linux-kernel - [PATCH v2] ehci-hcd: Disable memory-write-invalidate when the driver is removed

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Message-Id: <1451895269-4397-1-git-send-email-baijiaju1990@163.com>
Date:	Mon,  4 Jan 2016 16:14:29 +0800
From:	Jia-Ju Bai <baijiaju1990@....com>
To:	dbrownell@...rs.sourceforge.net, stern@...land.harvard.edu,
	sergei.shtylyov@...entembedded.com, gregkh@...uxfoundation.org
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH v2] ehci-hcd: Disable memory-write-invalidate when the driver is removed

The driver calls pci_set_mwi to enable memory-write-invalidate when it 
is initialized, but does not call pci_clear_mwi when it is removed. Many 
other drivers calls pci_clear_mwi when pci_set_mwi is called, such as 
r8169, 8139cp and e1000.

This patch adds a function "ehci_pci_remove" to remove the pci driver.
This function calls pci_clear_mwi and usb_hcd_pci_remove, which can 
fix the problem.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/usb/host/ehci-pci.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 2a5d2fd..3b3649d 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -377,6 +377,12 @@ static int ehci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	return usb_hcd_pci_probe(pdev, id);
 }
 
+static void ehci_pci_remove(struct pci_dev *pdev)
+{
+	pci_clear_mwi(pdev);
+	usb_hcd_pci_remove(pdev);	
+}
+
 /* PCI driver selection metadata; PCI hotplugging uses this */
 static const struct pci_device_id pci_ids [] = { {
 	/* handle any USB 2.0 EHCI controller */
@@ -396,7 +402,7 @@ static struct pci_driver ehci_pci_driver = {
 	.id_table =	pci_ids,
 
 	.probe =	ehci_pci_probe,
-	.remove =	usb_hcd_pci_remove,
+	.remove =	ehci_pci_remove,
 	.shutdown = 	usb_hcd_pci_shutdown,
 
 #ifdef CONFIG_PM
-- 
1.7.9.5


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