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authorAndrew Duggan <aduggan@synaptics.com>2015-07-30 23:49:00 +0200
committerJiri Kosina <jkosina@suse.cz>2015-08-18 15:19:45 +0200
commitd1c48038b849e9df0475621a52193a62424a4e87 (patch)
treeb26a9257964727a0dcf7dc2c85fe791b4d17c64e /drivers/hid/i2c-hid/i2c-hid.c
parentHID: i2c-hid: Call device suspend callback before disabling irq (diff)
downloadlinux-d1c48038b849e9df0475621a52193a62424a4e87.tar.xz
linux-d1c48038b849e9df0475621a52193a62424a4e87.zip
HID: i2c-hid: Only disable irq wake if it was successfully enabled during suspend
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@synaptics.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/i2c-hid/i2c-hid.c')
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 9ed69b5121f7..2871f3c81a4c 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);