drivers/rtc/rtc-sirfsoc.c: fix kernel warning during wakeup
enable_irq_wake() might fail, if so, we will see kernel warning in resume
entries due to it always calls disable_irq_wake().
WARNING: at kernel/irq/manage.c:529 irq_set_irq_wake+0xc4/0xf0()
Unbalanced IRQ 52 wake disable
Modules linked in: ipv6 libcomposite configfs
CPU: 0 PID: 1591 Comm: ash Tainted: G W 3.10.0-00854-gdbd86d4-dirty #100
(unwind_backtrace+0x0/0xf8) from (show_stack+0x10/0x14)
(show_stack+0x10/0x14) from (warn_slowpath_common+0x54/0x68)
(warn_slowpath_common+0x54/0x68) from (warn_slowpath_fmt+0x30/0x40)
(warn_slowpath_fmt+0x30/0x40) from (irq_set_irq_wake+0xc4/0xf0)
(irq_set_irq_wake+0xc4/0xf0) from (sirfsoc_rtc_restore+0x30/0x38)
(sirfsoc_rtc_restore+0x30/0x38) from (platform_pm_restore+0x2c/0x50)
(platform_pm_restore+0x2c/0x50) from (dpm_run_callback.clone.6+0x30/0xb0)
(dpm_run_callback.clone.6+0x30/0xb0) from (device_resume+0x88/0x134)
(device_resume+0x88/0x134) from (dpm_resume+0x114/0x230)
(dpm_resume+0x114/0x230) from (hibernation_snapshot+0x178/0x1d0)
(hibernation_snapshot+0x178/0x1d0) from (hibernate+0x130/0x1dc)
(hibernate+0x130/0x1dc) from (state_store+0xb4/0xc0)
(state_store+0xb4/0xc0) from (kobj_attr_store+0x14/0x20)
(kobj_attr_store+0x14/0x20) from (sysfs_write_file+0xfc/0x17c)
(sysfs_write_file+0xfc/0x17c) from (vfs_write+0xc8/0x194)
(vfs_write+0xc8/0x194) from (SyS_write+0x40/0x6c)
(SyS_write+0x40/0x6c) from (ret_fast_syscall+0x0/0x30)
To avoid unbalanced "IRQ wake disable", ensure that disable_irq_wake() is
called only when enable_irq_wake() have been successfully enabled.
Signed-off-by: Xianglong Du <Xianglong.Du@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/rtc-sirfsoc.c b/drivers/rtc/rtc-sirfsoc.c
index aa7ed4b..63460cf 100644
--- a/drivers/rtc/rtc-sirfsoc.c
+++ b/drivers/rtc/rtc-sirfsoc.c
@@ -44,6 +44,7 @@
struct rtc_device *rtc;
u32 rtc_base;
u32 irq;
+ unsigned irq_wake;
/* Overflow for every 8 years extra time */
u32 overflow_rtc;
#ifdef CONFIG_PM
@@ -355,8 +356,8 @@
rtcdrv->saved_counter =
sirfsoc_rtc_iobrg_readl(rtcdrv->rtc_base + RTC_CN);
rtcdrv->saved_overflow_rtc = rtcdrv->overflow_rtc;
- if (device_may_wakeup(&pdev->dev))
- enable_irq_wake(rtcdrv->irq);
+ if (device_may_wakeup(&pdev->dev) && !enable_irq_wake(rtcdrv->irq))
+ rtcdrv->irq_wake = 1;
return 0;
}
@@ -423,8 +424,10 @@
struct platform_device *pdev = to_platform_device(dev);
struct sirfsoc_rtc_drv *rtcdrv = platform_get_drvdata(pdev);
sirfsoc_rtc_thaw(dev);
- if (device_may_wakeup(&pdev->dev))
+ if (device_may_wakeup(&pdev->dev) && rtcdrv->irq_wake) {
disable_irq_wake(rtcdrv->irq);
+ rtcdrv->irq_wake = 0;
+ }
return 0;
}
@@ -434,8 +437,10 @@
struct platform_device *pdev = to_platform_device(dev);
struct sirfsoc_rtc_drv *rtcdrv = platform_get_drvdata(pdev);
- if (device_may_wakeup(&pdev->dev))
+ if (device_may_wakeup(&pdev->dev) && rtcdrv->irq_wake) {
disable_irq_wake(rtcdrv->irq);
+ rtcdrv->irq_wake = 0;
+ }
return 0;
}