linux-kernel - Re: [PATCH v3 00/32] provide interfaces to access PCIe capabilities registers

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Date:	Tue, 21 Aug 2012 23:59:14 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Hayes Wang <hayeswang@...ltek.com>
CC:	Yu Zhao <yu.zhao@...el.com>, Dexuan Cui <dexuan.cui@...el.com>,
	Don Dutile <ddutile@...hat.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3 00/32] provide interfaces to access PCIe capabilities
 registers

Hi Bjorn,
	Thanks for your help to finalize the patchset.
	There's another suspicious issue in r8169.c, which directly writes PCI_EXP_DEVCTL_NOSNOOP_EN
to PCI_EXP_DEVCTL. I feel it should preserve other bits when setting the NOSNOOP flag.
	Regards!
	Gerry

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index b47d5b3..4104968 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5405,14 +5384,9 @@ static void rtl_hw_start_8101(struct net_device *dev)
                tp->event_slow &= ~RxFIFOOver;

        if (tp->mac_version == RTL_GIGA_MAC_VER_13 ||
-           tp->mac_version == RTL_GIGA_MAC_VER_16) {
-               int cap = pci_pcie_cap(pdev);
-
-               if (cap) {
-                       pci_write_config_word(pdev, cap + PCI_EXP_DEVCTL,
-                                             PCI_EXP_DEVCTL_NOSNOOP_EN);
-               }
-       }
+           tp->mac_version == RTL_GIGA_MAC_VER_16)
+               pcie_capability_write_word(pdev, PCI_EXP_DEVCTL,
+                                          PCI_EXP_DEVCTL_NOSNOOP_EN);

        RTL_W8(Cfg9346, Cfg9346_Unlock);
--
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