linux-kernel - [PATCH 2.6.30] cxgb3: clear shadow BAR registers

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Message-ID: <20090401005854.15175.44595.stgit@speedy5>
Date:	Tue, 31 Mar 2009 17:58:54 -0700
From:	Divy Le Ray <divy@...lsio.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	swise@...ngridcomputing.com
Subject: [PATCH 2.6.30] cxgb3: clear shadow BAR registers

From: Divy Le Ray <divy@...lsio.com>

Ensure that internal shadow BAR registers are cleared on 32-bit platforms.

Signed-off-by: Divy Le Ray <divy@...lsio.com>
---

 drivers/net/cxgb3/cxgb3_main.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 2c2aaa7..3f22da4 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -2984,6 +2984,20 @@ static void __devinit print_port_info(struct adapter *adap,
 	}
 }
 
+static void touch_bars(struct pci_dev *pdev)
+{
+#if BITS_PER_LONG < 64
+	u32 v;
+
+	pci_config_dword(pdev, PCI_BASE_ADDRESS_1, &v);
+	pci_write_config_dword(pdev, PCI_BASE_ADDRESS_1, v);
+	pci_read_config_dword(pdev, PCI_BASE_ADDRESS_3, &v);
+	pci_write_config_dword(pdev, PCI_BASE_ADDRESS_3, v);
+	pci_read_config_dword(pdev, PCI_BASE_ADDRESS_5, &v);
+	pci_write_config_dword(pdev, PCI_BASE_ADDRESS_5, v);
+#endif
+}
+
 static const struct net_device_ops cxgb_netdev_ops = {
 	.ndo_open		= cxgb_open,
 	.ndo_stop		= cxgb_close,
@@ -3051,6 +3065,7 @@ static int __devinit init_one(struct pci_dev *pdev,
 		goto out_disable_device;
 	}
 
+	touch_bars(pdev);
 	pci_set_master(pdev);
 	pci_save_state(pdev);
 

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