linux-kernel - [PATCH] Limit VPD length on Atheros wifi cards

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Date:	Tue, 29 Dec 2015 16:19:02 -0600
From:	Jordan Hargrave <Jordan_Hargrave@...l.com>
To:	Jordan_Hargrave@...l.com
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	helgaas@...nel.org, alexander.duyck@...il.com,
	Jordan Hargrave <Jordan_Hargrave@...l.com>
Subject: [PATCH] Limit VPD length on Atheros wifi cards

Attempt to read VPD on these cards causes kernel hang or delay

Signed-off-by: Jordan Hargrave <Jordan_Hargrave@...l.com>
---
 drivers/pci/quirks.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e6376f6..a72667f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2161,6 +2161,16 @@ static void quirk_brcm_570x_limit_vpd(struct pci_dev *dev)
 	}
 }
 
+static void quirk_atheros_vpd(struct pci_dev *dev)
+{
+	/* Atheros WiFi cards hang when reading VPD */
+	if (dev->vpd)
+		dev->vpd->len = 0;
+}
+
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATHEROS, PCI_ANY_ID, quirk_atheros_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID, quirk_atheros_vpd);
+
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
 			PCI_DEVICE_ID_NX2_5706,
 			quirk_brcm_570x_limit_vpd);
-- 
1.7.1

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