| Message ID | 20201023024520.626132-1-mdf@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [PATCH/RFC,net,v2] net: dec: tulip: de2104x: Add shutdown handler to stop NIC | expand |
On Thu, 22 Oct 2020 19:45:20 -0700 Moritz Fischer wrote: > 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> Change looks good. Philosophically speaking I wonder if this is a fix or a feature. If missing .shutdown callback was a bug we shouldn't accept drivers which don't specify it :S If you don't have a strong preference I'd rather apply this to net-next. In any case - you need to respin, 'cause this does not apply to net either :) > 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); No space needed before parens > + > + 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,
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,
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> --- 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(+)