bnxt_en: reinitialize IRQs when MTU is modified

[ Upstream commit 6eb554f9c42e178725e119407742072f5304fd01 ]

MTU changes may affect the number of IRQs so we must call
bnxt_close_nic()/bnxt_open_nic() with the irq_re_init parameter
set to true.  The reason is that a larger MTU may require
aggregation rings not needed with smaller MTU.  We may not be
able to allocate the required number of aggregation rings and
so we reduce the number of channels which will change the number
of IRQs.  Without this patch, it may crash eventually in
pci_disable_msix() when the IRQs are not properly unwound.

Fixes: dfe047769e71 ("bnxt_en: New Broadcom ethernet driver.")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 374e11a91790ba672ca2bda753ba0248cf691be9..57c88e157f8666ec9a614b556cf5f87d8161b0e2 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10891,13 +10891,13 @@ static int bnxt_change_mtu(struct net_device *dev, int new_mtu)
        struct bnxt *bp = netdev_priv(dev);
 
        if (netif_running(dev))
-               bnxt_close_nic(bp, false, false);
+               bnxt_close_nic(bp, true, false);
 
        dev->mtu = new_mtu;
        bnxt_set_ring_params(bp);
 
        if (netif_running(dev))
-               return bnxt_open_nic(bp, false, false);
+               return bnxt_open_nic(bp, true, false);
 
        return 0;
 }