i40e: remove BUG_ON from feature string building

There's really no reason to kill the kernel thread just because of a
little info string. This reworks the code to use snprintf's limiting to
assure that the string is never too long, and WARN_ON to still put out
a warning that we might want to look at the feature list length.

Prompted by a recent Linus diatribe.

Change-ID: If52ba5ca1c2344d8bf454a31bbb805eb5d2c5802
Signed-off-by: Shannon Nelson <shannon.nelson@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_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 7715c54..7a4595a 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -10111,10 +10111,12 @@ static int i40e_setup_pf_filter_control(struct i40e_pf *pf)
 }
 
 #define INFO_STRING_LEN 255
+#define REMAIN(__x) (INFO_STRING_LEN - (__x))
 static void i40e_print_features(struct i40e_pf *pf)
 {
        struct i40e_hw *hw = &pf->hw;
        char *buf, *string;
+       int i = 0;
 
        string = kzalloc(INFO_STRING_LEN, GFP_KERNEL);
        if (!string) {
@@ -10124,42 +10126,42 @@ static void i40e_print_features(struct i40e_pf *pf)
 
        buf = string;
 
-       buf += sprintf(string, "Features: PF-id[%d] ", hw->pf_id);
+       i += snprintf(&buf[i], REMAIN(i), "Features: PF-id[%d] ", hw->pf_id);
 #ifdef CONFIG_PCI_IOV
-       buf += sprintf(buf, "VFs: %d ", pf->num_req_vfs);
+       i += snprintf(&buf[i], REMAIN(i), "VFs: %d ", pf->num_req_vfs);
 #endif
-       buf += sprintf(buf, "VSIs: %d QP: %d RX: %s ",
-                      pf->hw.func_caps.num_vsis,
-                      pf->vsi[pf->lan_vsi]->num_queue_pairs,
-                      pf->flags & I40E_FLAG_RX_PS_ENABLED ? "PS" : "1BUF");
+       i += snprintf(&buf[i], REMAIN(i), "VSIs: %d QP: %d RX: %s ",
+                     pf->hw.func_caps.num_vsis,
+                     pf->vsi[pf->lan_vsi]->num_queue_pairs,
+                     pf->flags & I40E_FLAG_RX_PS_ENABLED ? "PS" : "1BUF");
 
        if (pf->flags & I40E_FLAG_RSS_ENABLED)
-               buf += sprintf(buf, "RSS ");
+               i += snprintf(&buf[i], REMAIN(i), "RSS ");
        if (pf->flags & I40E_FLAG_FD_ATR_ENABLED)
-               buf += sprintf(buf, "FD_ATR ");
+               i += snprintf(&buf[i], REMAIN(i), "FD_ATR ");
        if (pf->flags & I40E_FLAG_FD_SB_ENABLED) {
-               buf += sprintf(buf, "FD_SB ");
-               buf += sprintf(buf, "NTUPLE ");
+               i += snprintf(&buf[i], REMAIN(i), "FD_SB ");
+               i += snprintf(&buf[i], REMAIN(i), "NTUPLE ");
        }
        if (pf->flags & I40E_FLAG_DCB_CAPABLE)
-               buf += sprintf(buf, "DCB ");
+               i += snprintf(&buf[i], REMAIN(i), "DCB ");
 #if IS_ENABLED(CONFIG_VXLAN)
-       buf += sprintf(buf, "VxLAN ");
+       i += snprintf(&buf[i], REMAIN(i), "VxLAN ");
 #endif
        if (pf->flags & I40E_FLAG_PTP)
-               buf += sprintf(buf, "PTP ");
+               i += snprintf(&buf[i], REMAIN(i), "PTP ");
 #ifdef I40E_FCOE
        if (pf->flags & I40E_FLAG_FCOE_ENABLED)
-               buf += sprintf(buf, "FCOE ");
+               i += snprintf(&buf[i], REMAIN(i), "FCOE ");
 #endif
        if (pf->flags & I40E_FLAG_VEB_MODE_ENABLED)
-               buf += sprintf(buf, "VEB ");
+               i += snprintf(&buf[i], REMAIN(i), "VEPA ");
        else
                buf += sprintf(buf, "VEPA ");
 
-       BUG_ON(buf > (string + INFO_STRING_LEN));
        dev_info(&pf->pdev->dev, "%s\n", string);
        kfree(string);
+       WARN_ON(i > INFO_STRING_LEN);
 }
 
 /**