bnxt_en: Issue PCIe FLR in kdump kernel to cleanup pending DMAs.

If crashed kernel does not shutdown the NIC properly, PCIe FLR
is required in the kdump kernel in order to initialize all the
functions properly.

Fixes: d629522e1d66 ("bnxt_en: Reduce memory usage when running in kdump kernel.")
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>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 2ad007e5ee7fd20588eefa7f8919b84585a1899c..fd6e0e48cd5187d640d4500dd86e38b0a0312681 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -11786,6 +11786,14 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
        if (version_printed++ == 0)
                pr_info("%s", version);
 
+       /* Clear any pending DMA transactions from crash kernel
+        * while loading driver in capture kernel.
+        */
+       if (is_kdump_kernel()) {
+               pci_clear_master(pdev);
+               pcie_flr(pdev);
+       }
+
        max_irqs = bnxt_get_max_irq(pdev);
        dev = alloc_etherdev_mq(sizeof(*bp), max_irqs);
        if (!dev)