i40e: return immediately when failing to add fdir filter

Instead of setting err=true and checking this to determine when to free
the raw_packet near the end of the function, simply kfree and return
immediately. The resulting code is a bit cleaner and has one less
variable. This also resolves a subtle bug in the ipv4 case which could
fail to add the first filter and then never free the memory, resulting
in a small memory leak.

Change-ID: I7583aac033481dc794b4acaa14445059c8930ff1
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Avinash Dayanand <avinash.dayanand@intel.com>
Reviewed-by: Alan Brady <alan.brady@intel.com>
Reviewed-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>

1 files changed, 14 insertions, 19 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index c4d3a40a3f10..005257b4f218 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -203,7 +203,6 @@ static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
         struct i40e_pf *pf = vsi->back;
         struct udphdr *udp;
         struct iphdr *ip;
-        bool err = false;
         u8 *raw_packet;
         int ret;
         static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
@@ -230,7 +229,9 @@ static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
                 dev_info(&pf->pdev->dev,
                          "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
                          fd_data->pctype, fd_data->fd_id, ret);
-                err = true;
+                /* Free the packet buffer since it wasn't added to the ring */
+                kfree(raw_packet);
+                return -EOPNOTSUPP;
         } else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
                 if (add)
                         dev_info(&pf->pdev->dev,
@@ -241,10 +242,8 @@ static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
                                  "Filter deleted for PCTYPE %d loc = %d\n",
                                  fd_data->pctype, fd_data->fd_id);
         }
-        if (err)
-                kfree(raw_packet);
 
-        return err ? -EOPNOTSUPP : 0;
+        return 0;
 }
 
 #define I40E_TCPIP_DUMMY_PACKET_LEN 54
@@ -263,7 +262,6 @@ static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
         struct i40e_pf *pf = vsi->back;
         struct tcphdr *tcp;
         struct iphdr *ip;
-        bool err = false;
         u8 *raw_packet;
         int ret;
         /* Dummy packet */
@@ -305,12 +303,13 @@ static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
 
         fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP;
         ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
-
         if (ret) {
                 dev_info(&pf->pdev->dev,
                          "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
                          fd_data->pctype, fd_data->fd_id, ret);
-                err = true;
+                /* Free the packet buffer since it wasn't added to the ring */
+                kfree(raw_packet);
+                return -EOPNOTSUPP;
         } else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
                 if (add)
                         dev_info(&pf->pdev->dev, "Filter OK for PCTYPE %d loc = %d)\n",
@@ -321,10 +320,7 @@ static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
                                  fd_data->pctype, fd_data->fd_id);
         }
 
-        if (err)
-                kfree(raw_packet);
-
-        return err ? -EOPNOTSUPP : 0;
+        return 0;
 }
 
 #define I40E_IP_DUMMY_PACKET_LEN 34
@@ -343,7 +339,6 @@ static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
 {
         struct i40e_pf *pf = vsi->back;
         struct iphdr *ip;
-        bool err = false;
         u8 *raw_packet;
         int ret;
         int i;
@@ -365,12 +360,15 @@ static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
 
                 fd_data->pctype = i;
                 ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
-
                 if (ret) {
                         dev_info(&pf->pdev->dev,
                                  "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
                                  fd_data->pctype, fd_data->fd_id, ret);
-                        err = true;
+                        /* The packet buffer wasn't added to the ring so we
+                         * need to free it now.
+                         */
+                        kfree(raw_packet);
+                        return -EOPNOTSUPP;
                 } else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
                         if (add)
                                 dev_info(&pf->pdev->dev,
@@ -383,10 +381,7 @@ static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
                 }
         }
 
-        if (err)
-                kfree(raw_packet);
-
-        return err ? -EOPNOTSUPP : 0;
+        return 0;
 }
 
 /**