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EDAC: Use static attribute groups for managing sysfs entries

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Instead of manual calls of device_create_file() and
device_remove_file(), use static attribute groups with proper
is_visible callbacks for managing the sysfs entries.

This simplifies the code a lot and avoids the possible races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: http://lkml.kernel.org/r/1423046938-18111-2-git-send-email-tiwai@suse.de
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Takashi Iwai 2015-02-04 11:48:51 +01:00 committed by Borislav Petkov
parent 7260194595
commit 2c1946b6d6
1 changed files with 71 additions and 88 deletions
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159
drivers/edac/edac_mc_sysfs.c
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@ -323,13 +323,14 @@ DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
channel_dimm_label_show, channel_dimm_label_store, 5);
/* Total possible dynamic DIMM Label attribute file table */
static struct device_attribute *dynamic_csrow_dimm_attr[] = {
&dev_attr_legacy_ch0_dimm_label.attr,
&dev_attr_legacy_ch1_dimm_label.attr,
&dev_attr_legacy_ch2_dimm_label.attr,
&dev_attr_legacy_ch3_dimm_label.attr,
&dev_attr_legacy_ch4_dimm_label.attr,
&dev_attr_legacy_ch5_dimm_label.attr
static struct attribute *dynamic_csrow_dimm_attr[] = {
&dev_attr_legacy_ch0_dimm_label.attr.attr,
&dev_attr_legacy_ch1_dimm_label.attr.attr,
&dev_attr_legacy_ch2_dimm_label.attr.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,
NULL
};
/* possible dynamic channel ce_count attribute files */
@ -347,13 +348,45 @@ DEVICE_CHANNEL(ch5_ce_count, S_IRUGO,
channel_ce_count_show, NULL, 5);
/* Total possible dynamic ce_count attribute file table */
static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
&dev_attr_legacy_ch0_ce_count.attr,
&dev_attr_legacy_ch1_ce_count.attr,
&dev_attr_legacy_ch2_ce_count.attr,
&dev_attr_legacy_ch3_ce_count.attr,
&dev_attr_legacy_ch4_ce_count.attr,
&dev_attr_legacy_ch5_ce_count.attr
static struct attribute *dynamic_csrow_ce_count_attr[] = {
&dev_attr_legacy_ch0_ce_count.attr.attr,
&dev_attr_legacy_ch1_ce_count.attr.attr,
&dev_attr_legacy_ch2_ce_count.attr.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,
NULL
};
static umode_t csrow_dev_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
if (idx >= csrow->nr_channels)
return 0;
/* Only expose populated DIMMs */
if (!csrow->channels[idx]->dimm->nr_pages)
return 0;
return attr->mode;
}
static const struct attribute_group csrow_dev_dimm_group = {
.attrs = dynamic_csrow_dimm_attr,
.is_visible = csrow_dev_is_visible,
};
static const struct attribute_group csrow_dev_ce_count_group = {
.attrs = dynamic_csrow_ce_count_attr,
.is_visible = csrow_dev_is_visible,
};
static const struct attribute_group *csrow_dev_groups[] = {
&csrow_dev_dimm_group,
&csrow_dev_ce_count_group,
NULL
};
static inline int nr_pages_per_csrow(struct csrow_info *csrow)
@ -370,13 +403,12 @@ static inline int nr_pages_per_csrow(struct csrow_info *csrow)
static int edac_create_csrow_object(struct mem_ctl_info *mci,
struct csrow_info *csrow, int index)
{
int err, chan;
if (csrow->nr_channels > EDAC_NR_CHANNELS)
return -ENODEV;
csrow->dev.type = &csrow_attr_type;
csrow->dev.bus = mci->bus;
csrow->dev.groups = csrow_dev_groups;
device_initialize(&csrow->dev);
csrow->dev.parent = &mci->dev;
csrow->mci = mci;
@ -386,45 +418,13 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
edac_dbg(0, "creating (virtual) csrow node %s\n",
dev_name(&csrow->dev));
err = device_add(&csrow->dev);
if (err < 0)
return err;
