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EDAC: Correct channel count limit

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c44696fff0 ("EDAC: Remove arbitrary limit on number of channels")
lifted the arbitrary limit on memory controller channels in EDAC.
However, the dynamic channel attributes dynamic_csrow_dimm_attr and
dynamic_csrow_ce_count_attr remained 6.

This wasn't a problem except channels 6 and 7 weren't visible in sysfs
on machines with more than 6 channels after the conversion to static
attr groups with

  2c1946b6d6 ("EDAC: Use static attribute groups for managing sysfs entries")

 [ without that, we're exploding in edac_create_sysfs_mci_device()
   because we're dereferencing out of the bounds of the
   dynamic_csrow_dimm_attr array. ]

Add attributes for channels 6 and 7 along with a guard for the
future, should more channels be required and/or to sanity check for
misconfigured machines.

We still need to check against the number of channels present on the MC
first, as Thor reported.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reported-by: Hironobu Ishii <ishii.hironobu@jp.fujitsu.com>
Tested-by: Thor Thayer <tthayer@opensource.altera.com>
Cc: <stable@vger.kernel.org> # 4.2
This commit is contained in:
Borislav Petkov 2016-06-10 10:28:38 +02:00
parent 6ba92fea1b
commit bba142957e
1 changed files with 19 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/edac/edac_mc_sysfs.c
View File

@ -313,7 +313,6 @@ static struct device_type csrow_attr_type = {
* possible dynamic channel DIMM Label attribute files
*
*/
DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
channel_dimm_label_show, channel_dimm_label_store, 0);
DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
@ -326,6 +325,10 @@ DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
channel_dimm_label_show, channel_dimm_label_store, 4);
DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
channel_dimm_label_show, channel_dimm_label_store, 5);
DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR,
channel_dimm_label_show, channel_dimm_label_store, 6);
DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR,
channel_dimm_label_show, channel_dimm_label_store, 7);
/* Total possible dynamic DIMM Label attribute file table */
static struct attribute *dynamic_csrow_dimm_attr[] = {
@ -335,6 +338,8 @@ static struct attribute *dynamic_csrow_dimm_attr[] = {
&dev_attr_legacy_ch3_dimm_label.attr.attr,
&dev_attr_legacy_ch4_dimm_label.attr.attr,
&dev_attr_legacy_ch5_dimm_label.attr.attr,
&dev_attr_legacy_ch6_dimm_label.attr.attr,
&dev_attr_legacy_ch7_dimm_label.attr.attr,
NULL
};
@ -351,6 +356,10 @@ DEVICE_CHANNEL(ch4_ce_count, S_IRUGO,
channel_ce_count_show, NULL, 4);
DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
channel_ce_count_show, NULL, 5);
DEVICE_CHANNEL(ch6_ce_count, S_IRUGO,
channel_ce_count_show, NULL, 6);
DEVICE_CHANNEL(ch7_ce_count, S_IRUGO,
channel_ce_count_show, NULL, 7);
/* Total possible dynamic ce_count attribute file table */
static struct attribute *dynamic_csrow_ce_count_attr[] = {
@ -360,6 +369,8 @@ static struct attribute *dynamic_csrow_ce_count_attr[] = {
&dev_attr_legacy_ch3_ce_count.attr.attr,
&dev_attr_legacy_ch4_ce_count.attr.attr,
&dev_attr_legacy_ch5_ce_count.attr.attr,
&dev_attr_legacy_ch6_ce_count.attr.attr,
&dev_attr_legacy_ch7_ce_count.attr.attr,
NULL
};
@ -371,9 +382,16 @@ static umode_t csrow_dev_is_visible(struct kobject *kobj,
if (idx >= csrow->nr_channels)
return 0;
if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) {
WARN_ONCE(1, "idx: %d\n", idx);
return 0;
}
/* Only expose populated DIMMs */
if (!csrow->channels[idx]->dimm->nr_pages)
return 0;
return attr->mode;
}