After 'commit 7d375bffa524 ("sb_edac: Fix support for systems with two home agents per socket")', sysfs "dimm_label" and "chX_dimm_label" show their label string without a newline "\n" at the end.
[root@orange ~]# cat /sys/bus/mc0/devices/dimm0/dimm_label CPU_SrcID#0_Ha#0_Chan#0_DIMM#0[root@orange ~]# [root@orange ~]# cat /sys/devices/system/edac/mc/mc0/csrow0/ch0_dimm_label CPU_SrcID#0_Ha#0_Chan#0_DIMM#0[root@orange ~]# The label strings now have 31 characters, which are the same as EDAC_MC_LABEL_LEN. Since the snprintf()s in channel_dimm_label_show() and dimmdev_label_show() limit the whole length by EDAC_MC_LABEL_LEN, the newline in the format "%s\n" is ignored. [root@orange ~]# od -bc /sys/bus/mc0/devices/dimm0/dimm_label 0000000 103 120 125 137 123 162 143 111 104 043 060 137 110 141 043 060 C P U _ S r c I D # 0 _ H a # 0 0000020 137 103 150 141 156 043 060 137 104 111 115 115 043 060 000 _ C h a n # 0 _ D I M M # 0 \0 0000037 Fix it by using 'sizeof(dimm->label) + 1' as the whole length in the snprintf()s in channel_dimm_label_show() and dimmdev_label_show(). Reported-by: Robert Elliott <elli...@hpe.com> Signed-off-by: Toshi Kani <toshi.k...@hpe.com> Cc: Mauro Carvalho Chehab <mche...@osg.samsung.com> Cc: Borislav Petkov <b...@alien8.de> Cc: Doug Thompson <dougthomp...@xmission.com> Cc: Tony Luck <tony.l...@intel.com> Cc: Robert Elliott <elli...@hpe.com> --- drivers/edac/edac_mc_sysfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c index 33df7d9..8983755 100644 --- a/drivers/edac/edac_mc_sysfs.c +++ b/drivers/edac/edac_mc_sysfs.c @@ -229,7 +229,7 @@ static ssize_t channel_dimm_label_show(struct device *dev, if (!rank->dimm->label[0]) return 0; - return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", + return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n", rank->dimm->label); } @@ -485,7 +485,7 @@ static ssize_t dimmdev_label_show(struct device *dev, if (!dimm->label[0]) return 0; - return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label); + return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label); } static ssize_t dimmdev_label_store(struct device *dev, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/