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net: dsa: Remove VLA usage

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We avoid 2 VLAs by using a pre-allocated field in dsa_switch. We also
try to avoid dynamic allocation whenever possible (when using fewer than
bits-per-long ports, which is the common case).

Link: http://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Link: http://lkml.kernel.org/r/20180505185145.GB32630@lunn.ch
Signed-off-by: Salvatore Mesoraca <s.mesoraca16@gmail.com>
[kees: tweak commit subject and message slightly]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Salvatore Mesoraca 2018-07-16 21:10:34 -07:00 • committed by David S. Miller
parent 14260e9170
commit 0015b80abc
3 changed files with 27 additions and 12 deletions
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3
include/net/dsa.h
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@ -259,6 +259,9 @@ struct dsa_switch {
/* Number of switch port queues */
unsigned int num_tx_queues;
unsigned long *bitmap;
unsigned long _bitmap;
/* Dynamically allocated ports, keep last */
size_t num_ports;
struct dsa_port ports[];