[PATCH 5.10 059/188] i40e: Fix sparse errors in i40e_txrx.c

[Greg Kroah-Hartman]

From: Arkadiusz Kubalewski <arkadiusz.kubalew...@intel.com>

commit 12738ac4754ec92a6a45bf3677d8da780a1412b3 upstream.

Remove error handling through pointers. Instead use plain int
to return value from i40e_run_xdp(...).

Previously:
- sparse errors were produced during compilation:
i40e_txrx.c:2338 i40e_run_xdp() error: (-2147483647) too low for ERR_PTR
i40e_txrx.c:2558 i40e_clean_rx_irq() error: 'skb' dereferencing possible 
ERR_PTR()

- sk_buff* was used to return value, but it has never had valid
pointer to sk_buff. Returned value was always int handled as
a pointer.

Fixes: 0c8493d90b6b ("i40e: add XDP support for pass and drop actions")
Fixes: 2e6893123830 ("i40e: split XDP_TX tail and XDP_REDIRECT map flushing")
Signed-off-by: Aleksandr Loktionov <aleksandr.loktio...@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalew...@intel.com>
Tested-by: Dave Switzer <david.swit...@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.ngu...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2187,8 +2187,7 @@ int i40e_xmit_xdp_tx_ring(struct xdp_buf
  * @rx_ring: Rx ring being processed
  * @xdp: XDP buffer containing the frame
  **/
-static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
-                                   struct xdp_buff *xdp)
+static int i40e_run_xdp(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
 {
        int err, result = I40E_XDP_PASS;
        struct i40e_ring *xdp_ring;
@@ -2227,7 +2226,7 @@ static struct sk_buff *i40e_run_xdp(stru
        }
 xdp_out:
        rcu_read_unlock();
-       return ERR_PTR(-result);
+       return result;
 }
 
 /**
@@ -2339,6 +2338,7 @@ static int i40e_clean_rx_irq(struct i40e
        unsigned int xdp_xmit = 0;
        bool failure = false;
        struct xdp_buff xdp;
+       int xdp_res = 0;
 
 #if (PAGE_SIZE < 8192)
        xdp.frame_sz = i40e_rx_frame_truesize(rx_ring, 0);
@@ -2405,12 +2405,10 @@ static int i40e_clean_rx_irq(struct i40e
                        /* At larger PAGE_SIZE, frame_sz depend on len size */
                        xdp.frame_sz = i40e_rx_frame_truesize(rx_ring, size);
 #endif
-                       skb = i40e_run_xdp(rx_ring, &xdp);
+                       xdp_res = i40e_run_xdp(rx_ring, &xdp);
                }
 
-               if (IS_ERR(skb)) {
-                       unsigned int xdp_res = -PTR_ERR(skb);
-
+               if (xdp_res) {
                        if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR)) {
                                xdp_xmit |= xdp_res;
                                i40e_rx_buffer_flip(rx_ring, rx_buffer, size);