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65dc2f1a44
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/*
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* This file is part of the Chelsio T4 Ethernet driver for Linux.
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* Copyright (C) 2003-2014 Chelsio Communications. All rights reserved.
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*
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* Written by Deepak (deepak.s@chelsio.com)
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
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* release for licensing terms and conditions.
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*/
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#include <linux/refcount.h>
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struct clip_entry {
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spinlock_t lock; /* Hold while modifying clip reference */
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refcount_t refcnt;
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struct list_head list;
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union {
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struct sockaddr_in addr;
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struct sockaddr_in6 addr6;
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};
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};
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struct clip_tbl {
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unsigned int clipt_start;
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unsigned int clipt_size;
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rwlock_t lock;
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atomic_t nfree;
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struct list_head ce_free_head;
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void *cl_list;
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struct list_head hash_list[];
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};
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enum {
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CLIPT_MIN_HASH_BUCKETS = 2,
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};
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struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
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unsigned int clipt_end);
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int cxgb4_clip_get(const struct net_device *dev, const u32 *lip, u8 v6);
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void cxgb4_clip_release(const struct net_device *dev, const u32 *lip, u8 v6);
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int clip_tbl_show(struct seq_file *seq, void *v);
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int cxgb4_update_root_dev_clip(struct net_device *dev);
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void t4_cleanup_clip_tbl(struct adapter *adap);
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