cregit-Linux how code gets into the kernel

Release 4.11 drivers/edac/edac_mc.c

Directory: drivers/edac
/*
 * edac_mc kernel module
 * (C) 2005, 2006 Linux Networx (http://lnxi.com)
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written by Thayne Harbaugh
 * Based on work by Dan Hollis <goemon at anime dot net> and others.
 *      http://www.anime.net/~goemon/linux-ecc/
 *
 * Modified by Dave Peterson and Doug Thompson
 *
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/highmem.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/edac.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <asm/page.h>
#include "edac_mc.h"
#include "edac_module.h"
#include <ras/ras_event.h>

#ifdef CONFIG_EDAC_ATOMIC_SCRUB
#include <asm/edac.h>
#else

#define edac_atomic_scrub(va, size) do { } while (0)
#endif

/* lock to memory controller's control array */
static DEFINE_MUTEX(mem_ctls_mutex);
static LIST_HEAD(mc_devices);

/*
 * Used to lock EDAC MC to just one module, avoiding two drivers e. g.
 *      apei/ghes and i7core_edac to be used at the same time.
 */

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)
{
	struct mem_ctl_info *mci = dimm->mci;
	int i, n, count = 0;
	char *p = buf;

	for (i = 0; i < mci->n_layers; i++) {
		n = snprintf(p, len, "%s %d ",
			      edac_layer_name[mci->layers[i].type],
			      dimm->location[i]);
		p += n;
		len -= n;
		count += n;
		if (!len)
			break;
	}

	return count;
}


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Total109100.00%1100.00%



#ifdef CONFIG_EDAC_DEBUG




static void edac_mc_dump_channel(struct rank_info *chan)
{
	edac_dbg(4, "  channel->chan_idx = %d\n", chan->chan_idx);
	edac_dbg(4, "    channel = %p\n", chan);
	edac_dbg(4, "    channel->csrow = %p\n", chan->csrow);
	edac_dbg(4, "    channel->dimm = %p\n", chan->dimm);
}


Contributors
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Doug Thompson2139.62%222.22%


Mauro Carvalho Chehab1833.96%555.56%


Joe Perches1222.64%111.11%


Alan Cox23.77%111.11%


Total53100.00%9100.00%






static void edac_mc_dump_dimm(struct dimm_info *dimm, int number)
{
	char location[80];

	edac_dimm_info_location(dimm, location, sizeof(location));

	edac_dbg(4, "%s%i: %smapped as virtual row %d, chan %d\n",
		 dimm->mci->csbased ? "rank" : "dimm",
		 number, location, dimm->csrow, dimm->cschannel);
	edac_dbg(4, "  dimm = %p\n", dimm);
	edac_dbg(4, "  dimm->label = '%s'\n", dimm->label);
	edac_dbg(4, "  dimm->nr_pages = 0x%x\n", dimm->nr_pages);
	edac_dbg(4, "  dimm->grain = %d\n", dimm->grain);
	edac_dbg(4, "  dimm->nr_pages = 0x%x\n", dimm->nr_pages);
}


Contributors
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Mauro Carvalho Chehab8877.19%562.50%


Joe Perches1614.04%112.50%


Doug Thompson97.89%112.50%


Alan Cox10.88%112.50%


Total114100.00%8100.00%






static void edac_mc_dump_csrow(struct csrow_info *csrow)
{
	edac_dbg(4, "csrow->csrow_idx = %d\n", csrow->csrow_idx);
	edac_dbg(4, "  csrow = %p\n", csrow);
	edac_dbg(4, "  csrow->first_page = 0x%lx\n", csrow->first_page);
	edac_dbg(4, "  csrow->last_page = 0x%lx\n", csrow->last_page);
	edac_dbg(4, "  csrow->page_mask = 0x%lx\n", csrow->page_mask);
	edac_dbg(4, "  csrow->nr_channels = %d\n", csrow->nr_channels);
	edac_dbg(4, "  csrow->channels = %p\n", csrow->channels);
	edac_dbg(4, "  csrow->mci = %p\n", csrow->mci);
}


