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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>
This commit is contained in:
Lino Sanfilippo 2014-11-30 12:56:51 +01:00 committed by David S. Miller
parent 6276288a4c
commit ea589e9b78
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/marvell/sky2.c
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@ -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);