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Date: Thu, 18 Aug 2011 22:52:10 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Alan Stern <stern@...land.harvard.edu>
Cc: Greg KH <greg@...ah.com>,
"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
USB list <linux-usb@...r.kernel.org>, netdev@...r.kernel.org,
linux-bluetooth@...r.kernel.org, linux-input@...r.kernel.org,
Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH] PM: add macro to test for runtime PM events
Hi,
On Thursday, August 18, 2011, Alan Stern wrote:
> This patch (as1482) adds a macro for testing whether or not a
> pm_message value represents an autosuspend or autoresume (i.e., a
> runtime PM) event. Encapsulating this notion seems preferable to
> open-coding the test all over the place.
>
> Signed-off-by: Alan Stern <stern@...land.harvard.edu>
>
> ---
>
> This is a minor change in the PM API, but most of the affected files
> are in the USB subsystem. Therefore either Rafael or Greg might prefer
> to accept this patch.
I can take the patch if Greg is fine with that.
Thanks,
Rafael
> Documentation/usb/power-management.txt | 8 ++++----
> drivers/bluetooth/btusb.c | 2 +-
> drivers/hid/hid-picolcd.c | 2 +-
> drivers/hid/usbhid/hid-core.c | 7 +++----
> drivers/net/usb/usbnet.c | 2 +-
> drivers/net/wimax/i2400m/usb.c | 4 ++--
> drivers/usb/class/cdc-acm.c | 2 +-
> drivers/usb/class/cdc-wdm.c | 6 +++---
> drivers/usb/core/driver.c | 9 ++++-----
> drivers/usb/core/hcd.c | 4 ++--
> drivers/usb/core/hub.c | 10 +++++-----
> drivers/usb/serial/sierra.c | 2 +-
> drivers/usb/serial/usb_wwan.c | 2 +-
> include/linux/pm.h | 2 ++
> sound/usb/card.c | 2 +-
> 15 files changed, 32 insertions(+), 32 deletions(-)
>
> Index: usb-3.1/include/linux/pm.h
> ===================================================================
> --- usb-3.1.orig/include/linux/pm.h
> +++ usb-3.1/include/linux/pm.h
> @@ -366,6 +366,8 @@ extern struct dev_pm_ops generic_subsys_
> #define PMSG_AUTO_RESUME ((struct pm_message) \
> { .event = PM_EVENT_AUTO_RESUME, })
>
> +#define PMSG_IS_AUTO(msg) (((msg).event & PM_EVENT_AUTO) != 0)
> +
> /**
> * Device run-time power management status.
> *
> Index: usb-3.1/Documentation/usb/power-management.txt
> ===================================================================
> --- usb-3.1.orig/Documentation/usb/power-management.txt
> +++ usb-3.1/Documentation/usb/power-management.txt
> @@ -439,10 +439,10 @@ cause autosuspends to fail with -EBUSY i
> device.
>
> External suspend calls should never be allowed to fail in this way,
> -only autosuspend calls. The driver can tell them apart by checking
> -the PM_EVENT_AUTO bit in the message.event argument to the suspend
> -method; this bit will be set for internal PM events (autosuspend) and
> -clear for external PM events.
> +only autosuspend calls. The driver can tell them apart by applying
> +the PMSG_IS_AUTO() macro to the message argument to the suspend
> +method; it will return True for internal PM events (autosuspend) and
> +False for external PM events.
