[PATCH/RFC net-next v3] net: dec: tulip: de2104x: Add shutdown handler to stop NIC

Moritz Fischer
2020-10-23T20:30:48Z

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@kernel.org>
---

I'd consider it a bug-fix but Jakub said it's a feature,
so net-next it is. I don't have a strong preference either way.

Changes from v2:
- Changed to net-next
- Removed extra whitespace

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 d9f6c19940ef..ea7442cc8e75 100644
--- a/drivers/net/ethernet/dec/tulip/de2104x.c
+++ b/drivers/net/ethernet/dec/tulip/de2104x.c
@@ -2175,11 +2175,19 @@ static int __maybe_unused de_resume(struct device *dev_d)

static SIMPLE_DEV_PM_OPS(de_pm_ops, de_suspend, de_resume);

+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,
.driver.pm = &de_pm_ops,
};

--
2.28.0