Contributors
PersonTokensPropCommitsCommitProp
Doug Thompson3435.05%233.33%


Dave Peterson2727.84%116.67%


Joe Perches2424.74%116.67%


Mauro Carvalho Chehab1010.31%116.67%


Alan Cox22.06%116.67%


Total97100.00%6100.00%






static void edac_mc_dump_mci(struct mem_ctl_info *mci)
{
	edac_dbg(3, "\tmci = %p\n", mci);
	edac_dbg(3, "\tmci->mtype_cap = %lx\n", mci->mtype_cap);
	edac_dbg(3, "\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
	edac_dbg(3, "\tmci->edac_cap = %lx\n", mci->edac_cap);
	edac_dbg(4, "\tmci->edac_check = %p\n", mci->edac_check);
	edac_dbg(3, "\tmci->nr_csrows = %d, csrows = %p\n",
		 mci->nr_csrows, mci->csrows);
	edac_dbg(3, "\tmci->nr_dimms = %d, dimms = %p\n",
		 mci->tot_dimms, mci->dimms);
	edac_dbg(3, "\tdev = %p\n", mci->pdev);
	edac_dbg(3, "\tmod_name:ctl_name = %s:%s\n",
		 mci->mod_name, mci->ctl_name);
	edac_dbg(3, "\tpvt_info = %p\n\n", mci->pvt_info);
}


Contributors
PersonTokensPropCommitsCommitProp
Alan Cox4332.82%114.29%


Doug Thompson3829.01%114.29%


Joe Perches3022.90%114.29%


Mauro Carvalho Chehab139.92%228.57%


Dave Peterson64.58%114.29%


Adrian Bunk10.76%114.29%


Total131100.00%7100.00%



#endif				/* CONFIG_EDAC_DEBUG */


const char * const edac_mem_types[] = {
	[MEM_EMPTY]	= "Empty csrow",
	[MEM_RESERVED]	= "Reserved csrow type",
	[MEM_UNKNOWN]	= "Unknown csrow type",
	[MEM_FPM]	= "Fast page mode RAM",
	[MEM_EDO]	= "Extended data out RAM",
	[MEM_BEDO]	= "Burst Extended data out RAM",
	[MEM_SDR]	= "Single data rate SDRAM",
	[MEM_RDR]	= "Registered single data rate SDRAM",
	[MEM_DDR]	= "Double data rate SDRAM",
	[MEM_RDDR]	= "Registered Double data rate SDRAM",
	[MEM_RMBS]	= "Rambus DRAM",
	[MEM_DDR2]	= "Unbuffered DDR2 RAM",
	[MEM_FB_DDR2]	= "Fully buffered DDR2",
	[MEM_RDDR2]	= "Registered DDR2 RAM",
	[MEM_XDR]	= "Rambus XDR",
	[MEM_DDR3]	= "Unbuffered DDR3 RAM",
	[MEM_RDDR3]	= "Registered DDR3 RAM",
	[MEM_LRDDR3]	= "Load-Reduced DDR3 RAM",
	[MEM_DDR4]	= "Unbuffered DDR4 RAM",
	[MEM_RDDR4]	= "Registered DDR4 RAM",
};

EXPORT_SYMBOL_GPL(edac_mem_types);

/**
 * edac_align_ptr - Prepares the pointer offsets for a single-shot allocation
 * @p:          pointer to a pointer with the memory offset to be used. At
 *              return, this will be incremented to point to the next offset
 * @size:       Size of the data structure to be reserved
 * @n_elems:    Number of elements that should be reserved
 *
 * If 'size' is a constant, the compiler will optimize this whole function
 * down to either a no-op or the addition of a constant to the value of '*p'.
 *
 * The 'p' pointer is absolutely needed to keep the proper advancing
 * further in memory to the proper offsets when allocating the struct along
 * with its embedded structs, as edac_device_alloc_ctl_info() does it
 * above, for example.
 *
 * At return, the pointer 'p' will be incremented to be used on a next call
 * to this function.
 */



void *edac_align_ptr(void **p, unsigned size, int n_elems)
{
	unsigned align, r;
	void *ptr = *p;

	*p += size * n_elems;

