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git.karo-electronics.de Git - karo-tx-linux.git/commit
staging: vt6655: dpc.c: replace memcpy() by ether_addr_copy() using coccinelle
This patch focuses on fixing the following warning generated
by checkpatch.pl for the file dpc.c :
Prefer ether_addr_copy() over memcpy() if the Ethernet addresses
are __aligned(2)
The changes were applied using the following coccinelle rule:
@@ expression e1, e2; @@
- memcpy(e1, e2, ETH_ALEN);
+ ether_addr_copy(e1, e2);
According to ether_addr_copy() description and functionality,
all Ethernet addresses should align to the u16 datatype.
Here is the output of pahole for the relevant datastructures:
struct tagS802_11Header {
short unsigned int wFrameCtl; /* 0 2 */
short unsigned int wDurationID; /* 2 2 */
unsigned char abyAddr1[6]; /* 4 6 */
unsigned char abyAddr2[6]; /* 10 6 */
unsigned char abyAddr3[6]; /* 16 6 */
short unsigned int wSeqCtl; /* 22 2 */
unsigned char abyAddr4[6]; /* 24 6 */
/* size: 30, cachelines: 1, members: 7 */
/* last cacheline: 30 bytes */
};
struct iw_michaelmicfailure {
__u32 flags; /* 0 4 */
struct sockaddr src_addr; /* 4 16 */
__u8 tsc[8]; /* 20 8 */
/* size: 28, cachelines: 1, members: 3 */
/* last cacheline: 28 bytes */
};
struct sockaddr {
sa_family_t sa_family; /* 0 2 */
char sa_data[14]; /* 2 14 */
/* size: 16, cachelines: 1, members: 2 */
/* last cacheline: 16 bytes */
};
There is one thing to note though, sa_data is a char array of size 14.
And the number of bytes copied using memcpy() or ether_addr_copy()
is 6.
Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>