i40e: warn on double free

Down was requesting queue disables, but then exited immediately without
waiting for the queues to actually disable. This could allow any
function called after i40evf_down to run immediately, including
i40evf_up, and causes a memory leak.

This issue has been fixed in a recent refactor of the reset code, but
add a couple WARN_ONs in the slow path to help us recognize if we
reintroduce this issue or if we missed any cases.

Change-ID: I27b6b5c9a79c1892f0ba453129f116bc32647dd0
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 5e1a7dc..0d692dd 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -923,6 +923,8 @@ int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring)
        if (!dev)
                return -ENOMEM;
 
+       /* warn if we are about to overwrite the pointer */
+       WARN_ON(tx_ring->tx_bi);
        bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count;
        tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL);
        if (!tx_ring->tx_bi)
@@ -1083,6 +1085,8 @@ int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
        struct device *dev = rx_ring->dev;
        int bi_size;
 
+       /* warn if we are about to overwrite the pointer */
+       WARN_ON(rx_ring->rx_bi);
        bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count;
        rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL);
        if (!rx_ring->rx_bi)