	/*
         * 'p' can possibly be an unaligned item X such that sizeof(X) is
         * 'size'.  Adjust 'p' so that its alignment is at least as
         * stringent as what the compiler would provide for X and return
         * the aligned result.
         * Here we assume that the alignment of a "long long" is the most
         * stringent alignment that the compiler will ever provide by default.
         * As far as I know, this is a reasonable assumption.
         */
	if (size > sizeof(long))
		align = sizeof(long long);
	else if (size > sizeof(int))
		align = sizeof(long);
	else if (size > sizeof(short))
		align = sizeof(int);
	else if (size > sizeof(char))
		align = sizeof(short);
	else
		return (char *)ptr;

	r = (unsigned long)p % align;

	if (r == 0)
		return (char *)ptr;

	*p += align - r;

	return (void *)(((unsigned long)ptr) + align - r);
}


Contributors
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Doug Thompson10061.73%337.50%


Mauro Carvalho Chehab2716.67%112.50%


Alan Cox1710.49%112.50%


Dave Peterson138.02%225.00%


Chris Metcalf53.09%112.50%


Total162100.00%8100.00%






static void _edac_mc_free(struct mem_ctl_info *mci)
{
	int i, chn, row;
	struct csrow_info *csr;
	const unsigned int tot_dimms = mci->tot_dimms;
	const unsigned int tot_channels = mci->num_cschannel;
	const unsigned int tot_csrows = mci->nr_csrows;

	if (mci->dimms) {
		for (i = 0; i < tot_dimms; i++)
			kfree(mci->dimms[i]);
		kfree(mci->dimms);
	}
	if (mci->csrows) {
		for (row = 0; row < tot_csrows; row++) {
			csr = mci->csrows[row];
			if (csr) {
				if (csr->channels) {
					for (chn = 0; chn < tot_channels; chn++)
						kfree(csr->channels[chn]);
					kfree(csr->channels);
				}
				kfree(csr);
			}
		}
		kfree(mci->csrows);
	}
	kfree(mci);
}


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Total181100.00%1100.00%






struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
				   unsigned n_layers,
				   struct edac_mc_layer *layers,
				   unsigned sz_pvt)
{
	struct mem_ctl_info *mci;
	struct edac_mc_layer *layer;
	struct csrow_info *csr;
	struct rank_info *chan;
	struct dimm_info *dimm;
	u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
	unsigned pos[EDAC_MAX_LAYERS];
	unsigned size, tot_dimms = 1, count = 1;
	unsigned tot_csrows = 1, tot_channels = 1, tot_errcount = 0;
	void *pvt, *p, *ptr = NULL;
	int i, j, row, chn, n, len, off;
	bool per_rank = false;

	BUG_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0);
	/*
         * Calculate the total amount of dimms and csrows/cschannels while
         * in the old API emulation mode
         */
	for (i = 0; i < n_layers; i++) {
		tot_dimms *= layers[i].size;
		if (layers[i].is_virt_csrow)
			tot_csrows *= layers[i].size;
		else
			tot_channels *= layers[i].size;

		if (layers[i].type == EDAC_MC_LAYER_CHIP_SELECT)
			per_rank = true;
	}

	/* Figure out the offsets of the various items from the start of an mc
         * structure.  We want the alignment of each item to be at least as
         * stringent as what the compiler would provide if we could simply
         * hardcode everything into a single struct.
         */
	mci = edac_align_ptr(&ptr, sizeof(*mci), 1);
	layer = edac_align_ptr(&ptr, sizeof(*layer), n_layers);
	for (i = 0; i < n_layers; i++) {
		count *= layers[i].size;
		edac_dbg(4, "errcount layer %d size %d\n", i, count);
		ce_per_layer[i] = edac_align_ptr(&ptr, sizeof(u32), count);
		ue_per_layer[i] = edac_align_ptr(&ptr, sizeof(u32), count);
		tot_errcount += 2 * count;
	}

	edac_dbg(4, "allocating %d error counters\n", tot_errcount);
	pvt = edac_align_ptr(&ptr, sz_pvt, 1);
	size = ((unsigned long)pvt) + sz_pvt;

	edac_dbg(1, "allocating %u bytes for mci data (%d %s, %d csrows/channels)\n",
		 size,
		 tot_dimms,
		 per_rank ? "ranks" : "dimms",
		 tot_csrows * tot_channels);

	mci = kzalloc(size, GFP_KERNEL);
	if (mci == NULL)
		return NULL;