for (chan = 0; chan < csrow->nr_channels; chan++) {
/* Only expose populated DIMMs */
if (!csrow->channels[chan]->dimm->nr_pages)
continue;
err = device_create_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
if (err < 0)
goto error;
err = device_create_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
if (err < 0) {
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
goto error;
}
}
return 0;
error:
for (--chan; chan >= 0; chan--) {
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
device_remove_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
}
put_device(&csrow->dev);
return err;
return device_add(&csrow->dev);
}
/* Create a CSROW object under specifed edac_mc_device */
static int edac_create_csrow_objects(struct mem_ctl_info *mci)
{
int err, i, chan;
int err, i;
struct csrow_info *csrow;
for (i = 0; i < mci->nr_csrows; i++) {
@ -446,14 +446,6 @@ error:
csrow = mci->csrows[i];
if (!nr_pages_per_csrow(csrow))
continue;
for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
if (!csrow->channels[chan]->dimm->nr_pages)
continue;
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
device_remove_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
}
put_device(&mci->csrows[i]->dev);
}
@ -462,23 +454,13 @@ error:
static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
{
int i, chan;
int i;
struct csrow_info *csrow;
for (i = mci->nr_csrows - 1; i >= 0; i--) {
csrow = mci->csrows[i];
if (!nr_pages_per_csrow(csrow))
continue;
for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
if (!csrow->channels[chan]->dimm->nr_pages)
continue;
edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
i, chan);
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
device_remove_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
}
device_unregister(&mci->csrows[i]->dev);
}
}
@ -863,7 +845,8 @@ static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
/* memory scrubber attribute file */
static DEVICE_ATTR(sdram_scrub_rate, 0, NULL, NULL);
DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show,
mci_sdram_scrub_rate_store); /* umode set later in is_visible */
static struct attribute *mci_attrs[] = {
&dev_attr_reset_counters.attr,
@ -875,11 +858,29 @@ static struct attribute *mci_attrs[] = {
&dev_attr_ue_count.attr,
&dev_attr_ce_count.attr,
&dev_attr_max_location.attr,
&dev_attr_sdram_scrub_rate.attr,
NULL
};
static umode_t mci_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct mem_ctl_info *mci = to_mci(dev);
umode_t mode = 0;
if (attr != &dev_attr_sdram_scrub_rate.attr)
return attr->mode;
if (mci->get_sdram_scrub_rate)
mode |= S_IRUGO;
if (mci->set_sdram_scrub_rate)
mode |= S_IWUSR;
return mode;
}
static struct attribute_group mci_attr_grp = {
.attrs = mci_attrs,
.is_visible = mci_attr_is_visible,
};
static const struct attribute_group *mci_attr_groups[] = {
@ -1008,23 +1009,6 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
goto fail_unregister_bus;
}
if (mci->set_sdram_scrub_rate || mci->get_sdram_scrub_rate) {
if (mci->get_sdram_scrub_rate) {
dev_attr_sdram_scrub_rate.attr.mode |= S_IRUGO;
dev_attr_sdram_scrub_rate.show = &mci_sdram_scrub_rate_show;
}
if (mci->set_sdram_scrub_rate) {
dev_attr_sdram_scrub_rate.attr.mode |= S_IWUSR;
dev_attr_sdram_scrub_rate.store = &mci_sdram_scrub_rate_store;
}
err = device_create_file(&mci->dev, &dev_attr_sdram_scrub_rate);
if (err) {
edac_dbg(1, "failure: create sdram_scrub_rate\n");
goto fail_unregister_dev;
}
}
/*
* Create the dimm/rank devices
*/
@ -1071,7 +1055,6 @@ fail_unregister_dimm:
device_unregister(&dimm->dev);
}
fail_unregister_dev:
device_unregister(&mci->dev);
fail_unregister_bus:
bus_unregister(mci->bus);