/*
 * Functions for the OPL4 proc file
 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include "opl4_local.h"
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <sound/info.h>

static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
				  unsigned short mode, void **file_private_data)
{
	struct snd_opl4 *opl4 = entry->private_data;

	mutex_lock(&opl4->access_mutex);
	if (opl4->memory_access) {
		mutex_unlock(&opl4->access_mutex);
		return -EBUSY;
	}
	opl4->memory_access++;
	mutex_unlock(&opl4->access_mutex);
	return 0;
}

static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
				     unsigned short mode, void *file_private_data)
{
	struct snd_opl4 *opl4 = entry->private_data;

	mutex_lock(&opl4->access_mutex);
	opl4->memory_access--;
	mutex_unlock(&opl4->access_mutex);
	return 0;
}

static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
				      void *file_private_data,
				      struct file *file, char __user *_buf,
				      size_t count, loff_t pos)
{
	struct snd_opl4 *opl4 = entry->private_data;
	char* buf;

	buf = vmalloc(count);
	if (!buf)
		return -ENOMEM;
	snd_opl4_read_memory(opl4, buf, pos, count);
	if (copy_to_user(_buf, buf, count)) {
		vfree(buf);
		return -EFAULT;
	}
	vfree(buf);
	return count;
}

static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
				       void *file_private_data,
				       struct file *file,
				       const char __user *_buf,
				       size_t count, loff_t pos)
{
	struct snd_opl4 *opl4 = entry->private_data;
	char *buf;

	buf = vmalloc(count);
	if (!buf)
		return -ENOMEM;
	if (copy_from_user(buf, _buf, count)) {
		vfree(buf);
		return -EFAULT;
	}
	snd_opl4_write_memory(opl4, buf, pos, count);
	vfree(buf);
	return count;
}

static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
	.open = snd_opl4_mem_proc_open,
	.release = snd_opl4_mem_proc_release,
	.read = snd_opl4_mem_proc_read,
	.write = snd_opl4_mem_proc_write,
};

int snd_opl4_create_proc(struct snd_opl4 *opl4)
{
	struct snd_info_entry *entry;

	entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
	if (entry) {
		if (opl4->hardware < OPL3_HW_OPL4_ML) {
			/* OPL4 can access 4 MB external ROM/SRAM */
			entry->mode |= S_IWUSR;
			entry->size = 4 * 1024 * 1024;
		} else {
			/* OPL4-ML has 1 MB internal ROM */
			entry->size = 1 * 1024 * 1024;
		}
		entry->content = SNDRV_INFO_CONTENT_DATA;
		entry->c.ops = &snd_opl4_mem_proc_ops;
		entry->module = THIS_MODULE;
		entry->private_data = opl4;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	opl4->proc_entry = entry;
	return 0;
}

void snd_opl4_free_proc(struct snd_opl4 *opl4)
{
	snd_info_free_entry(opl4->proc_entry);
}
</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>Filipe Manana &lt;fdmanana@suse.com&gt;</td><td class='right'>2016-11-24 02:09:04 +0000</td></tr>
<tr><th>committer</th><td>Filipe Manana &lt;fdmanana@suse.com&gt;</td><td class='right'>2016-11-25 18:06:50 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=8d9eddad19467b008e0c881bc3133d7da94b7ec1'>8d9eddad19467b008e0c881bc3133d7da94b7ec1</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=8d9eddad19467b008e0c881bc3133d7da94b7ec1'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=8d9eddad19467b008e0c881bc3133d7da94b7ec1'>59713176da0ae96b4f0b53afe000201657382907</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=f177d73949bf758542ca15a1c1945bd2e802cc65'>f177d73949bf758542ca15a1c1945bd2e802cc65</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=8d9eddad19467b008e0c881bc3133d7da94b7ec1&amp;id2=f177d73949bf758542ca15a1c1945bd2e802cc65'>diff</a>)</td></tr></table>
<div class='commit-subject'>Btrfs: fix qgroup rescan worker initialization</div><div class='commit-msg'>We were setting the qgroup_rescan_running flag to true only after the
rescan worker started (which is a task run by a queue). So if a user
space task starts a rescan and immediately after asks to wait for the
rescan worker to finish, this second call might happen before the rescan
worker task starts running, in which case the rescan wait ioctl returns
immediatley, not waiting for the rescan worker to finish.

This was making the fstest btrfs/022 fail very often.

Fixes: d2c609b834d6 (btrfs: properly track when rescan worker is running)
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Filipe Manana &lt;fdmanana@suse.com&gt;
Reviewed-by: David Sterba &lt;dsterba@suse.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=8d9eddad19467b008e0c881bc3133d7da94b7ec1'>Diffstat</a></div><table summary='diffstat' class='diffstat'>