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-rw-r--r--drivers/edac/edac_mc.c76
-rw-r--r--drivers/edac/edac_mc.h9
2 files changed, 42 insertions, 43 deletions
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index e6ecc7da38a5..7ee9419234aa 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -139,6 +139,12 @@ static struct sysdev_class edac_class = {
static struct kobject edac_memctrl_kobj;
static struct kobject edac_pci_kobj;
+/* We use these to wait for the reference counts on edac_memctrl_kobj and
+ * edac_pci_kobj to reach 0.
+ */
+static struct completion edac_memctrl_kobj_complete;
+static struct completion edac_pci_kobj_complete;
+
/*
* /sys/devices/system/edac/mc;
* data structures and methods
@@ -244,6 +250,7 @@ static struct memctrl_dev_attribute *memctrl_attr[] = {
static void edac_memctrl_master_release(struct kobject *kobj)
{
debugf1("%s()\n", __func__);
+ complete(&edac_memctrl_kobj_complete);
}
static struct kobj_type ktype_memctrl = {
@@ -309,8 +316,12 @@ static void edac_sysfs_memctrl_teardown(void)
#ifndef DISABLE_EDAC_SYSFS
debugf0("MC: " __FILE__ ": %s()\n", __func__);
- /* Unregister the MC's kobject */
+ /* Unregister the MC's kobject and wait for reference count to reach
+ * 0.
+ */
+ init_completion(&edac_memctrl_kobj_complete);
kobject_unregister(&edac_memctrl_kobj);
+ wait_for_completion(&edac_memctrl_kobj_complete);
/* Unregister the 'edac' object */
sysdev_class_unregister(&edac_class);
@@ -563,6 +574,7 @@ static struct edac_pci_dev_attribute *edac_pci_attr[] = {
static void edac_pci_release(struct kobject *kobj)
{
debugf1("%s()\n", __func__);
+ complete(&edac_pci_kobj_complete);
}
static struct kobj_type ktype_edac_pci = {
@@ -610,8 +622,9 @@ static void edac_sysfs_pci_teardown(void)
{
#ifndef DISABLE_EDAC_SYSFS
debugf0("%s()\n", __func__);
-
+ init_completion(&edac_pci_kobj_complete);
kobject_unregister(&edac_pci_kobj);
+ wait_for_completion(&edac_pci_kobj_complete);
#endif
}
@@ -800,7 +813,11 @@ static struct csrowdev_attribute *csrow_attr[] = {
/* No memory to release */
static void edac_csrow_instance_release(struct kobject *kobj)
{
+ struct csrow_info *cs;
+
debugf1("%s()\n", __func__);
+ cs = container_of(kobj, struct csrow_info, kobj);
+ complete(&cs->kobj_complete);
}
static struct kobj_type ktype_csrow = {
@@ -1055,11 +1072,10 @@ static struct mcidev_attribute *mci_attr[] = {
static void edac_mci_instance_release(struct kobject *kobj)
{
struct mem_ctl_info *mci;
- mci = container_of(kobj,struct mem_ctl_info,edac_mci_kobj);
- debugf0("%s() idx=%d calling kfree\n", __func__, mci->mc_idx);
-
- kfree(mci);
+ mci = to_mci(kobj);
+ debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
+ complete(&mci->kobj_complete);
}
static struct kobj_type ktype_mci = {
@@ -1131,21 +1147,23 @@ static int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
}
}
- /* Mark this MCI instance as having sysfs entries */
- mci->sysfs_active = MCI_SYSFS_ACTIVE;
-
return 0;
/* CSROW error: backout what has already been registered, */
fail1:
for ( i--; i >= 0; i--) {
- if (csrow->nr_pages > 0)
+ if (csrow->nr_pages > 0) {
+ init_completion(&csrow->kobj_complete);
kobject_unregister(&mci->csrows[i].kobj);
+ wait_for_completion(&csrow->kobj_complete);
+ }
}
fail0:
+ init_completion(&mci->kobj_complete);
kobject_unregister(edac_mci_kobj);
+ wait_for_completion(&mci->kobj_complete);
return err;
}
@@ -1163,13 +1181,17 @@ static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
/* remove all csrow kobjects */
for (i = 0; i < mci->nr_csrows; i++) {
- if (mci->csrows[i].nr_pages > 0)
+ if (mci->csrows[i].nr_pages > 0) {
+ init_completion(&mci->csrows[i].kobj_complete);
kobject_unregister(&mci->csrows[i].kobj);
+ wait_for_completion(&mci->csrows[i].kobj_complete);
+ }
}
sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
-
+ init_completion(&mci->kobj_complete);
kobject_unregister(&mci->edac_mci_kobj);
+ wait_for_completion(&mci->kobj_complete);
#endif /* DISABLE_EDAC_SYSFS */
}
@@ -1342,31 +1364,10 @@ EXPORT_SYMBOL(edac_mc_free);
/**
* edac_mc_free: Free a previously allocated 'mci' structure
* @mci: pointer to a struct mem_ctl_info structure
- *
- * Free up a previously allocated mci structure
- * A MCI structure can be in 2 states after being allocated
- * by edac_mc_alloc().
