Re: [PATCH 1/1] usb: cdns3: Put the cdns set active part outside the spin lock
From: wang xiaolei
Date: Thu Jun 15 2023 - 06:15:22 EST
On 6/15/23 8:49 PM, Greg KH wrote:
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On Wed, Jun 14, 2023 at 11:16:05AM +0800, wangxiaolei wrote:
On 5/5/23 6:33 PM, Greg KH wrote:
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On Thu, May 04, 2023 at 09:16:02PM +0800, Xiaolei Wang wrote:
The device may be scheduled during the resume process,
so this cannot appear in atomic operations. Since
pm_runtime_set_active will resume suppliers, put set
active outside the spin lock, which is only used to
protect the struct cdns data structure, otherwise the
kernel will report the following warning:
BUG: sleeping function called from invalid context at drivers/base/power/runtime.c:1163
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 651, name: sh
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
CPU: 0 PID: 651 Comm: sh Tainted: G WC 6.1.20 #1
Hardware name: Freescale i.MX8QM MEK (DT)
Call trace:
dump_backtrace.part.0+0xe0/0xf0
show_stack+0x18/0x30
dump_stack_lvl+0x64/0x80
dump_stack+0x1c/0x38
__might_resched+0x1fc/0x240
__might_sleep+0x68/0xc0
__pm_runtime_resume+0x9c/0xe0
rpm_get_suppliers+0x68/0x1b0
__pm_runtime_set_status+0x298/0x560
cdns_resume+0xb0/0x1c0
cdns3_controller_resume.isra.0+0x1e0/0x250
cdns3_plat_resume+0x28/0x40
Signed-off-by: Xiaolei Wang <xiaolei.wang@xxxxxxxxxxxxx>
---
drivers/usb/cdns3/cdns3-plat.c | 3 ++-
drivers/usb/cdns3/cdnsp-pci.c | 3 ++-
drivers/usb/cdns3/core.c | 14 +++++++++++---
drivers/usb/cdns3/core.h | 3 ++-
4 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
index 2bc5d094548b..726b2e4f67e4 100644
--- a/drivers/usb/cdns3/cdns3-plat.c
+++ b/drivers/usb/cdns3/cdns3-plat.c
@@ -256,9 +256,10 @@ static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
cdns3_set_platform_suspend(cdns->dev, false, false);
spin_lock_irqsave(&cdns->lock, flags);
- cdns_resume(cdns, !PMSG_IS_AUTO(msg));
+ cdns_resume(cdns);
cdns->in_lpm = false;
spin_unlock_irqrestore(&cdns->lock, flags);
+ cdns_set_active(cdns, !PMSG_IS_AUTO(msg));
if (cdns->wakeup_pending) {
cdns->wakeup_pending = false;
enable_irq(cdns->wakeup_irq);
diff --git a/drivers/usb/cdns3/cdnsp-pci.c b/drivers/usb/cdns3/cdnsp-pci.c
index 7b151f5af3cc..0725668ffea4 100644
--- a/drivers/usb/cdns3/cdnsp-pci.c
+++ b/drivers/usb/cdns3/cdnsp-pci.c
@@ -208,8 +208,9 @@ static int __maybe_unused cdnsp_pci_resume(struct device *dev)
int ret;
spin_lock_irqsave(&cdns->lock, flags);
- ret = cdns_resume(cdns, 1);
+ ret = cdns_resume(cdns);
spin_unlock_irqrestore(&cdns->lock, flags);
+ cdns_set_active(cdns, 1);
return ret;
}
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index dbcdf3b24b47..661d5597fb68 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -522,7 +522,7 @@ int cdns_suspend(struct cdns *cdns)
}
EXPORT_SYMBOL_GPL(cdns_suspend);
-int cdns_resume(struct cdns *cdns, u8 set_active)
+int cdns_resume(struct cdns *cdns)
{
struct device *dev = cdns->dev;
enum usb_role real_role;
@@ -556,15 +556,23 @@ int cdns_resume(struct cdns *cdns, u8 set_active)
if (cdns->roles[cdns->role]->resume)
cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cdns_resume);
+
+void cdns_set_active(struct cdns *cdns, u8 set_active)
+{
+ struct device *dev = cdns->dev;
+
if (set_active) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
}
- return 0;
+ return;
}
-EXPORT_SYMBOL_GPL(cdns_resume);
+EXPORT_SYMBOL_GPL(cdns_set_active);
#endif /* CONFIG_PM_SLEEP */
MODULE_AUTHOR("Peter Chen <peter.chen@xxxxxxx>");
diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
index 2d332a788871..0f429042f997 100644
--- a/drivers/usb/cdns3/core.h
+++ b/drivers/usb/cdns3/core.h
@@ -125,8 +125,9 @@ int cdns_init(struct cdns *cdns);
int cdns_remove(struct cdns *cdns);
#ifdef CONFIG_PM_SLEEP
-int cdns_resume(struct cdns *cdns, u8 set_active);
+int cdns_resume(struct cdns *cdns);
int cdns_suspend(struct cdns *cdns);
+void cdns_set_active(struct cdns *cdns, u8 set_active);
#else /* CONFIG_PM_SLEEP */
static inline int cdns_resume(struct cdns *cdns, u8 set_active)
{ return 0; }
--
2.25.1
Hi,
This is the friendly semi-automated patch-bot of Greg Kroah-Hartman.
You have sent him a patch that has triggered this response.
Right now, the development tree you have sent a patch for is "closed"
due to the timing of the merge window. Don't worry, the patch(es) you
have sent are not lost, and will be looked at after the merge window is
over (after the -rc1 kernel is released by Linus).
So thank you for your patience and your patches will be reviewed at this
later time, you do not have to do anything further, this is just a short
note to let you know the patch status and so you don't worry they didn't
make it through.
Can someone help review this patch?
It breaks the build:
drivers/usb/cdns3/core.c: In function ‘cdns_resume’:
drivers/usb/cdns3/core.c:527:24: error: unused variable ‘dev’ [-Werror=unused-variable]
527 | struct device *dev = cdns->dev;
| ^~~
How did you test it?
Oh, sorry, this may be because I did not set the compilation parameters,
which caused me to ignore this warning. I will delete the unused code
and send the v2 version
thanks
xiaolei
thanks,
greg k-h