alloc_skb(struct nic *nic, struct rx *rx) > if (rx->prev->skb) { > struct rfd *prev_rfd = (struct rfd *)rx->prev->skb->data; > put_unaligned_le32(rx->dma_addr, &prev_rfd->link); > + pci_dma_sync_single_for_device(nic->pdev, rx->prev->dma_addr, > + sizeof(struct rfd), PCI_DMA_TODEVICE); applied -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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