	/* Adjust pointers so they point within the memory we just allocated
         * rather than an imaginary chunk of memory located at address 0.
         */
	layer = (struct edac_mc_layer *)(((char *)mci) + ((unsigned long)layer));
	for (i = 0; i < n_layers; i++) {
		mci->ce_per_layer[i] = (u32 *)((char *)mci + ((unsigned long)ce_per_layer[i]));
		mci->ue_per_layer[i] = (u32 *)((char *)mci + ((unsigned long)ue_per_layer[i]));
	}
	pvt = sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL;

	/* setup index and various internal pointers */
	mci->mc_idx = mc_num;
	mci->tot_dimms = tot_dimms;
	mci->pvt_info = pvt;
	mci->n_layers = n_layers;
	mci->layers = layer;
	memcpy(mci->layers, layers, sizeof(*layer) * n_layers);
	mci->nr_csrows = tot_csrows;
	mci->num_cschannel = tot_channels;
	mci->csbased = per_rank;

	/*
         * Alocate and fill the csrow/channels structs
         */
	mci->csrows = kcalloc(tot_csrows, sizeof(*mci->csrows), GFP_KERNEL);
	if (!mci->csrows)
		goto error;
	for (row = 0; row < tot_csrows; row++) {
		csr = kzalloc(sizeof(**mci->csrows), GFP_KERNEL);
		if (!csr)
			goto error;
		mci->csrows[row] = csr;
		csr->csrow_idx = row;
		csr->mci = mci;
		csr->nr_channels = tot_channels;
		csr->channels = kcalloc(tot_channels, sizeof(*csr->channels),
					GFP_KERNEL);
		if (!csr->channels)
			goto error;

		for (chn = 0; chn < tot_channels; chn++) {
			chan = kzalloc(sizeof(**csr->channels), GFP_KERNEL);
			if (!chan)
				goto error;
			csr->channels[chn] = chan;
			chan->chan_idx = chn;
			chan->csrow = csr;
		}
	}

	/*
         * Allocate and fill the dimm structs
         */
	mci->dimms  = kcalloc(tot_dimms, sizeof(*mci->dimms), GFP_KERNEL);
	if (!mci->dimms)
		goto error;

	memset(&pos, 0, sizeof(pos));
	row = 0;
	chn = 0;
	for (i = 0; i < tot_dimms; i++) {
		chan = mci->csrows[row]->channels[chn];
		off = EDAC_DIMM_OFF(layer, n_layers, pos[0], pos[1], pos[2]);
		if (off < 0 || off >= tot_dimms) {
			edac_mc_printk(mci, KERN_ERR, "EDAC core bug: EDAC_DIMM_OFF is trying to do an illegal data access\n");
			goto error;
		}

		dimm = kzalloc(sizeof(**mci->dimms), GFP_KERNEL);
		if (!dimm)
			goto error;
		mci->dimms[off] = dimm;
		dimm->mci = mci;

		/*
                 * Copy DIMM location and initialize it.
                 */
		len = sizeof(dimm->label);
		p = dimm->label;
		n = snprintf(p, len, "mc#%u", mc_num);
		p += n;
		len -= n;
		for (j = 0; j < n_layers; j++) {
			n = snprintf(p, len, "%s#%u",
				     edac_layer_name[layers[j].type],
				     pos[j]);
			p += n;
			len -= n;
			dimm->location[j] = pos[j];

			if (len <= 0)
				break;
		}

		/* Link it to the csrows old API data */
		chan->dimm = dimm;
		dimm->csrow = row;
		dimm->cschannel = chn;

		/* Increment csrow location */
		if (layers[0].is_virt_csrow) {
			chn++;
			if (chn == tot_channels) {
				chn = 0;
				row++;
			}
		} else {
			row++;
			if (row == tot_csrows) {
				row = 0;
				chn++;
			}
		}

