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 <[email protected]> --- drivers/net/ethernet/marvell/sky2.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c index bd33662..f14544c 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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
