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authorGeorge Spelvin <linux@horizon.com>2014-05-10 10:32:57 -0400
committerJohn W. Linville <linville@tuxdriver.com>2014-05-16 14:26:52 -0400
commit1836eea209546b870dd83f3f4ef234d6598a560d (patch)
tree6d47ab85b4eb40d414ba74f2972b80096fd764b2 /include/linux/crc7.h
parentd91a48cbae4cc12f6e8a65372a73ecf46f8f1b7f (diff)
lib/crc7: Shift crc7() output left 1 bit
This eliminates a 1-bit left shift in every single caller, and makes the inner loop of the CRC computation more efficient. Renamed crc7 to crc7_be (big-endian) since the interface changed. Also purged #include <linux/crc7.h> from files that don't use it at all. Signed-off-by: George Spelvin <linux@horizon.com> Reviewed-by: Pavel Machek <pavel@ucw.cz> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'include/linux/crc7.h')
-rw-r--r--include/linux/crc7.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/crc7.h b/include/linux/crc7.h
index 1786e772d5c6..d590765106f3 100644
--- a/include/linux/crc7.h
+++ b/include/linux/crc7.h
@@ -2,13 +2,13 @@
2#define _LINUX_CRC7_H 2#define _LINUX_CRC7_H
3#include <linux/types.h> 3#include <linux/types.h>
4 4
5extern const u8 crc7_syndrome_table[256]; 5extern const u8 crc7_be_syndrome_table[256];
6 6
7static inline u8 crc7_byte(u8 crc, u8 data) 7static inline u8 crc7_be_byte(u8 crc, u8 data)
8{ 8{
9 return crc7_syndrome_table[(crc << 1) ^ data]; 9 return crc7_be_syndrome_table[crc ^ data];
10} 10}
11 11
12extern u8 crc7(u8 crc, const u8 *buffer, size_t len); 12extern u8 crc7_be(u8 crc, const u8 *buffer, size_t len);
13 13
14#endif 14#endif