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Message-Id: <1423046938-18111-2-git-send-email-tiwai@suse.de>
Date: Wed, 4 Feb 2015 11:48:51 +0100
From: Takashi Iwai <tiwai@...e.de>
To: linux-edac@...r.kernel.org
Cc: Doug Thompson <dougthompson@...ssion.com>,
Borislav Petkov <bp@...en8.de>,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/8] EDAC: core: Use static attribute groups for managing sysfs entries
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@...e.de>
---
drivers/edac/edac_mc_sysfs.c | 158 +++++++++++++++++++------------------------
1 file changed, 71 insertions(+), 87 deletions(-)
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 670d2829c547..2ab3ea0349fb 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -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 @@ DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
/* memory scrubber attribute file */
-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[] = {
@@ -1010,22 +1011,6 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
return err;
}
- 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 fail2;
- }
- }
/*
* Create the dimm/rank devices
*/
@@ -1070,7 +1055,6 @@ fail:
continue;
device_unregister(&dimm->dev);
}
-fail2:
device_unregister(&mci->dev);
bus_unregister(mci->bus);
kfree(mci->bus->name);
--
2.2.2
--
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