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[media] rtl2832: implement own lock for regmap

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Introduce own lock to silence lockdep warning. lockdep validator
makes wrong decision when two similar (&map->mutex) locks were taken
recursively, even those are different mutexes in a two different
drivers. After that patch, functionality remains same, but mutex names
are different. That is a temporary hack, proper solution is make
regmap aware of locked nested locking rules.

=============================================
[ INFO: possible recursive locking detected ]
3.18.0-rc4+ #4 Tainted: G           O
---------------------------------------------
kdvb-ad-0-fe-0/2814 is trying to acquire lock:
 (&map->mutex){+.+.+.}, at: [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40

but task is already holding lock:
 (&map->mutex){+.+.+.}, at: [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40

other info that might help us debug this:
 Possible unsafe locking scenario:
       CPU0
       ----
  lock(&map->mutex);
  lock(&map->mutex);

 *** DEADLOCK ***
 May be due to missing lock nesting notation
1 lock held by kdvb-ad-0-fe-0/2814:
 #0:  (&map->mutex){+.+.+.}, at: [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40

stack backtrace:
CPU: 3 PID: 2814 Comm: kdvb-ad-0-fe-0 Tainted: G           O 3.18.0-rc4+ #4
Hardware name: System manufacturer System Product Name/M5A78L-M/USB3, BIOS 2001    09/11/2014
 0000000000000000 00000000410c8772 ffff880293af3868 ffffffff817a6f82
 0000000000000000 ffff8800b3462be0 ffff880293af3968 ffffffff810e7f94
 ffff880293af3888 00000000410c8772 ffffffff82dfee60 ffffffff81ab8f89
Call Trace:
 [<ffffffff817a6f82>] dump_stack+0x4e/0x68
 [<ffffffff810e7f94>] __lock_acquire+0x1ea4/0x1f50
 [<ffffffff810e2a7d>] ? trace_hardirqs_off+0xd/0x10
 [<ffffffff817b01f3>] ? _raw_spin_lock_irqsave+0x83/0xa0
 [<ffffffff810e13e6>] ? up+0x16/0x50
 [<ffffffff810e2a7d>] ? trace_hardirqs_off+0xd/0x10
 [<ffffffff817af8bf>] ? _raw_spin_unlock_irqrestore+0x5f/0x70
 [<ffffffff810e9069>] lock_acquire+0xc9/0x170
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff817ab50e>] mutex_lock_nested+0x7e/0x430
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff817a530b>] ? printk+0x70/0x86
 [<ffffffff8110d9e8>] ? mod_timer+0x168/0x240
 [<ffffffff814ec90f>] regmap_lock_mutex+0x2f/0x40
 [<ffffffff814f08d9>] regmap_update_bits+0x29/0x60
 [<ffffffffa03e9778>] rtl2832_select+0x38/0x70 [rtl2832]
 [<ffffffffa039b03d>] i2c_mux_master_xfer+0x3d/0x90 [i2c_mux]
 [<ffffffff815da493>] __i2c_transfer+0x73/0x2e0
 [<ffffffff815dbaba>] i2c_transfer+0x5a/0xc0
 [<ffffffff815dbb6e>] i2c_master_send+0x4e/0x70
 [<ffffffffa03ff25a>] regmap_i2c_write+0x1a/0x50 [regmap_i2c]
 [<ffffffff817ab713>] ? mutex_lock_nested+0x283/0x430
 [<ffffffff814f06b2>] _regmap_raw_write+0x862/0x880
 [<ffffffff814ec90f>] ? regmap_lock_mutex+0x2f/0x40
 [<ffffffff814f0744>] _regmap_bus_raw_write+0x74/0xa0
 [<ffffffff814ef3d2>] _regmap_write+0x92/0x140
 [<ffffffff814f0b7b>] regmap_write+0x4b/0x70
 [<ffffffffa032b090>] ? dvb_frontend_release+0x110/0x110 [dvb_core]
 [<ffffffffa05141d4>] e4000_init+0x34/0x210 [e4000]
 [<ffffffffa032a029>] dvb_frontend_init+0x59/0xc0 [dvb_core]
 [<ffffffff810bde30>] ? finish_task_switch+0x80/0x180
 [<ffffffff810bddf2>] ? finish_task_switch+0x42/0x180
 [<ffffffffa032b116>] dvb_frontend_thread+0x86/0x7b0 [dvb_core]
 [<ffffffff817a9203>] ? __schedule+0x343/0x930
 [<ffffffffa032b090>] ? dvb_frontend_release+0x110/0x110 [dvb_core]
 [<ffffffff810b826b>] kthread+0x10b/0x130
 [<ffffffff81020099>] ? sched_clock+0x9/0x10
 [<ffffffff810b8160>] ? kthread_create_on_node+0x250/0x250
 [<ffffffff817b063c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810b8160>] ? kthread_create_on_node+0x250/0x250

