diff mbox series

[5.11,246/254] r8169: fix DMA being used after buffer free if WoL is enabled

Message ID 20210329075641.160001852@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH March 29, 2021, 7:59 a.m. UTC 
From: Heiner Kallweit <hkallweit1@gmail.com>

commit f658b90977d2e79822a558e48116e059a7e75dec upstream.

IOMMU errors have been reported if WoL is enabled and interface is
brought down. It turned out that the network chip triggers DMA
transfers after the DMA buffers have been freed. For WoL to work we
need to leave rx enabled, therefore simply stop the chip from being
a DMA busmaster.

Fixes: 567ca57faa62 ("r8169: add rtl8169_up")
Tested-by: Paul Blazejowski <paulb@blazebox.homeip.net>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/realtek/r8169_main.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4677,6 +4677,9 @@  static void rtl8169_down(struct rtl8169_
 
 	rtl8169_update_counters(tp);
 
+	pci_clear_master(tp->pci_dev);
+	rtl_pci_commit(tp);
+
 	rtl8169_cleanup(tp, true);
 
 	rtl_pll_power_down(tp);
@@ -4684,6 +4687,7 @@  static void rtl8169_down(struct rtl8169_
 
 static void rtl8169_up(struct rtl8169_private *tp)
 {
+	pci_set_master(tp->pci_dev);
 	rtl_pll_power_up(tp);
 	rtl8169_init_phy(tp);
 	napi_enable(&tp->napi);
@@ -5348,8 +5352,6 @@  static int rtl_init_one(struct pci_dev *
 
 	rtl_hw_reset(tp);
 
-	pci_set_master(pdev);
-
 	rc = rtl_alloc_irq(tp);
 	if (rc < 0) {
 		dev_err(&pdev->dev, "Can't allocate interrupt\n");