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EDAC: Fix sysfs dimm_label show operation

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After

  7d375bffa5 ("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 <[email protected]>
Signed-off-by: Toshi Kani <[email protected]>
Acked-by: Tony Luck <[email protected]>
Cc: linux-edac <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Borislav Petkov <[email protected]>
This commit is contained in:
Toshi Kani 2015-09-22 08:58:02 -06:00 • committed by Borislav Petkov
commit 1ea62c59c8
1 changed files with 2 additions and 2 deletions
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4
drivers/edac/edac_mc_sysfs.c
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@ -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,