>
>
> Mutual exclusion
> Index: usb-3.1/drivers/net/usb/usbnet.c
> ===================================================================
> --- usb-3.1.orig/drivers/net/usb/usbnet.c
> +++ usb-3.1/drivers/net/usb/usbnet.c
> @@ -1470,7 +1470,7 @@ int usbnet_suspend (struct usb_interface
> if (!dev->suspend_count++) {
> spin_lock_irq(&dev->txq.lock);
> /* don't autosuspend while transmitting */
> - if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
> + if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
> spin_unlock_irq(&dev->txq.lock);
> return -EBUSY;
> } else {
> Index: usb-3.1/drivers/net/wimax/i2400m/usb.c
> ===================================================================
> --- usb-3.1.orig/drivers/net/wimax/i2400m/usb.c
> +++ usb-3.1/drivers/net/wimax/i2400m/usb.c
> @@ -599,7 +599,7 @@ void i2400mu_disconnect(struct usb_inter
> *
> * As well, the device might refuse going to sleep for whichever
> * reason. In this case we just fail. For system suspend/hibernate,
> - * we *can't* fail. We check PM_EVENT_AUTO to see if the
> + * we *can't* fail. We check PMSG_IS_AUTO to see if the
> * suspend call comes from the USB stack or from the system and act
> * in consequence.
> *
> @@ -615,7 +615,7 @@ int i2400mu_suspend(struct usb_interface
> struct i2400m *i2400m = &i2400mu->i2400m;
>
> #ifdef CONFIG_PM
> - if (pm_msg.event & PM_EVENT_AUTO)
> + if (PMSG_IS_AUTO(pm_msg))
> is_autosuspend = 1;
> #endif
>
> Index: usb-3.1/sound/usb/card.c
> ===================================================================
> --- usb-3.1.orig/sound/usb/card.c
> +++ usb-3.1/sound/usb/card.c
> @@ -628,7 +628,7 @@ static int usb_audio_suspend(struct usb_
> if (chip == (void *)-1L)
> return 0;
>
> - if (!(message.event & PM_EVENT_AUTO)) {
> + if (!PMSG_IS_AUTO(message)) {
> snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
> if (!chip->num_suspended_intf++) {
> list_for_each(p, &chip->pcm_list) {
> Index: usb-3.1/drivers/bluetooth/btusb.c
> ===================================================================
> --- usb-3.1.orig/drivers/bluetooth/btusb.c
> +++ usb-3.1/drivers/bluetooth/btusb.c
> @@ -1103,7 +1103,7 @@ static int btusb_suspend(struct usb_inte
> return 0;
>
> spin_lock_irq(&data->txlock);
> - if (!((message.event & PM_EVENT_AUTO) && data->tx_in_flight)) {
> + if (!(PMSG_IS_AUTO(message) && data->tx_in_flight)) {
> set_bit(BTUSB_SUSPENDING, &data->flags);
> spin_unlock_irq(&data->txlock);
> } else {
> Index: usb-3.1/drivers/hid/hid-picolcd.c
> ===================================================================
> --- usb-3.1.orig/drivers/hid/hid-picolcd.c
> +++ usb-3.1/drivers/hid/hid-picolcd.c
> @@ -2409,7 +2409,7 @@ static int picolcd_raw_event(struct hid_
> #ifdef CONFIG_PM
> static int picolcd_suspend(struct hid_device *hdev, pm_message_t message)
> {
> - if (message.event & PM_EVENT_AUTO)
> + if (PMSG_IS_AUTO(message))
> return 0;
>
> picolcd_suspend_backlight(hid_get_drvdata(hdev));
> Index: usb-3.1/drivers/hid/usbhid/hid-core.c
> ===================================================================
> --- usb-3.1.orig/drivers/hid/usbhid/hid-core.c
> +++ usb-3.1/drivers/hid/usbhid/hid-core.c
> @@ -1332,7 +1332,7 @@ static int hid_suspend(struct usb_interf
> struct usbhid_device *usbhid = hid->driver_data;
> int status;
>
> - if (message.event & PM_EVENT_AUTO) {
> + if (PMSG_IS_AUTO(message)) {
> spin_lock_irq(&usbhid->lock); /* Sync with error handler */
