EDAC: Fix lockdep splat

Fix the following:

BUG: key ffff88043bdd0330 not in .data!
------------[ cut here ]------------
WARNING: at kernel/lockdep.c:2987 lockdep_init_map+0x565/0x5a0()
DEBUG_LOCKS_WARN_ON(1)
Modules linked in: glue_helper sb_edac(+) edac_core snd acpi_cpufreq lrw gf128mul ablk_helper iTCO_wdt evdev i2c_i801 dcdbas button cryptd pcspkr iTCO_vendor_support usb_common lpc_ich mfd_core soundcore mperf processor microcode
CPU: 2 PID: 599 Comm: modprobe Not tainted 3.10.0 #1
Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
 0000000000000009 ffff880439a1d920 ffffffff8160a9a9 ffff880439a1d958
 ffffffff8103d9e0 ffff88043af4a510 ffffffff81a16e11 0000000000000000
 ffff88043bdd0330 0000000000000000 ffff880439a1d9b8 ffffffff8103dacc
Call Trace:
  dump_stack
  warn_slowpath_common
  warn_slowpath_fmt
  lockdep_init_map
  ? trace_hardirqs_on_caller
  ? trace_hardirqs_on
  debug_mutex_init
  __mutex_init
  bus_register
  edac_create_sysfs_mci_device
  edac_mc_add_mc
  sbridge_probe
  pci_device_probe
  driver_probe_device
  __driver_attach
  ? driver_probe_device
  bus_for_each_dev
  driver_attach
  bus_add_driver
  driver_register
  __pci_register_driver
  ? 0xffffffffa0010fff
  sbridge_init
  ? 0xffffffffa0010fff
  do_one_initcall
  load_module
  ? unset_module_init_ro_nx
  SyS_init_module
  tracesys
---[ end trace d24a70b0d3ddf733 ]---
EDAC MC0: Giving out device to 'sbridge_edac.c' 'Sandy Bridge Socket#0': DEV 0000:3f:0e.0
EDAC sbridge: Driver loaded.

What happens is that bus_register needs a statically allocated lock_key
because the last is handed in to lockdep. However, struct mem_ctl_info
embeds struct bus_type (the whole struct, not a pointer to it) and the
whole thing gets dynamically allocated.

Fix this by using a statically allocated struct bus_type for the MC bus.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: stable@kernel.org # v3.10
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Borislav Petkov 2013-07-19 12:28:25 +02:00 committed by Tony Luck
parent ad81f0545e
commit 88d84ac973
4 changed files with 31 additions and 15 deletions

View file

@ -48,6 +48,8 @@ static LIST_HEAD(mc_devices);
*/
static void const *edac_mc_owner;
static struct bus_type mc_bus[EDAC_MAX_MCS];
unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
unsigned len)
{
@ -723,6 +725,11 @@ int edac_mc_add_mc(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);
@ -762,6 +769,8 @@ int edac_mc_add_mc(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];
if (edac_create_sysfs_mci_device(mci)) {
edac_mc_printk(mci, KERN_WARNING,
"failed to create sysfs device\n");

View file

@ -370,7 +370,7 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
return -ENODEV;
csrow->dev.type = &csrow_attr_type;
csrow->dev.bus = &mci->bus;
csrow->dev.bus = mci->bus;
device_initialize(&csrow->dev);
csrow->dev.parent = &mci->dev;
csrow->mci = mci;
@ -605,7 +605,7 @@ static int edac_create_dimm_object(struct mem_ctl_info *mci,
dimm->mci = mci;
dimm->dev.type = &dimm_attr_type;
dimm->dev.bus = &mci->bus;
dimm->dev.bus = mci->bus;
device_initialize(&dimm->dev);
dimm->dev.parent = &mci->dev;
@ -975,11 +975,13 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
* The memory controller needs its own bus, in order to avoid
* namespace conflicts at /sys/bus/edac.
*/
mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
if (!mci->bus.name)
mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
if (!mci->bus->name)
return -ENOMEM;
edac_dbg(0, "creating bus %s\n", mci->bus.name);
err = bus_register(&mci->bus);
edac_dbg(0, "creating bus %s\n", mci->bus->name);
err = bus_register(mci->bus);
if (err < 0)
return err;
@ -988,7 +990,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
device_initialize(&mci->dev);
mci->dev.parent = mci_pdev;
mci->dev.bus = &mci->bus;
mci->dev.bus = mci->bus;
dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
dev_set_drvdata(&mci->dev, mci);
pm_runtime_forbid(&mci->dev);
@ -997,8 +999,8 @@ 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));
bus_unregister(&mci->bus);
kfree(mci->bus.name);
bus_unregister(mci->bus);
kfree(mci->bus->name);
return err;
}
@ -1064,8 +1066,8 @@ fail:
}
fail2:
device_unregister(&mci->dev);
bus_unregister(&mci->bus);
kfree(mci->bus.name);
bus_unregister(mci->bus);
kfree(mci->bus->name);
return err;
}
@ -1098,8 +1100,8 @@ void edac_unregister_sysfs(struct mem_ctl_info *mci)
{
edac_dbg(1, "Unregistering device %s\n", dev_name(&mci->dev));
device_unregister(&mci->dev);
bus_unregister(&mci->bus);
kfree(mci->bus.name);
bus_unregister(mci->bus);
kfree(mci->bus->name);
}
static void mc_attr_release(struct device *dev)

View file

@ -974,7 +974,7 @@ static int i5100_setup_debugfs(struct mem_ctl_info *mci)
if (!i5100_debugfs)
return -ENODEV;
priv->debugfs = debugfs_create_dir(mci->bus.name, i5100_debugfs);
priv->debugfs = debugfs_create_dir(mci->bus->name, i5100_debugfs);
if (!priv->debugfs)
return -ENOMEM;

View file

@ -622,7 +622,7 @@ struct edac_raw_error_desc {
*/
struct mem_ctl_info {
struct device dev;
struct bus_type bus;
struct bus_type *bus;
struct list_head link; /* for global list of mem_ctl_info structs */
@ -742,4 +742,9 @@ struct mem_ctl_info {
#endif
};
/*
* Maximum number of memory controllers in the coherent fabric.
*/
#define EDAC_MAX_MCS 16
#endif