4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Even Xu <even.xu@xxxxxxxxx>
commit ebeaa367548e9e92dd9374b9464ff6e7d157117b upstream.
Current ISH driver only registers suspend/resume PM callbacks which don't
support hibernation (suspend to disk). Basically after hiberation, the ISH
can't resume properly and user may not see sensor events (for example: screen
rotation may not work).
User will not see a crash or panic or anything except the following message
in log:
hid-sensor-hub 001F:8086:22D8.0001: timeout waiting for response from ISHTP device
So this patch adds support for S4/hiberbation to ISH by using the
SIMPLE_DEV_PM_OPS() MACRO instead of struct dev_pm_ops directly. The suspend
and resume functions will now be used for both suspend to RAM and hibernation.
If power management is disabled, SIMPLE_DEV_PM_OPS will do nothing, the suspend
and resume related functions won't be used, so mark them as __maybe_unused to
clarify that this is the intended behavior, and remove #ifdefs for power
management.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Even Xu <even.xu@xxxxxxxxx>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/intel-ish-hid/ipc/pci-ish.c | 22 +++++++---------------
1 file changed, 7 insertions(+), 15 deletions(-)
--- a/drivers/hid/intel-ish-hid/ipc/pci-ish.c
+++ b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
@@ -202,8 +202,7 @@ static void ish_remove(struct pci_dev *p
kfree(ishtp_dev);
}
-#ifdef CONFIG_PM
-static struct device *ish_resume_device;
+static struct device __maybe_unused *ish_resume_device;
/**
* ish_resume_handler() - Work function to complete resume
@@ -214,7 +213,7 @@ static struct device *ish_resume_device;
* in that case a simple resume message is enough, others we need
* a reset sequence.
*/
-static void ish_resume_handler(struct work_struct *work)
+static void __maybe_unused ish_resume_handler(struct work_struct *work)
{
struct pci_dev *pdev = to_pci_dev(ish_resume_device);
struct ishtp_device *dev = pci_get_drvdata(pdev);
@@ -245,7 +244,7 @@ static void ish_resume_handler(struct wo
*
* Return: 0 to the pm core
*/
-static int ish_suspend(struct device *device)
+static int __maybe_unused ish_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct ishtp_device *dev = pci_get_drvdata(pdev);
@@ -271,7 +270,7 @@ static int ish_suspend(struct device *de
return 0;
}
-static DECLARE_WORK(resume_work, ish_resume_handler);
+static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
/**
* ish_resume() - ISH resume callback
* @device: device pointer
@@ -280,7 +279,7 @@ static DECLARE_WORK(resume_work, ish_res
*
* Return: 0 to the pm core
*/
-static int ish_resume(struct device *device)
+static int __maybe_unused ish_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct ishtp_device *dev = pci_get_drvdata(pdev);
@@ -294,21 +293,14 @@ static int ish_resume(struct device *dev
return 0;
}
-static const struct dev_pm_ops ish_pm_ops = {
- .suspend = ish_suspend,
- .resume = ish_resume,
-};
-#define ISHTP_ISH_PM_OPS (&ish_pm_ops)
-#else
-#define ISHTP_ISH_PM_OPS NULL
-#endif /* CONFIG_PM */
+static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
static struct pci_driver ish_driver = {
.name = KBUILD_MODNAME,
.id_table = ish_pci_tbl,
.probe = ish_probe,
.remove = ish_remove,
- .driver.pm = ISHTP_ISH_PM_OPS,
+ .driver.pm = &ish_pm_ops,
};
module_pci_driver(ish_driver);
