From 29365c900963d4986b74a0dadea46872bf283d76 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Fri, 1 Sep 2006 15:53:48 -0700 Subject: [PATCH] [PATCH] skge: irq lock race The driver needs to access the IRQ status inside of lock to avoid races with other places changing IRQ mask etc. This may be related to some of the SMP bugs reported against skge in kernel bugzilla. Signed-off-by: Stephen Hemminger Signed-off-by: Jeff Garzik --- drivers/net/skge.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/skge.c b/drivers/net/skge.c index e86a88aa9d06..8a321be24835 100644 --- a/drivers/net/skge.c +++ b/drivers/net/skge.c @@ -2891,13 +2891,15 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs) { struct skge_hw *hw = dev_id; u32 status; + int handled = 0; + spin_lock(&hw->hw_lock); /* Reading this register masks IRQ */ status = skge_read32(hw, B0_SP_ISRC); if (status == 0) - return IRQ_NONE; + goto out; - spin_lock(&hw->hw_lock); + handled = 1; status &= hw->intr_mask; if (status & IS_EXT_REG) { hw->intr_mask &= ~IS_EXT_REG; @@ -2959,9 +2961,10 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs) skge_write32(hw, B0_IMSK, hw->intr_mask); skge_read32(hw, B0_IMSK); +out: spin_unlock(&hw->hw_lock); - return IRQ_HANDLED; + return IRQ_RETVAL(handled); } #ifdef CONFIG_NET_POLL_CONTROLLER -- 2.20.1