From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932082AbZG1XEg (ORCPT ); Tue, 28 Jul 2009 19:04:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756007AbZG1XER (ORCPT ); Tue, 28 Jul 2009 19:04:17 -0400 Received: from kroah.org ([198.145.64.141]:43110 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755993AbZG1XEQ (ORCPT ); Tue, 28 Jul 2009 19:04:16 -0400 X-Mailbox-Line: From gregkh@mini.kroah.org Tue Jul 28 15:59:46 2009 Message-Id: <20090728225946.368524184@mini.kroah.org> User-Agent: quilt/0.48-1 Date: Tue, 28 Jul 2009 15:59:04 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Krzysztof Halasa , Jeff Kirsher , "David S. Miller" Subject: [patch 36/37] E100: work around the driver using streaming DMA mapping for RX descriptors. References: <20090728225828.431071451@mini.kroah.org> Content-Disposition: inline; filename=e100-work-around-the-driver-using-streaming-dma-mapping-for-rx-descriptors.patch In-Reply-To: <20090728230145.GA10486@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Krzysztof Halasa [ Upstream commit 303d67c288319768b19ed8dbed429fef7eb7c275 ] E100 places it's RX packet descriptors inside skb->data and uses them with bidirectional streaming DMA mapping. Unfortunately it fails to transfer skb->data ownership to the device after it reads the descriptor's status, breaking on non-coherent (e.g., ARM) platforms. This have to be converted to use coherent memory for the descriptors. Signed-off-by: Krzysztof Halasa Acked-by: Jeff Kirsher Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/e100.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/net/e100.c +++ b/drivers/net/e100.c @@ -1840,6 +1840,9 @@ static int e100_rx_indicate(struct nic * if (ioread8(&nic->csr->scb.status) & rus_no_res) nic->ru_running = RU_SUSPENDED; + pci_dma_sync_single_for_device(nic->pdev, rx->dma_addr, + sizeof(struct rfd), + PCI_DMA_BIDIRECTIONAL); return -ENODATA; }