diff options
| author | Min Li <min.li.xe@renesas.com> | 2020-11-24 21:58:35 -0500 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-25 17:24:49 -0800 |
| commit | 3cb2e6d92be637b79d6ba0746d610a8dfcc0400b (patch) | |
| tree | 83bc29b5ac7183aab28c2423a5dbf925d34e008d /drivers/ptp | |
| parent | 90cf87d16bd566cff40c2bc8e32e6d4cd3af23f0 (diff) | |
ptp: clockmatrix: bug fix for idtcm_strverscmp
Feed kstrtou8 with NULL terminated string.
Changes since v1:
-Use sscanf to get rid of adhoc string parse.
Changes since v2:
-Check if sscanf returns 3.
Fixes: 7ea5fda2b132 ("ptp: ptp_clockmatrix: update to support 4.8.7 firmware")
Signed-off-by: Min Li <min.li.xe@renesas.com>
Link: https://lore.kernel.org/r/1606273115-25792-1-git-send-email-min.li.xe@renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/ptp')
| -rw-r--r-- | drivers/ptp/ptp_clockmatrix.c | 49 |
1 files changed, 16 insertions, 33 deletions
diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c index e020faff7da5..663255774c0b 100644 --- a/drivers/ptp/ptp_clockmatrix.c +++ b/drivers/ptp/ptp_clockmatrix.c @@ -103,43 +103,26 @@ static int timespec_to_char_array(struct timespec64 const *ts, return 0; } -static int idtcm_strverscmp(const char *ver1, const char *ver2) +static int idtcm_strverscmp(const char *version1, const char *version2) { - u8 num1; - u8 num2; - int result = 0; - - /* loop through each level of the version string */ - while (result == 0) { - /* extract leading version numbers */ - if (kstrtou8(ver1, 10, &num1) < 0) - return -1; + u8 ver1[3], ver2[3]; + int i; - if (kstrtou8(ver2, 10, &num2) < 0) - return -1; + if (sscanf(version1, "%hhu.%hhu.%hhu", + &ver1[0], &ver1[1], &ver1[2]) != 3) + return -1; + if (sscanf(version2, "%hhu.%hhu.%hhu", + &ver2[0], &ver2[1], &ver2[2]) != 3) + return -1; - /* if numbers differ, then set the result */ - if (num1 < num2) - result = -1; - else if (num1 > num2) - result = 1; - else { - /* if numbers are the same, go to next level */ - ver1 = strchr(ver1, '.'); - ver2 = strchr(ver2, '.'); - if (!ver1 && !ver2) - break; - else if (!ver1) - result = -1; - else if (!ver2) - result = 1; - else { - ver1++; - ver2++; - } - } + for (i = 0; i < 3; i++) { + if (ver1[i] > ver2[i]) + return 1; + if (ver1[i] < ver2[i]) + return -1; } - return result; + + return 0; } static int idtcm_xfer_read(struct idtcm *idtcm, |