Enabling irq wake could potentially fail and calling disable_irq_wake
after a failed call to enable_irq_wake could result in an unbalanced irq
warning. This patch warns if enable_irq_wake fails and avoids other
potential issues caused by calling disable_irq_wake on resume after
enable_irq_wake failed during suspend.
Signed-off-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
---
This patch is based on Jiri's for-4.3/i2c-hid and needs Gabriele Mazzotta's
patch which moves where the HID driver's suspend callback call to apply
cleanly.
drivers/hid/i2c-hid/i2c-hid.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 9ed69b5..2871f3c 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -149,6 +149,8 @@ struct i2c_hid {
int irq;
struct i2c_hid_platform_data pdata;
+
+ bool irq_wake_enabled;
};
static int __i2c_hid_command(struct i2c_client *client,
@@ -1091,13 +1093,20 @@ static int i2c_hid_suspend(struct device *dev)
struct i2c_hid *ihid = i2c_get_clientdata(client);
struct hid_device *hid = ihid->hid;
int ret = 0;
+ int wake_status;
if (hid->driver && hid->driver->suspend)
ret = hid->driver->suspend(hid, PMSG_SUSPEND);
disable_irq(ihid->irq);
- if (device_may_wakeup(&client->dev))
- enable_irq_wake(ihid->irq);
+ if (device_may_wakeup(&client->dev)) {
+ wake_status = enable_irq_wake(ihid->irq);
+ if (!wake_status)
+ ihid->irq_wake_enabled = true;
+ else
+ hid_warn(hid, "Failed to enable irq wake: %d\n",
+ wake_status);
+ }
/* Save some power */
i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
@@ -1111,14 +1120,21 @@ static int i2c_hid_resume(struct device *dev)
struct i2c_client *client = to_i2c_client(dev);
struct i2c_hid *ihid = i2c_get_clientdata(client);
struct hid_device *hid = ihid->hid;
+ int wake_status;
enable_irq(ihid->irq);
ret = i2c_hid_hwreset(client);
if (ret)
return ret;
- if (device_may_wakeup(&client->dev))
- disable_irq_wake(ihid->irq);
+ if (device_may_wakeup(&client->dev) && ihid->irq_wake_enabled) {
+ wake_status = disable_irq_wake(ihid->irq);
+ if (!wake_status)
+ ihid->irq_wake_enabled = false;
+ else
+ hid_warn(hid, "Failed to disable irq wake: %d\n",
+ wake_status);
+ }
if (hid->driver && hid->driver->reset_resume) {
ret = hid->driver->reset_resume(hid);
--
2.1.4
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