diff options
| author | Lino Sanfilippo <LinoSanfilippo@gmx.de> | 2014-11-30 12:56:51 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-12-06 06:33:20 +0100 |
| commit | ea589e9b7838f5d1c3d4998f9fe08854872187fc (patch) | |
| tree | 71a9c11f313c8d5e67f056c9330c882e1e15ce69 /drivers/net/ethernet/marvell/sky2.c | |
| parent | skge: Unmask interrupts in case of spurious interrupts (diff) | |
| download | linux-ea589e9b7838f5d1c3d4998f9fe08854872187fc.tar.xz linux-ea589e9b7838f5d1c3d4998f9fe08854872187fc.zip | |
sky2: avoid pci write posting after disabling irqs
In sky2_change_mtu setting B0_IMSK to 0 may be delayed due to PCI write posting
which could result in irqs being still active when synchronize_irq is called.
Since we are not prepared to handle any further irqs after synchronize_irq
(our resources are freed after that) force the write by a consecutive read from
the same register.
Similar situation in sky2_all_down: Here we disabled irqs by a write to B0_IMSK
but did not ensure that this write took place before synchronize_irq. Fix that
too.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/marvell/sky2.c')
| -rw-r--r-- | drivers/net/ethernet/marvell/sky2.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c index bd3366267039..f14544c8d73f 100644 --- a/drivers/net/ethernet/marvell/sky2.c +++ b/drivers/net/ethernet/marvell/sky2.c @@ -2419,6 +2419,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu) imask = sky2_read32(hw, B0_IMSK); sky2_write32(hw, B0_IMSK, 0); + sky2_read32(hw, B0_IMSK); dev->trans_start = jiffies; /* prevent tx timeout */ napi_disable(&hw->napi); @@ -3487,8 +3488,8 @@ static void sky2_all_down(struct sky2_hw *hw) int i; if (hw->flags & SKY2_HW_IRQ_SETUP) { - sky2_read32(hw, B0_IMSK); sky2_write32(hw, B0_IMSK, 0); + sky2_read32(hw, B0_IMSK); synchronize_irq(hw->pdev->irq); napi_disable(&hw->napi); |