- * 1) Allocated in a MC driver's probe, but not yet committed
- * 2) Allocated and committed, by a call to edac_mc_add_mc()
- * edac_mc_add_mc() is the function that adds the sysfs entries
- * thus, this free function must determine which state the 'mci'
- * structure is in, then either free it directly or
- * perform kobject cleanup by calling edac_remove_sysfs_mci_device().
- *
- * VOID Return
*/
void edac_mc_free(struct mem_ctl_info *mci)
{
- /* only if sysfs entries for this mci instance exist
- * do we remove them and defer the actual kfree via
- * the kobject 'release()' callback.
- *
- * Otherwise, do a straight kfree now.
- */
- if (mci->sysfs_active == MCI_SYSFS_ACTIVE)
- edac_remove_sysfs_mci_device(mci);
- else
- kfree(mci);
+ kfree(mci);
}
@@ -1456,7 +1457,8 @@ static void del_mc_from_global_list (struct mem_ctl_info *mci)
EXPORT_SYMBOL(edac_mc_add_mc);
/**
- * edac_mc_add_mc: Insert the 'mci' structure into the mci global list
+ * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and
+ * create sysfs entries associated with mci structure
* @mci: pointer to the mci structure to be added to the list
*
* Return:
@@ -1516,7 +1518,8 @@ fail0:
EXPORT_SYMBOL(edac_mc_del_mc);
/**
- * edac_mc_del_mc: Remove the specified mci structure from global list
+ * edac_mc_del_mc: Remove sysfs entries for specified mci structure and
+ * remove mci structure from global list
* @mci: Pointer to struct mem_ctl_info structure
*
* Returns:
@@ -1528,6 +1531,7 @@ int edac_mc_del_mc(struct mem_ctl_info *mci)
int rc = 1;
debugf0("MC%d: %s()\n", mci->mc_idx, __func__);
+ edac_remove_sysfs_mci_device(mci);
down(&mem_ctls_mutex);
del_mc_from_global_list(mci);
edac_printk(KERN_INFO, EDAC_MC,
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index 0bcc3797c753..c9c1590db721 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -185,11 +185,6 @@ enum scrub_type {
#define SCRUB_FLAG_HW_PROG_SRC BIT(SCRUB_HW_PROG_SRC_CORR)
#define SCRUB_FLAG_HW_TUN BIT(SCRUB_HW_TUNABLE)
-enum mci_sysfs_status {
- MCI_SYSFS_INACTIVE = 0, /* sysfs entries NOT registered */
- MCI_SYSFS_ACTIVE /* sysfs entries ARE registered */
-};
-
/* FIXME - should have notify capabilities: NMI, LOG, PROC, etc */
/*
@@ -299,6 +294,7 @@ struct csrow_info {
struct mem_ctl_info *mci; /* the parent */
struct kobject kobj; /* sysfs kobject for this csrow */
+ struct completion kobj_complete;
/* FIXME the number of CHANNELs might need to become dynamic */
u32 nr_channels;
@@ -320,8 +316,6 @@ struct mem_ctl_info {
unsigned long scrub_cap; /* chipset scrub capabilities */
enum scrub_type scrub_mode; /* current scrub mode */
- enum mci_sysfs_status sysfs_active; /* status of sysfs */
-
/* pointer to edac checking routine */
void (*edac_check) (struct mem_ctl_info * mci);
/*
@@ -359,6 +353,7 @@ struct mem_ctl_info {
/* edac sysfs device control */
struct kobject edac_mci_kobj;
+ struct completion kobj_complete;
};