From a49d1ccac97429e8864149ea7423c5f66ffa8b98 Mon Sep 17 00:00:00 2001 From: Michael Chan Date: Wed, 22 May 2019 19:12:55 -0400 Subject: [PATCH] bnxt_en: Fix possible BUG() condition when calling pci_disable_msix(). [ Upstream commit 1b3f0b75c39f534278a895c117282014e9d0ae1f ] When making configuration changes, the driver calls bnxt_close_nic() and then bnxt_open_nic() for the changes to take effect. A parameter irq_re_init is passed to the call sequence to indicate if IRQ should be re-initialized. This irq_re_init parameter needs to be included in the bnxt_reserve_rings() call. bnxt_reserve_rings() can only call pci_disable_msix() if the irq_re_init parameter is true, otherwise it may hit BUG() because some IRQs may not have been freed yet. Fixes: 41e8d7983752 ("bnxt_en: Modify the ring reservation functions for 57500 series chips.") Signed-off-by: Michael Chan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 13 +++++++------ drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 +- drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 2 +- drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c | 2 +- 4 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index d45b2f0e3063c..0229cb5243262 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -7506,22 +7506,23 @@ static void bnxt_clear_int_mode(struct bnxt *bp) bp->flags &= ~BNXT_FLAG_USING_MSIX; } -int bnxt_reserve_rings(struct bnxt *bp) +int bnxt_reserve_rings(struct bnxt *bp, bool irq_re_init) { int tcs = netdev_get_num_tc(bp->dev); - bool reinit_irq = false; + bool irq_cleared = false; int rc; if (!bnxt_need_reserve_rings(bp)) return 0; - if (BNXT_NEW_RM(bp) && (bnxt_get_num_msix(bp) != bp->total_irqs)) { + if (irq_re_init && BNXT_NEW_RM(bp) && + bnxt_get_num_msix(bp) != bp->total_irqs) { bnxt_ulp_irq_stop(bp); bnxt_clear_int_mode(bp); - reinit_irq = true; + irq_cleared = true; } rc = __bnxt_reserve_rings(bp); - if (reinit_irq) { + if (irq_cleared) { if (!rc) rc = bnxt_init_int_mode(bp); bnxt_ulp_irq_restart(bp, rc); @@ -8420,7 +8421,7 @@ static int __bnxt_open_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init) return rc; } } - rc = bnxt_reserve_rings(bp); + rc = bnxt_reserve_rings(bp, irq_re_init); if (rc) return rc; if ((bp->flags & BNXT_FLAG_RFS) && diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index 2fb653e0048da..4d8b893344723 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -1776,7 +1776,7 @@ unsigned int bnxt_get_avail_stat_ctxs_for_en(struct bnxt *bp); unsigned int bnxt_get_max_func_cp_rings(struct bnxt *bp); unsigned int bnxt_get_avail_cp_rings_for_en(struct bnxt *bp); int bnxt_get_avail_msix(struct bnxt *bp, int num); -int bnxt_reserve_rings(struct bnxt *bp); +int bnxt_reserve_rings(struct bnxt *bp, bool irq_re_init); void bnxt_tx_disable(struct bnxt *bp); void bnxt_tx_enable(struct bnxt *bp); int bnxt_hwrm_set_pause(struct bnxt *); diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c index adabbe94a259f..e1460e391952d 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c @@ -788,7 +788,7 @@ static int bnxt_set_channels(struct net_device *dev, */ } } else { - rc = bnxt_reserve_rings(bp); + rc = bnxt_reserve_rings(bp, true); } return rc; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c index ea45a9b8179e3..7dd3f445afb64 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c @@ -150,7 +150,7 @@ static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id, bnxt_close_nic(bp, true, false); rc = bnxt_open_nic(bp, true, false); } else { - rc = bnxt_reserve_rings(bp); + rc = bnxt_reserve_rings(bp, true); } } if (rc) { -- 2.47.2