#include <linux/module.h>

#include "notifier-error-inject.h"

static int debugfs_errno_set(void *data, u64 val)
{
	*(int *)data = clamp_t(int, val, -MAX_ERRNO, 0);
	return 0;
}

static int debugfs_errno_get(void *data, u64 *val)
{
	*val = *(int *)data;
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(fops_errno, debugfs_errno_get, debugfs_errno_set,
			"%lld\n");

static struct dentry *debugfs_create_errno(const char *name, umode_t mode,
				struct dentry *parent, int *value)
{
	return debugfs_create_file(name, mode, parent, value, &fops_errno);
}

static int notifier_err_inject_callback(struct notifier_block *nb,
				unsigned long val, void *p)
{
	int err = 0;
	struct notifier_err_inject *err_inject =
		container_of(nb, struct notifier_err_inject, nb);
	struct notifier_err_inject_action *action;

	for (action = err_inject->actions; action->name; action++) {
		if (action->val == val) {
			err = action->error;
			break;
		}
	}
	if (err)
		pr_info("Injecting error (%d) to %s\n", err, action->name);

	return notifier_from_errno(err);
}

struct dentry *notifier_err_inject_dir;
EXPORT_SYMBOL_GPL(notifier_err_inject_dir);

struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent,
			struct notifier_err_inject *err_inject, int priority)
{
	struct notifier_err_inject_action *action;
	umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
	struct dentry *dir;
	struct dentry *actions_dir;

	err_inject->nb.notifier_call = notifier_err_inject_callback;
	err_inject->nb.priority = priority;

	dir = debugfs_create_dir(name, parent);
	if (!dir)
		return ERR_PTR(-ENOMEM);

	actions_dir = debugfs_create_dir("actions", dir);
	if (!actions_dir)
		goto fail;

	for (action = err_inject->actions; action->name; action++) {
		struct dentry *action_dir;

		action_dir = debugfs_create_dir(action->name, actions_dir);
		if (!action_dir)
			goto fail;

		/*
		 * Create debugfs r/w file containing action->error. If
		 * notifier call chain is called with action->val, it will
		 * fail with the error code
		 */
		if (!debugfs_create_errno("error", mode, action_dir,
					&action->error))
			goto fail;
	}
	return dir;
fail:
	debugfs_remove_recursive(dir);
	return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL_GPL(notifier_err_inject_init);

static int __init err_inject_init(void)
{
	notifier_err_inject_dir =
		debugfs_create_dir("notifier-error-inject", NULL);

	if (!notifier_err_inject_dir)
		return -ENOMEM;

	return 0;
}

static void __exit err_inject_exit(void)
{
	debugfs_remove_recursive(notifier_err_inject_dir);
}

module_init(err_inject_init);
module_exit(err_inject_exit);

MODULE_DESCRIPTION("Notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
ea1e7b210a2c'>include</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='68b24a20cbf0a9fb691031506ff7ea1e7b210a2c'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Lars-Peter Clausen &lt;lars@metafoo.de&gt;</td><td class='right'>2016-10-15 19:32:54 +0200</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-10-24 18:36:42 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=68b24a20cbf0a9fb691031506ff7ea1e7b210a2c'>68b24a20cbf0a9fb691031506ff7ea1e7b210a2c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include?id=68b24a20cbf0a9fb691031506ff7ea1e7b210a2c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=68b24a20cbf0a9fb691031506ff7ea1e7b210a2c'>c6116f2f25f0eeb561e117d4e0e0f9444aeac5c2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include?id=68b24a20cbf0a9fb691031506ff7ea1e7b210a2c'>include</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=1001354ca34179f3db924eb66672442a173147dc'>1001354ca34179f3db924eb66672442a173147dc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include?id=68b24a20cbf0a9fb691031506ff7ea1e7b210a2c&amp;id2=1001354ca34179f3db924eb66672442a173147dc'>diff</a>)</td></tr></table>
<div class='commit-subject'>ASoC: wm8753: Remove unused DAI ID defines</div><div class='commit-msg'>The DAI ID defines are back from the time when DAIs were referenced by a
numerical ID. These days a string is used for matching instead and the
defines are unused. These particular IDs were never used and presumably
never will be, so remove them.

Signed-off-by: Lars-Peter Clausen &lt;lars@metafoo.de&gt;
Acked-by: Charles Keepax &lt;ckeepax@opensource.wolfsonmicro.com&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=68b24a20cbf0a9fb691031506ff7ea1e7b210a2c'>Diffstat</a> (limited to 'include')</div><table summary='diffstat' class='diffstat'>