net: napi: remove useless stack trace

Whenever a buggy NAPI driver returns more than its budget,
we emit a stack trace that is of no use, since it does not
tell which driver is buggy.

Instead, emit a message giving the function name, and a
descriptive message.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 6bc2388..cea7fc1 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6683,7 +6683,9 @@ static int napi_poll(struct napi_struct *n, struct list_head *repoll)
                trace_napi_poll(n, work, weight);
        }
 
-       WARN_ON_ONCE(work > weight);
+       if (unlikely(work > weight))
+               pr_err_once("NAPI poll function %pS returned %d, exceeding its budget of %d.\n",
+                           n->poll, work, weight);
 
        if (likely(work < weight))
                goto out_unlock;