		/* Increment dimm location */
		for (j = n_layers - 1; j >= 0; j--) {
			pos[j]++;
			if (pos[j] < layers[j].size)
				break;
			pos[j] = 0;
		}
	}

	mci->op_state = OP_ALLOC;

	return mci;

error:
	_edac_mc_free(mci);

	return NULL;
}

Contributors
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Mauro Carvalho Chehab94781.29%1050.00%


Doug Thompson13511.59%420.00%


Alan Cox564.81%15.00%


Joe Perches121.03%210.00%


Dan Carpenter80.69%15.00%


Dave Jiang60.52%15.00%


Shaun Ruffell10.09%15.00%


Total1165100.00%20100.00%




EXPORT_SYMBOL_GPL(edac_mc_alloc);




void edac_mc_free(struct mem_ctl_info *mci)
{
	edac_dbg(1, "\n");

	/* If we're not yet registered with sysfs free only what was allocated
         * in edac_mc_alloc().
         */
	if (!device_is_registered(&mci->dev)) {
		_edac_mc_free(mci);
		return;
	}

	/* the mci instance is freed here, when the sysfs object is dropped */
	edac_unregister_sysfs(mci);
}

Contributors
PersonTokensPropCommitsCommitProp
Shaun Ruffell2046.51%116.67%


Mauro Carvalho Chehab2046.51%466.67%


Joe Perches36.98%116.67%


Total43100.00%6100.00%




EXPORT_SYMBOL_GPL(edac_mc_free);




bool edac_has_mcs(void)
{
	bool ret;

	mutex_lock(&mem_ctls_mutex);

	ret = list_empty(&mc_devices);

	mutex_unlock(&mem_ctls_mutex);

	return !ret;
}

Contributors
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Yazen Ghannam34100.00%1100.00%


Total34100.00%1100.00%




EXPORT_SYMBOL_GPL(edac_has_mcs);

/* Caller must hold mem_ctls_mutex */



static struct mem_ctl_info *__find_mci_by_dev(struct device *dev)
{
	struct mem_ctl_info *mci;
	struct list_head *item;

	edac_dbg(3, "\n");

	list_for_each(item, &mc_devices) {
		mci = list_entry(item, struct mem_ctl_info, link);

		if (mci->pdev == dev)
			return mci;
	}

	return NULL;
}


Contributors
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Doug Thompson3351.56%116.67%


Alan Cox2539.06%116.67%


Joe Perches23.12%116.67%


Borislav Petkov23.12%116.67%


Mauro Carvalho Chehab23.12%233.33%


Total64100.00%6100.00%



/**
 * find_mci_by_dev
 *
 *      scan list of controllers looking for the one that manages
 *      the 'dev' device
 * @dev: pointer to a struct device related with the MCI
 */



struct mem_ctl_info *find_mci_by_dev(struct device *dev)
{
	struct mem_ctl_info *ret;

	mutex_lock(&mem_ctls_mutex);
	ret = __find_mci_by_dev(dev);
	mutex_unlock(&mem_ctls_mutex);

	return ret;
}

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Borislav Petkov39100.00%1100.00%


Total39100.00%1100.00%




EXPORT_SYMBOL_GPL(find_mci_by_dev);

/*
 * handler for EDAC to check if NMI type handler has asserted interrupt
 */



static int edac_mc_assert_error_check_and_clear(void)
{
	int old_state;

	if (edac_op_state == EDAC_OPSTATE_POLL)
		return 1;

	old_state = edac_err_assert;
	edac_err_assert = 0;

	return old_state;
}


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Dave Jiang31100.00%2100.00%


Total31100.00%2100.00%



/*
 * edac_mc_workq_function
 *      performs the operation scheduled by a workq request
 */



static void edac_mc_workq_function(struct work_struct *work_req)
{
	struct delayed_work *d_work = to_delayed_work(work_req);
	struct mem_ctl_info *mci = to_edac_mem_ctl_work(d_work);

	mutex_lock(&mem_ctls_mutex);

	if (mci->op_state != OP_RUNNING_POLL) {
		mutex_unlock(&mem_ctls_mutex);
		return;
	}

	if (edac_mc_assert_error_check_and_clear())
		mci->edac_check(mci);

	mutex_unlock(&mem_ctls_mutex);

