From a29ba9d2d84889686a3af1c5a6023f28be75ccba Mon Sep 17 00:00:00 2001 From: Michael Chan Date: Fri, 31 Dec 2010 11:03:14 -0800 Subject: [PATCH] bnx2: Free IRQ before freeing status block memory When changing ring size, we free all memory including status block memory. If we're in INTA mode and sharing IRQ, the IRQ handler can be called and it will reference the NULL status block pointer. Because of the lockless design of the IRQ handler, there is no simple way to synchronize and prevent this. So we avoid this problem by freeing the IRQ handler before freeing the status block memory. Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/bnx2.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c index 6fa7984..44aed3b 100644 --- a/drivers/net/bnx2.c +++ b/drivers/net/bnx2.c @@ -6096,7 +6096,7 @@ bnx2_request_irq(struct bnx2 *bp) } static void -bnx2_free_irq(struct bnx2 *bp) +__bnx2_free_irq(struct bnx2 *bp) { struct bnx2_irq *irq; int i; @@ -6107,6 +6107,13 @@ bnx2_free_irq(struct bnx2 *bp) free_irq(irq->vector, &bp->bnx2_napi[i]); irq->requested = 0; } +} + +static void +bnx2_free_irq(struct bnx2 *bp) +{ + + __bnx2_free_irq(bp); if (bp->flags & BNX2_FLAG_USING_MSI) pci_disable_msi(bp->pdev); else if (bp->flags & BNX2_FLAG_USING_MSIX) @@ -7092,6 +7099,7 @@ bnx2_change_ring_size(struct bnx2 *bp, u32 rx, u32 tx) bnx2_netif_stop(bp, true); bnx2_reset_chip(bp, BNX2_DRV_MSG_CODE_RESET); + __bnx2_free_irq(bp); bnx2_free_skbs(bp); bnx2_free_mem(bp); } @@ -7104,6 +7112,9 @@ bnx2_change_ring_size(struct bnx2 *bp, u32 rx, u32 tx) rc = bnx2_alloc_mem(bp); if (!rc) + rc = bnx2_request_irq(bp); + + if (!rc) rc = bnx2_init_nic(bp, 0); if (rc) { -- 2.7.4