checkpatch: suggest using eth_zero_addr() and eth_broadcast_addr()

Suggest using eth_zero_addr() or eth_broadcast_addr() instead of memset().

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Acked-by: Joe Perches <joe@perches.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 954f4914c4af..a81fc66e62cc 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5165,6 +5165,29 @@ sub process {
                              "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n")
                 }
 
+# check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr
+# check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr
+                if ($^V && $^V ge 5.10.0 &&
+                    defined $stat &&
+                    $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
+
+                        my $ms_val = $7;
+
+                        if ($ms_val =~ /^(?:0x|)0+$/i) {
+                                if (WARN("PREFER_ETH_ZERO_ADDR",
+                                         "Prefer eth_zero_addr over memset()\n" . "$here\n$stat\n") &&
+                                    $fix) {
+                                        $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($2)/;
+                                }
+                        } elsif ($ms_val =~ /^(?:0xff|255)$/i) {
+                                if (WARN("PREFER_ETH_BROADCAST_ADDR",
+                                         "Prefer eth_broadcast_addr() over memset()\n" . "$here\n$stat\n") &&
+                                    $fix) {
+                                        $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($2)/;
+                                }
+                        }
+                }
+
 # typecasts on min/max could be min_t/max_t
                 if ($^V && $^V ge 5.10.0 &&
                     defined $stat &&