	/* Queue ourselves again. */
	edac_queue_work(&mci->work, msecs_to_jiffies(edac_mc_get_poll_msec()));
}


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Dave Jiang6574.71%233.33%


Doug Thompson1517.24%116.67%


Borislav Petkov44.60%233.33%


Jean Delvare33.45%116.67%


Total87100.00%6100.00%



/*
 * edac_mc_reset_delay_period(unsigned long value)
 *
 *      user space has updated our poll period value, need to
 *      reset our workq delays
 */



void edac_mc_reset_delay_period(unsigned long value)
{
	struct mem_ctl_info *mci;
	struct list_head *item;

	mutex_lock(&mem_ctls_mutex);

	list_for_each(item, &mc_devices) {
		mci = list_entry(item, struct mem_ctl_info, link);

		if (mci->op_state == OP_RUNNING_POLL)
			edac_mod_work(&mci->work, value);
	}
	mutex_unlock(&mem_ctls_mutex);
}




Contributors
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Doug Thompson3652.17%120.00%


Dave Jiang1927.54%120.00%


Nicholas Krause811.59%120.00%


Borislav Petkov68.70%240.00%


Total69100.00%5100.00%



/* Return 0 on success, 1 on failure.
 * Before calling this function, caller must
 * assign a unique value to mci->mc_idx.
 *
 *      locking model:
 *
 *              called with the mem_ctls_mutex lock held
 */



static int add_mc_to_global_list(struct mem_ctl_info *mci)
{
	struct list_head *item, *insert_before;
	struct mem_ctl_info *p;

	insert_before = &mc_devices;

	p = __find_mci_by_dev(mci->pdev);
	if (unlikely(p != NULL))
		goto fail0;

	list_for_each(item, &mc_devices) {
		p = list_entry(item, struct mem_ctl_info, link);

		if (p->mc_idx >= mci->mc_idx) {
			if (unlikely(p->mc_idx == mci->mc_idx))
				goto fail1;

			insert_before = item;
			break;
		}
	}

	list_add_tail_rcu(&mci->link, insert_before);
	atomic_inc(&edac_handlers);
	return 0;

fail0:
	edac_printk(KERN_WARNING, EDAC_MC,
		"%s (%s) %s %s already assigned %d\n", dev_name(p->pdev),
		edac_dev_name(mci), p->mod_name, p->ctl_name, p->mc_idx);
	return 1;

fail1:
	edac_printk(KERN_WARNING, EDAC_MC,
		"bug in low-level driver: attempt to assign\n"
		"    duplicate mc_idx %d in %s()\n", p->mc_idx, __func__);
	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Doug Thompson15686.19%330.00%


Alan Cox116.08%110.00%


Dave Jiang73.87%220.00%


Kay Sievers31.66%110.00%


Mauro Carvalho Chehab21.10%110.00%


Borislav Petkov10.55%110.00%


Stephen Rothwell10.55%110.00%


Total181100.00%10100.00%






static int del_mc_from_global_list(struct mem_ctl_info *mci)
{
	int handlers = atomic_dec_return(&edac_handlers);
	list_del_rcu(&mci->link);

	/* these are for safe removal of devices from global list while
         * NMI handlers may be traversing list
         */
	synchronize_rcu();
	INIT_LIST_HEAD(&mci->link);

	return handlers;
}


Contributors
PersonTokensPropCommitsCommitProp
Doug Thompson1534.88%120.00%


Mauro Carvalho Chehab920.93%120.00%


Alan Cox920.93%120.00%


Lai Jiangshan613.95%120.00%


Dave Jiang49.30%120.00%


Total43100.00%5100.00%






struct mem_ctl_info *edac_mc_find(int idx)
{
	struct mem_ctl_info *mci = NULL;
	struct list_head *item;

	mutex_lock(&mem_ctls_mutex);

	list_for_each(item, &mc_devices) {
		mci = list_entry(item, struct mem_ctl_info, link);

		if (mci->mc_idx >= idx) {
			if (mci->mc_idx == idx) {
				goto unlock;
			}