From: Hans de Goede hdegoede@redhat.com
stable inclusion from stable-v5.10.104 commit a621ae6394ce05177fa9941da1a9b465c9c47d31 bugzilla: https://gitee.com/openeuler/kernel/issues/I56XAC
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 04b7762e37c95d9b965d16bb0e18dbd1fa2e2861 upstream.
Before these changes elan_suspend() would only disable the regulator when device_may_wakeup() returns false; whereas elan_resume() would unconditionally enable it, leading to an enable count imbalance when device_may_wakeup() returns true.
This triggers the "WARN_ON(regulator->enable_count)" in regulator_put() when the elan_i2c driver gets unbound, this happens e.g. with the hot-plugable dock with Elan I2C touchpad for the Asus TF103C 2-in-1.
Fix this by making the regulator_enable() call also be conditional on device_may_wakeup() returning false.
Signed-off-by: Hans de Goede hdegoede@redhat.com Link: https://lore.kernel.org/r/20220131135436.29638-2-hdegoede@redhat.com Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yu Liao liaoyu15@huawei.com Reviewed-by: Wei Li liwei391@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/input/mouse/elan_i2c_core.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c index 4ee077d02d40..6f59c8b245f2 100644 --- a/drivers/input/mouse/elan_i2c_core.c +++ b/drivers/input/mouse/elan_i2c_core.c @@ -1350,17 +1350,17 @@ static int __maybe_unused elan_resume(struct device *dev) struct elan_tp_data *data = i2c_get_clientdata(client); int error;
- if (device_may_wakeup(dev) && data->irq_wake) { + if (!device_may_wakeup(dev)) { + error = regulator_enable(data->vcc); + if (error) { + dev_err(dev, "error %d enabling regulator\n", error); + goto err; + } + } else if (data->irq_wake) { disable_irq_wake(client->irq); data->irq_wake = false; }
- error = regulator_enable(data->vcc); - if (error) { - dev_err(dev, "error %d enabling regulator\n", error); - goto err; - } - error = elan_set_power(data, true); if (error) { dev_err(dev, "power up when resuming failed: %d\n", error);