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soundwire: bus: fix device number leak on errors 

If the programming of the dev_number fails due to an IO error, a new
device_number will be assigned, resulting in a leak.

Make sure we only assign a device_number once per Slave device.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200113225637.17313-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-01-13 16:56:37 -06:00 committed by Vinod Koul
parent 78f6fdd616
commit fd6a3ac8e8
2 changed files with 26 additions and 15 deletions
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15
drivers/soundwire/bus.c
View File

@ -456,9 +456,11 @@ static int sdw_get_device_num(struct sdw_slave *slave)
static int sdw_assign_device_num(struct sdw_slave *slave)
{
int ret, dev_num;
bool new_device = false;
/* check first if device number is assigned, if so reuse that */
if (!slave->dev_num) {
if (!slave->dev_num_sticky) {
mutex_lock(&slave->bus->bus_lock);
dev_num = sdw_get_device_num(slave);
mutex_unlock(&slave->bus->bus_lock);
@ -467,15 +469,22 @@ static int sdw_assign_device_num(struct sdw_slave *slave)
dev_num);
return dev_num;
}
slave->dev_num = dev_num;
slave->dev_num_sticky = dev_num;
new_device = true;
} else {
slave->dev_num = slave->dev_num_sticky;
}
}
if (!new_device)
dev_info(slave->bus->dev,
"Slave already registered dev_num:%d\n",
"Slave already registered, reusing dev_num:%d\n",
slave->dev_num);
/* Clear the slave->dev_num to transfer message on device 0 */
dev_num = slave->dev_num;
slave->dev_num = 0;
}
ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num);
if (ret < 0) {
@ -485,7 +494,7 @@ static int sdw_assign_device_num(struct sdw_slave *slave)
}
/* After xfer of msg, restore dev_num */
slave->dev_num = dev_num;
slave->dev_num = slave->dev_num_sticky;
return 0;
}

4
include/linux/soundwire/sdw.h
View File

@ -546,7 +546,8 @@ struct sdw_slave_ops {
* @debugfs: Slave debugfs
* @node: node for bus list
* @port_ready: Port ready completion flag for each Slave port
* @dev_num: Device Number assigned by Bus
* @dev_num: Current Device Number, values can be 0 or dev_num_sticky
* @dev_num_sticky: one-time static Device Number assigned by Bus
* @probed: boolean tracking driver state
* @probe_complete: completion utility to control potential races
* on startup between driver probe/initialization and SoundWire
@ -575,6 +576,7 @@ struct sdw_slave {
struct list_head node;
struct completion *port_ready;
u16 dev_num;
u16 dev_num_sticky;
bool probed;
struct completion probe_complete;
struct completion enumeration_complete;