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Date: Tue, 27 Sep 2011 15:07:07 -0700
From: Randy Dunlap <rdunlap@...otime.net>
To: "Rafael J. Wysocki" <rjw@...k.pl>
CC: Stephen Rothwell <sfr@...b.auug.org.au>,
linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: linux-next: Tree for Sept 27 (power/qos.c)
On 09/27/2011 01:05 PM, Rafael J. Wysocki wrote:
> On Tuesday, September 27, 2011, Randy Dunlap wrote:
>> On 09/27/2011 12:35 AM, Stephen Rothwell wrote:
>>> Hi all,
>>
>>
>> When CONFIG_PM_SLEEP is not enabled:
>>
>> drivers/base/power/qos.c:231:29: error: 'struct dev_pm_info' has no member named 'entry'
>
> Thanks for the report.
>
> Below is a patch and it should be fixed in linux-next now.
Acked-by: Randy Dunlap <rdunlap@...otime.net>
Thanks.
> Rafael
>
> ---
> From: Rafael J. Wysocki <rjw@...k.pl>
> Subject: PM / QoS: Fix build issue for CONFIG_PM_SLEEP unset
>
> Commit d41a041b58684710638cbc0d5342a661b50db124 "PM / QoS: Add
> function dev_pm_qos_read_value() (v2)" introduced a build problem
> for CONFIG_PM_SLEEP, because it overlooked this case entirely.
>
> To fix this issue, use the power.power_state in struct device to
> indicate whether or not PM QoS constraints can be applied to the
> device object in question instead of checking the device's
> power.entry field that is valid only for CONFIG_PM_SLEEP set.
>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
> drivers/base/power/main.c | 2 +-
> drivers/base/power/power.h | 10 +++++++++-
> drivers/base/power/qos.c | 11 ++++-------
> include/linux/pm.h | 2 ++
> include/linux/pm_qos.h | 9 +++++++--
> 5 files changed, 23 insertions(+), 11 deletions(-)
>
> Index: linux/drivers/base/power/main.c
> ===================================================================
> --- linux.orig/drivers/base/power/main.c
> +++ linux/drivers/base/power/main.c
> @@ -22,7 +22,6 @@
> #include <linux/mutex.h>
> #include <linux/pm.h>
> #include <linux/pm_runtime.h>
> -#include <linux/pm_qos.h>
> #include <linux/resume-trace.h>
> #include <linux/interrupt.h>
> #include <linux/sched.h>
> @@ -67,6 +66,7 @@ void device_pm_init(struct device *dev)
> spin_lock_init(&dev->power.lock);
> pm_runtime_init(dev);
> INIT_LIST_HEAD(&dev->power.entry);
> + dev->power.power_state = PMSG_INVALID;
> }
>
> /**
> Index: linux/include/linux/pm.h
> ===================================================================
> --- linux.orig/include/linux/pm.h
> +++ linux/include/linux/pm.h
> @@ -326,6 +326,7 @@ extern struct dev_pm_ops generic_subsys_
> * requested by a driver.
> */
>
> +#define PM_EVENT_INVALID (-1)
> #define PM_EVENT_ON 0x0000
> #define PM_EVENT_FREEZE 0x0001
> #define PM_EVENT_SUSPEND 0x0002
> @@ -346,6 +347,7 @@ extern struct dev_pm_ops generic_subsys_
> #define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
> #define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME)
>
> +#define PMSG_INVALID ((struct pm_message){ .event = PM_EVENT_INVALID, })
> #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
> #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
> #define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
> Index: linux/drivers/base/power/power.h
> ===================================================================
> --- linux.orig/drivers/base/power/power.h
> +++ linux/drivers/base/power/power.h
> @@ -1,3 +1,5 @@
> +#include <linux/pm_qos.h>
> +
> #ifdef CONFIG_PM_RUNTIME
>
> extern void pm_runtime_init(struct device *dev);
> @@ -35,15 +37,21 @@ extern void device_pm_move_last(struct d
> static inline void device_pm_init(struct device *dev)
> {
> spin_lock_init(&dev->power.lock);
> + dev->power.power_state = PMSG_INVALID;
> pm_runtime_init(dev);
> }
>
> +static inline void device_pm_add(struct device *dev)
> +{
> + dev_pm_qos_constraints_init(dev);
> +}
> +
> static inline void device_pm_remove(struct device *dev)
> {
> + dev_pm_qos_constraints_destroy(dev);
> pm_runtime_remove(dev);
> }
>
> -static inline void device_pm_add(struct device *dev) {}
> static inline void device_pm_move_before(struct device *deva,
> struct device *devb) {}
> static inline void device_pm_move_after(struct device *deva,
> Index: linux/include/linux/pm_qos.h
> ===================================================================
> --- linux.orig/include/linux/pm_qos.h
> +++ linux/include/linux/pm_qos.h
> @@ -7,6 +7,7 @@
> #include <linux/plist.h>
> #include <linux/notifier.h>
> #include <linux/miscdevice.h>
> +#include <linux/device.h>
>
> #define PM_QOS_RESERVED 0
> #define PM_QOS_CPU_DMA_LATENCY 1
> @@ -142,9 +143,13 @@ static inline int dev_pm_qos_remove_glob
> struct notifier_block *notifier)
> { return 0; }
> static inline void dev_pm_qos_constraints_init(struct device *dev)
> - { return; }
> +{
> + dev->power.power_state = PMSG_ON;
> +}
> static inline void dev_pm_qos_constraints_destroy(struct device *dev)
> - { return; }
> +{
> + dev->power.power_state = PMSG_INVALID;
> +}
> #endif
>
> #endif
> Index: linux/drivers/base/power/qos.c
> ===================================================================
> --- linux.orig/drivers/base/power/qos.c
> +++ linux/drivers/base/power/qos.c
> @@ -149,6 +149,7 @@ void dev_pm_qos_constraints_init(struct
> {
> mutex_lock(&dev_pm_qos_mtx);
> dev->power.constraints = NULL;
> + dev->power.power_state = PMSG_ON;
> mutex_unlock(&dev_pm_qos_mtx);
> }
>
> @@ -165,6 +166,7 @@ void dev_pm_qos_constraints_destroy(stru
>
> mutex_lock(&dev_pm_qos_mtx);
>
> + dev->power.power_state = PMSG_INVALID;
> c = dev->power.constraints;
> if (!c)
> goto out;
> @@ -222,20 +224,15 @@ int dev_pm_qos_add_request(struct device
>
> req->dev = dev;
>
> - device_pm_lock();
> mutex_lock(&dev_pm_qos_mtx);
>
> - if (dev->power.constraints) {
> - device_pm_unlock();
> - } else {
> - if (list_empty(&dev->power.entry)) {
> + if (!dev->power.constraints) {
> + if (dev->power.power_state.event == PM_EVENT_INVALID) {
> /* The device has been removed from the system. */
> - device_pm_unlock();
> req->dev = NULL;
> ret = -ENODEV;
> goto out;
> } else {
> - device_pm_unlock();
> /*
> * Allocate the constraints data on the first call to
> * add_request, i.e. only if the data is not already
> --
--
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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