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networking: add and use skb_put_u8()

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Joe and Bjørn suggested that it'd be nicer to not have the
cast in the fairly common case of doing
	*(u8 *)skb_put(skb, 1) = c;

Add skb_put_u8() for this case, and use it across the code,
using the following spatch:

    @@
    expression SKB, C, S;
    typedef u8;
    identifier fn = {skb_put};
    fresh identifier fn2 = fn ## "_u8";
    @@
    - *(u8 *)fn(SKB, S) = C;
    + fn2(SKB, C);

Note that due to the "S", the spatch isn't perfect, it should
have checked that S is 1, but there's also places that use a
sizeof expression like sizeof(var) or sizeof(u8) etc. Turns
out that nobody ever did something like
	*(u8 *)skb_put(skb, 2) = c;

which would be wrong anyway since the second byte wouldn't be
initialized.

Suggested-by: Joe Perches <joe@perches.com>
Suggested-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2017-06-16 14:29:24 +02:00
committed by David S. Miller
parent d58ff35122
commit 634fef6107
39 changed files with 106 additions and 100 deletions
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4
drivers/nfc/microread/i2c.c
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@@ -75,7 +75,7 @@ static void microread_i2c_add_len_crc(struct sk_buff *skb)
for (i = 0; i < skb->len; i++)
crc = crc ^ skb->data[i];
*(u8 *)skb_put(skb, 1) = crc;
skb_put_u8(skb, crc);
}
static void microread_i2c_remove_len_crc(struct sk_buff *skb)
@@ -173,7 +173,7 @@ static int microread_i2c_read(struct microread_i2c_phy *phy,
goto flush;
}
*(u8 *)skb_put(*skb, 1) = len;
skb_put_u8(*skb, len);
r = i2c_master_recv(client, skb_put(*skb, len), len);
if (r != len) {