This is a note to let you know that I've just added the patch titled
USB: ehci: fix an interrupt calltrace error
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 643a4df7fe3f6831d14536fd692be85f92670a52 Mon Sep 17 00:00:00 2001
From: Longfang Liu liulongfang@huawei.com Date: Tue, 12 Jan 2021 09:57:27 +0800 Subject: USB: ehci: fix an interrupt calltrace error
The system that use Synopsys USB host controllers goes to suspend when using USB audio player. This causes the USB host controller continuous send interrupt signal to system, When the number of interrupts exceeds 100000, the system will forcibly close the interrupts and output a calltrace error.
When the system goes to suspend, the last interrupt is reported to the driver. At this time, the system has set the state to suspend. This causes the last interrupt to not be processed by the system and not clear the interrupt flag. This uncleared interrupt flag constantly triggers new interrupt event. This causing the driver to receive more than 100,000 interrupts, which causes the system to forcibly close the interrupt report and report the calltrace error.
so, when the driver goes to sleep and changes the system state to suspend, the interrupt flag needs to be cleared.
Signed-off-by: Longfang Liu liulongfang@huawei.com Acked-by: Alan Stern stern@rowland.harvard.edu Link: https://lore.kernel.org/r/1610416647-45774-1-git-send-email-liulongfang@huaw... Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/ehci-hub.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 087402aec5cb..9f9ab5ccea88 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -345,6 +345,9 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
unlink_empty_async_suspended(ehci);
+ /* Some Synopsys controllers mistakenly leave IAA turned on */ + ehci_writel(ehci, STS_IAA, &ehci->regs->status); + /* Any IAA cycle that started before the suspend is now invalid */ end_iaa_cycle(ehci); ehci_handle_start_intr_unlinks(ehci);