The patch titled
PNP: do not stop/start devices in suspend/resume path
has been added to the -mm tree. Its filename is
pnp-do-not-stop-start-devices-in-suspend-resume-path.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PNP: do not stop/start devices in suspend/resume path
From: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
Do not disable PNP devices in the suspend path. We still call the driver's
suspend method, which should prevent further use of the device, and the
protocol suspend method, which may put the device in a low-power state.
I'm told that Windows puts devices in a low-power state (Linux does this in
the protocol suspend method), but does not use _DIS in the suspend path.
Other relevant references:
- In the ACPI 3.0b spec, I can't find any mention of _DIS in
connection with sleep. And Device Object Notifications,
Section 5.6.3, Table 5-43, says we should get a bus check
after awakening if hardware was removed while we slept.
- This: http://msdn2.microsoft.com/en-us/library/ms810079.aspx
makes a similar point about how the OS re-enumerates devices
as a result of a power state change (3rd last paragraph of
text).
- This: http://msdn2.microsoft.com/en-us/library/aa489874.aspx
suggests that Windows only stops a device to rebalance hardware
resources.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
Cc: Jiri Slaby <jirislaby@xxxxxxxxx>
Cc: Adam Belay <ambx1@xxxxxxxxxx>
Cc: Li Shaohua <shaohua.li@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/pnp/driver.c | 14 --------------
1 file changed, 14 deletions(-)
diff -puN drivers/pnp/driver.c~pnp-do-not-stop-start-devices-in-suspend-resume-path drivers/pnp/driver.c
--- a/drivers/pnp/driver.c~pnp-do-not-stop-start-devices-in-suspend-resume-path
+++ a/drivers/pnp/driver.c
@@ -161,13 +161,6 @@ static int pnp_bus_suspend(struct device
return error;
}
- if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
- pnp_can_disable(pnp_dev)) {
- error = pnp_stop_dev(pnp_dev);
- if (error)
- return error;
- }
-
if (pnp_dev->protocol && pnp_dev->protocol->suspend)
pnp_dev->protocol->suspend(pnp_dev, state);
return 0;
@@ -177,7 +170,6 @@ static int pnp_bus_resume(struct device
{
struct pnp_dev *pnp_dev = to_pnp_dev(dev);
struct pnp_driver *pnp_drv = pnp_dev->driver;
- int error;
if (!pnp_drv)
return 0;
@@ -185,12 +177,6 @@ static int pnp_bus_resume(struct device
if (pnp_dev->protocol && pnp_dev->protocol->resume)
pnp_dev->protocol->resume(pnp_dev);
- if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
- error = pnp_start_dev(pnp_dev);
- if (error)
- return error;
- }
-
if (pnp_drv->resume)
return pnp_drv->resume(pnp_dev);
_
Patches currently in -mm which might be from bjorn.helgaas@xxxxxx are
small-acpica-extension-to-be-able-to-store-the-name-of.patch
export-acpi_check_resource_conflict.patch
mm-only-enforce-acpi-resource-conflict-checks.patch
serial-keep-the-dtr-setting-for-serial-console.patch
rtc-cmos-exports-nvram-in-sysfs.patch
pnp-simplify-pnp_activate_dev-and-pnp_disable_dev-return-values.patch
declare-pnp-option-parsing-functions-as-__init.patch
declare-pnp-option-parsing-functions-as-__init-checkpatch-fixes.patch
isapnp-driver-semaphore-to-mutex.patch
isapnp-driver-semaphore-to-mutex-fix.patch
isapnp-driver-semaphore-to-mutex-fix-fix.patch
pnp-do-not-stop-start-devices-in-suspend-resume-path.patch
dont-touch-fs_struct-in-drivers.patch
-
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