| Message ID | 20190819163144.3478-12-tbogendoerfer@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Use MFD framework for SGI IOC3 drivers | expand |
On Mon, 19 Aug 2019 18:31:34 +0200, Thomas Bogendoerfer wrote: > netif_stop_queue()/netif_wake_qeue() aren't needed for changing > multicast filters. Use spinlocks instead for proper protection > of private struct. > > Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de> > --- > drivers/net/ethernet/sgi/ioc3-eth.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c > index d862f28887f9..7f85a3bfef14 100644 > --- a/drivers/net/ethernet/sgi/ioc3-eth.c > +++ b/drivers/net/ethernet/sgi/ioc3-eth.c > @@ -1542,8 +1542,7 @@ static void ioc3_set_multicast_list(struct net_device *dev) > struct netdev_hw_addr *ha; > u64 ehar = 0; > > - netif_stop_queue(dev); /* Lock out others. */ > - > + spin_lock_irq(&ip->ioc3_lock); What does this lock protect?
On Mon, 19 Aug 2019 17:04:53 -0700 Jakub Kicinski <jakub.kicinski@netronome.com> wrote: > On Mon, 19 Aug 2019 18:31:34 +0200, Thomas Bogendoerfer wrote: > > netif_stop_queue()/netif_wake_qeue() aren't needed for changing > > multicast filters. Use spinlocks instead for proper protection > > of private struct. > > > > I thought it may protect ip->emcr, but that one is accessed with no > locking from the ioc3_timer() -> ioc3_setup_duplex() path.. it should protect ip->emcr ... I'll add spin_lock/unlock to setup_duplex and respin the patch. Thomas.
diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c index d862f28887f9..7f85a3bfef14 100644 --- a/drivers/net/ethernet/sgi/ioc3-eth.c +++ b/drivers/net/ethernet/sgi/ioc3-eth.c @@ -1542,8 +1542,7 @@ static void ioc3_set_multicast_list(struct net_device *dev) struct netdev_hw_addr *ha; u64 ehar = 0; - netif_stop_queue(dev); /* Lock out others. */ - + spin_lock_irq(&ip->ioc3_lock); if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */ ip->emcr |= EMCR_PROMISC; writel(ip->emcr, ®s->emcr); @@ -1572,7 +1571,7 @@ static void ioc3_set_multicast_list(struct net_device *dev) writel(ip->ehar_l, ®s->ehar_l); } - netif_wake_queue(dev); /* Let us get going again. */ + spin_unlock_irq(&ip->ioc3_lock); } module_pci_driver(ioc3_driver);
netif_stop_queue()/netif_wake_qeue() aren't needed for changing multicast filters. Use spinlocks instead for proper protection of private struct. Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de> --- drivers/net/ethernet/sgi/ioc3-eth.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)