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usb: typec: ucsi: ccg: Remove run_isr flag 

The "run_isr" flag is used for preventing the driver from
calling the interrupt service routine in its runtime resume
callback when the driver is expecting completion to a
command, but what that basically does is that it hides the
real problem. The real problem is that the controller is
allowed to suspend in the middle of command execution.

As a more appropriate fix for the problem, using autosuspend
delay time that matches UCSI_TIMEOUT_MS (5s). That prevents
the controller from suspending while still in the middle of
executing a command.

This fixes a potential deadlock. Both ccg_read() and
ccg_write() are called with the mutex already taken at least
from ccg_send_command(). In ccg_read() and ccg_write, the
mutex is only acquired so that run_isr flag can be set.

Fixes: f0e4cd948b ("usb: typec: ucsi: ccg: add runtime pm workaround")
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20191004100219.71152-2-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-10-04 13:02:18 +03:00 committed by Greg Kroah-Hartman
parent c9a2baa796
commit 8530e4e20e
1 changed files with 4 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/usb/typec/ucsi/ucsi_ccg.c
View File

@ -195,7 +195,6 @@ struct ucsi_ccg {
/* fw build with vendor information */
u16 fw_build;
bool run_isr; /* flag to call ISR routine during resume */
struct work_struct pm_work;
};
@ -224,18 +223,6 @@ static int ccg_read(struct ucsi_ccg *uc, u16 rab, u8 *data, u32 len)
if (quirks && quirks->max_read_len)
max_read_len = quirks->max_read_len;
if (uc->fw_build == CCG_FW_BUILD_NVIDIA &&
uc->fw_version <= CCG_OLD_FW_VERSION) {
mutex_lock(&uc->lock);
/*
* Do not schedule pm_work to run ISR in
* ucsi_ccg_runtime_resume() after pm_runtime_get_sync()
* since we are already in ISR path.
*/
uc->run_isr = false;
mutex_unlock(&uc->lock);
}
pm_runtime_get_sync(uc->dev);
while (rem_len > 0) {
msgs[1].buf = &data[len - rem_len];
@ -278,18 +265,6 @@ static int ccg_write(struct ucsi_ccg *uc, u16 rab, u8 *data, u32 len)
msgs[0].len = len + sizeof(rab);
msgs[0].buf = buf;
if (uc->fw_build == CCG_FW_BUILD_NVIDIA &&
uc->fw_version <= CCG_OLD_FW_VERSION) {
mutex_lock(&uc->lock);
/*
* Do not schedule pm_work to run ISR in
* ucsi_ccg_runtime_resume() after pm_runtime_get_sync()
* since we are already in ISR path.
*/
uc->run_isr = false;
mutex_unlock(&uc->lock);
}
pm_runtime_get_sync(uc->dev);
status = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (status < 0) {
@ -1130,7 +1105,6 @@ static int ucsi_ccg_probe(struct i2c_client *client,
uc->ppm.sync = ucsi_ccg_sync;
uc->dev = dev;
uc->client = client;
uc->run_isr = true;
mutex_init(&uc->lock);
INIT_WORK(&uc->work, ccg_update_firmware);
INIT_WORK(&uc->pm_work, ccg_pm_workaround_work);
@ -1188,6 +1162,8 @@ static int ucsi_ccg_probe(struct i2c_client *client,
pm_runtime_set_active(uc->dev);
pm_runtime_enable(uc->dev);
pm_runtime_use_autosuspend(uc->dev);
pm_runtime_set_autosuspend_delay(uc->dev, 5000);
pm_runtime_idle(uc->dev);
return 0;
@ -1229,7 +1205,6 @@ static int ucsi_ccg_runtime_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ucsi_ccg *uc = i2c_get_clientdata(client);
bool schedule = true;
/*
* Firmware version 3.1.10 or earlier, built for NVIDIA has known issue
@ -1237,17 +1212,8 @@ static int ucsi_ccg_runtime_resume(struct device *dev)
* Schedule a work to call ISR as a workaround.
*/
if (uc->fw_build == CCG_FW_BUILD_NVIDIA &&
uc->fw_version <= CCG_OLD_FW_VERSION) {
mutex_lock(&uc->lock);
if (!uc->run_isr) {
uc->run_isr = true;
schedule = false;
}
mutex_unlock(&uc->lock);
if (schedule)
schedule_work(&uc->pm_work);
}
uc->fw_version <= CCG_OLD_FW_VERSION)
schedule_work(&uc->pm_work);
return 0;
}