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-12-18 07:22:46 -03:00 committed by Mauro Carvalho Chehab
parent 670ef05f82
commit b410dae43c
2 changed files with 40 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/media/dvb-frontends/rtl2832.c
View File

@ -1028,6 +1028,32 @@ static int rtl2832_regmap_gather_write(void *context, const void *reg,
return 0;
}
/*
* FIXME: Hack. Implement own regmap locking in order to silence lockdep
* recursive lock warning. That happens when regmap I2C client calls I2C mux
* adapter, which leads demod I2C repeater enable via demod regmap. Operation
* takes two regmap locks recursively - but those are different regmap instances
* in a two different I2C drivers, so it is not deadlock. Proper fix is to make
* regmap aware of lockdep.
*/
static void rtl2832_regmap_lock(void *__dev)
{
struct rtl2832_dev *dev = __dev;
struct i2c_client *client = dev->client;
dev_dbg(&client->dev, "\n");
mutex_lock(&dev->regmap_mutex);
}
static void rtl2832_regmap_unlock(void *__dev)
{
struct rtl2832_dev *dev = __dev;
struct i2c_client *client = dev->client;
dev_dbg(&client->dev, "\n");
mutex_unlock(&dev->regmap_mutex);
}
static struct dvb_frontend *rtl2832_get_dvb_frontend(struct i2c_client *client)
{
struct rtl2832_dev *dev = i2c_get_clientdata(client);
@ -1186,15 +1212,6 @@ static int rtl2832_probe(struct i2c_client *client,
.range_max = 5 * 0x100,
},
};
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = rtl2832_volatile_reg,
.max_register = 5 * 0x100,
.ranges = regmap_range_cfg,
.num_ranges = ARRAY_SIZE(regmap_range_cfg),
.cache_type = REGCACHE_RBTREE,
};
dev_dbg(&client->dev, "\n");
@ -1213,8 +1230,19 @@ static int rtl2832_probe(struct i2c_client *client,
INIT_DELAYED_WORK(&dev->i2c_gate_work, rtl2832_i2c_gate_work);
INIT_DELAYED_WORK(&dev->stat_work, rtl2832_stat_work);
/* create regmap */
mutex_init(&dev->regmap_mutex);
dev->regmap_config.reg_bits = 8,
dev->regmap_config.val_bits = 8,
dev->regmap_config.lock = rtl2832_regmap_lock,
dev->regmap_config.unlock = rtl2832_regmap_unlock,
dev->regmap_config.lock_arg = dev,
dev->regmap_config.volatile_reg = rtl2832_volatile_reg,
dev->regmap_config.max_register = 5 * 0x100,
dev->regmap_config.ranges = regmap_range_cfg,
dev->regmap_config.num_ranges = ARRAY_SIZE(regmap_range_cfg),
dev->regmap_config.cache_type = REGCACHE_RBTREE,
dev->regmap = regmap_init(&client->dev, &regmap_bus, client,
&regmap_config);
&dev->regmap_config);
if (IS_ERR(dev->regmap)) {
ret = PTR_ERR(dev->regmap);
goto err_kfree;

2
drivers/media/dvb-frontends/rtl2832_priv.h
View File

@ -33,6 +33,8 @@
struct rtl2832_dev {
struct rtl2832_platform_data *pdata;
struct i2c_client *client;
struct mutex regmap_mutex;
struct regmap_config regmap_config;
struct regmap *regmap;
struct i2c_adapter *i2c_adapter_tuner;
struct dvb_frontend fe;