> if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
> && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
> @@ -1367,7 +1367,7 @@ static int hid_suspend(struct usb_interf
> return -EIO;
> }
>
> - if (!ignoreled && (message.event & PM_EVENT_AUTO)) {
> + if (!ignoreled && PMSG_IS_AUTO(message)) {
> spin_lock_irq(&usbhid->lock);
> if (test_bit(HID_LED_ON, &usbhid->iofl)) {
> spin_unlock_irq(&usbhid->lock);
> @@ -1380,8 +1380,7 @@ static int hid_suspend(struct usb_interf
> hid_cancel_delayed_stuff(usbhid);
> hid_cease_io(usbhid);
>
> - if ((message.event & PM_EVENT_AUTO) &&
> - test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
> + if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
> /* lost race against keypresses */
> status = hid_start_in(hid);
> if (status < 0)
> Index: usb-3.1/drivers/usb/class/cdc-acm.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/class/cdc-acm.c
> +++ usb-3.1/drivers/usb/class/cdc-acm.c
> @@ -1305,7 +1305,7 @@ static int acm_suspend(struct usb_interf
> struct acm *acm = usb_get_intfdata(intf);
> int cnt;
>
> - if (message.event & PM_EVENT_AUTO) {
> + if (PMSG_IS_AUTO(message)) {
> int b;
>
> spin_lock_irq(&acm->write_lock);
> Index: usb-3.1/drivers/usb/class/cdc-wdm.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/class/cdc-wdm.c
> +++ usb-3.1/drivers/usb/class/cdc-wdm.c
> @@ -798,11 +798,11 @@ static int wdm_suspend(struct usb_interf
> dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
>
> /* if this is an autosuspend the caller does the locking */
> - if (!(message.event & PM_EVENT_AUTO))
> + if (!PMSG_IS_AUTO(message))
> mutex_lock(&desc->lock);
> spin_lock_irq(&desc->iuspin);
>
> - if ((message.event & PM_EVENT_AUTO) &&
> + if (PMSG_IS_AUTO(message) &&
> (test_bit(WDM_IN_USE, &desc->flags)
> || test_bit(WDM_RESPONDING, &desc->flags))) {
> spin_unlock_irq(&desc->iuspin);
> @@ -815,7 +815,7 @@ static int wdm_suspend(struct usb_interf
> kill_urbs(desc);
> cancel_work_sync(&desc->rxwork);
> }
> - if (!(message.event & PM_EVENT_AUTO))
> + if (!PMSG_IS_AUTO(message))
> mutex_unlock(&desc->lock);
>
> return rv;
> Index: usb-3.1/drivers/usb/core/driver.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/core/driver.c
> +++ usb-3.1/drivers/usb/core/driver.c
> @@ -1046,8 +1046,7 @@ static int usb_resume_device(struct usb_
> /* Non-root devices on a full/low-speed bus must wait for their
> * companion high-speed root hub, in case a handoff is needed.
> */
> - if (!(msg.event & PM_EVENT_AUTO) && udev->parent &&
> - udev->bus->hs_companion)
> + if (!PMSG_IS_AUTO(msg) && udev->parent && udev->bus->hs_companion)
> device_pm_wait_for_dev(&udev->dev,
> &udev->bus->hs_companion->root_hub->dev);
>
> @@ -1075,7 +1074,7 @@ static int usb_suspend_interface(struct
>
> if (driver->suspend) {
> status = driver->suspend(intf, msg);
> - if (status && !(msg.event & PM_EVENT_AUTO))
> + if (status && !PMSG_IS_AUTO(msg))
> dev_err(&intf->dev, "%s error %d\n",
> "suspend", status);
> } else {
> @@ -1189,7 +1188,7 @@ static int usb_suspend_both(struct usb_d
> status = usb_suspend_interface(udev, intf, msg);
>
> /* Ignore errors during system sleep transitions */
> - if (!(msg.event & PM_EVENT_AUTO))
> + if (!PMSG_IS_AUTO(msg))
> status = 0;
> if (status != 0)
> break;
> @@ -1199,7 +1198,7 @@ static int usb_suspend_both(struct usb_d
> status = usb_suspend_device(udev, msg);
>
> /* Again, ignore errors during system sleep transitions */
