linux-kernel - [PATCH/RFC net v2] net: dec: tulip: de2104x: Add shutdown handler to stop NIC

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Date:   Thu, 22 Oct 2020 19:45:20 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-parisc@...r.kernel.org,
        linux-kernel@...r.kernel.org, lucyyan@...gle.com,
        moritzf@...gle.com, James.Bottomley@...senpartnership.com,
        Moritz Fischer <mdf@...nel.org>
Subject: [PATCH/RFC net v2] net: dec: tulip: de2104x: Add shutdown handler to stop NIC

The driver does not implement a shutdown handler which leads to issues
when using kexec in certain scenarios. The NIC keeps on fetching
descriptors which gets flagged by the IOMMU with errors like this:

DMAR: DMAR:[DMA read] Request device [5e:00.0]fault addr fffff000
DMAR: DMAR:[DMA read] Request device [5e:00.0]fault addr fffff000
DMAR: DMAR:[DMA read] Request device [5e:00.0]fault addr fffff000
DMAR: DMAR:[DMA read] Request device [5e:00.0]fault addr fffff000
DMAR: DMAR:[DMA read] Request device [5e:00.0]fault addr fffff000

Signed-off-by: Moritz Fischer <mdf@...nel.org>
---

Changes from v1:
- Replace call to de_remove_one with de_shutdown() function
  as suggested by James.

---
 drivers/net/ethernet/dec/tulip/de2104x.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/dec/tulip/de2104x.c b/drivers/net/ethernet/dec/tulip/de2104x.c
index f1a2da15dd0a..6de0cd6cf4ca 100644
--- a/drivers/net/ethernet/dec/tulip/de2104x.c
+++ b/drivers/net/ethernet/dec/tulip/de2104x.c
@@ -2180,11 +2180,19 @@ static int de_resume (struct pci_dev *pdev)
 
 #endif /* CONFIG_PM */
 
+static void de_shutdown(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata (pdev);
+
+	de_close(dev);
+}
+
 static struct pci_driver de_driver = {
 	.name		= DRV_NAME,
 	.id_table	= de_pci_tbl,
 	.probe		= de_init_one,
 	.remove		= de_remove_one,
+	.shutdown	= de_shutdown,
 #ifdef CONFIG_PM
 	.suspend	= de_suspend,
 	.resume		= de_resume,
-- 
2.28.0