EDAC: Drop per-memory controller buses

... and use the single edac_subsys object returned from
subsys_system_register(). The idea is to have a single bus
and multiple devices on it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
CC: Aristeu Rozanski Filho <arozansk@redhat.com>
CC: Greg KH <gregkh@linuxfoundation.org>
CC: Justin Ernst <justin.ernst@hpe.com>
CC: linux-edac <linux-edac@vger.kernel.org>
CC: Mauro Carvalho Chehab <mchehab@kernel.org>
CC: Russ Anderson <rja@hpe.com>
Cc: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20180926152752.GG5584@zn.tnic

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 7d3edd7..13594ff 100644 (file)
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -55,8 +55,6 @@ static LIST_HEAD(mc_devices);
  */
 static const char *edac_mc_owner;
 
-static struct bus_type mc_bus[EDAC_MAX_MCS];
-
 int edac_get_report_status(void)
 {
        return edac_report;
@@ -716,11 +714,6 @@ int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
        int ret = -EINVAL;
        edac_dbg(0, "\n");
 
-       if (mci->mc_idx >= EDAC_MAX_MCS) {
-               pr_warn_once("Too many memory controllers: %d\n", mci->mc_idx);
-               return -ENODEV;
-       }
-
 #ifdef CONFIG_EDAC_DEBUG
        if (edac_debug_level >= 3)
                edac_mc_dump_mci(mci);
@@ -760,7 +753,7 @@ int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
        /* set load time so that error rate can be tracked */
        mci->start_time = jiffies;
 
-       mci->bus = &mc_bus[mci->mc_idx];
+       mci->bus = edac_get_sysfs_subsys();
 
        if (edac_create_sysfs_mci_device(mci, groups)) {
                edac_mc_printk(mci, KERN_WARNING,

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 4c1bee5..4641746 100644 (file)
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -912,27 +912,8 @@ static const struct device_type mci_attr_type = {
 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
                                 const struct attribute_group **groups)
 {
-       char *name;
        int i, err;
 
-       /*
-        * The memory controller needs its own bus, in order to avoid
-        * namespace conflicts at /sys/bus/edac.
-        */
-       name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
-       if (!name)
-               return -ENOMEM;
-
-       mci->bus->name = name;
-
-       edac_dbg(0, "creating bus %s\n", mci->bus->name);
-
-       err = bus_register(mci->bus);
-       if (err < 0) {
-               kfree(name);
-               return err;
-       }
-
        /* get the /sys/devices/system/edac subsys reference */
        mci->dev.type = &mci_attr_type;
        device_initialize(&mci->dev);
@@ -947,7 +928,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci,
        err = device_add(&mci->dev);
        if (err < 0) {
                edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
-               goto fail_unregister_bus;
+               goto out;
        }
 
        /*
@@ -995,10 +976,8 @@ fail_unregister_dimm:
                device_unregister(&dimm->dev);
        }
        device_unregister(&mci->dev);
-fail_unregister_bus:
-       bus_unregister(mci->bus);
-       kfree(name);
 
+out:
        return err;
 }
 
@@ -1029,13 +1008,8 @@ void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 
 void edac_unregister_sysfs(struct mem_ctl_info *mci)
 {
-       struct bus_type *bus = mci->bus;
-       const char *name = mci->bus->name;
-
        edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
        device_unregister(&mci->dev);
-       bus_unregister(bus);
-       kfree(name);
 }
 
 static void mc_attr_release(struct device *dev)

diff --git a/include/linux/edac.h b/include/linux/edac.h
index 1d0c9ea..342dabd 100644 (file)
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -669,10 +669,4 @@ struct mem_ctl_info {
        bool fake_inject_ue;
        u16 fake_inject_count;
 };
-
-/*
- * Maximum number of memory controllers in the coherent fabric.
- */
-#define EDAC_MAX_MCS   2 * MAX_NUMNODES
-
 #endif