> - if (!(msg.event & PM_EVENT_AUTO))
> + if (!PMSG_IS_AUTO(msg))
> status = 0;
> }
>
> Index: usb-3.1/drivers/usb/core/hcd.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/core/hcd.c
> +++ usb-3.1/drivers/usb/core/hcd.c
> @@ -1960,7 +1960,7 @@ int hcd_bus_suspend(struct usb_device *r
> int old_state = hcd->state;
>
> dev_dbg(&rhdev->dev, "bus %s%s\n",
> - (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
> + (PMSG_IS_AUTO(msg) ? "auto-" : ""), "suspend");
> if (HCD_DEAD(hcd)) {
> dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
> return 0;
> @@ -1996,7 +1996,7 @@ int hcd_bus_resume(struct usb_device *rh
> int old_state = hcd->state;
>
> dev_dbg(&rhdev->dev, "usb %s%s\n",
> - (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
> + (PMSG_IS_AUTO(msg) ? "auto-" : ""), "resume");
> if (HCD_DEAD(hcd)) {
> dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
> return 0;
> Index: usb-3.1/drivers/usb/core/hub.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/core/hub.c
> +++ usb-3.1/drivers/usb/core/hub.c
> @@ -2342,7 +2342,7 @@ int usb_port_suspend(struct usb_device *
> dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
> status);
> /* bail if autosuspend is requested */
> - if (msg.event & PM_EVENT_AUTO)
> + if (PMSG_IS_AUTO(msg))
> return status;
> }
> }
> @@ -2367,12 +2367,12 @@ int usb_port_suspend(struct usb_device *
> USB_CTRL_SET_TIMEOUT);
>
> /* System sleep transitions should never fail */
> - if (!(msg.event & PM_EVENT_AUTO))
> + if (!PMSG_IS_AUTO(msg))
> status = 0;
> } else {
> /* device has up to 10 msec to fully suspend */
> dev_dbg(&udev->dev, "usb %ssuspend\n",
> - (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
> + (PMSG_IS_AUTO(msg) ? "auto-" : ""));
> usb_set_device_state(udev, USB_STATE_SUSPENDED);
> msleep(10);
> }
> @@ -2523,7 +2523,7 @@ int usb_port_resume(struct usb_device *u
> } else {
> /* drive resume for at least 20 msec */
> dev_dbg(&udev->dev, "usb %sresume\n",
> - (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
> + (PMSG_IS_AUTO(msg) ? "auto-" : ""));
> msleep(25);
>
> /* Virtual root hubs can trigger on GET_PORT_STATUS to
> @@ -2625,7 +2625,7 @@ static int hub_suspend(struct usb_interf
> udev = hdev->children [port1-1];
> if (udev && udev->can_submit) {
> dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
> - if (msg.event & PM_EVENT_AUTO)
> + if (PMSG_IS_AUTO(msg))
> return -EBUSY;
> }
> }
> Index: usb-3.1/drivers/usb/serial/sierra.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/serial/sierra.c
> +++ usb-3.1/drivers/usb/serial/sierra.c
> @@ -1009,7 +1009,7 @@ static int sierra_suspend(struct usb_ser
> struct sierra_intf_private *intfdata;
> int b;
>
> - if (message.event & PM_EVENT_AUTO) {
> + if (PMSG_IS_AUTO(message)) {
> intfdata = serial->private;
> spin_lock_irq(&intfdata->susp_lock);
> b = intfdata->in_flight;
> Index: usb-3.1/drivers/usb/serial/usb_wwan.c
> ===================================================================
> --- usb-3.1.orig/drivers/usb/serial/usb_wwan.c
> +++ usb-3.1/drivers/usb/serial/usb_wwan.c
> @@ -651,7 +651,7 @@ int usb_wwan_suspend(struct usb_serial *
>
> dbg("%s entered", __func__);
>
> - if (message.event & PM_EVENT_AUTO) {
> + if (PMSG_IS_AUTO(message)) {
> spin_lock_irq(&intfdata->susp_lock);
> b = intfdata->in_flight;
> spin_unlock_irq(&intfdata->susp_lock);
>
>
>
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