linux-kernel - Re: [PATCH] xhci: Keep interrupt disabled in initialization until host is running.

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Date:   Fri, 22 Sep 2023 16:03:26 +0530
From:   Prashanth K <quic_prashk@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, Hongyu Xie <xy521521@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>, <stable@...nel.org>,
        Hongyu Xie <xiehongyu1@...inos.cn>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH] xhci: Keep interrupt disabled in initialization until
 host is running.



On 22-09-23 04:00 pm, Greg Kroah-Hartman wrote:
> On Fri, Sep 22, 2023 at 02:51:41PM +0530, Prashanth K wrote:
>> From: Hongyu Xie <xy521521@...il.com>
>>
>> [ Upstream commit 808925075fb750804a60ff0710614466c396db4 ]
>>
>> irq is disabled in xhci_quiesce(called by xhci_halt, with bit:2 cleared
>> in USBCMD register), but xhci_run(called by usb_add_hcd) re-enable it.
>> It's possible that you will receive thousands of interrupt requests
>> after initialization for 2.0 roothub. And you will get a lot of
>> warning like, "xHCI dying, ignoring interrupt. Shouldn't IRQs be
>> disabled?". This amount of interrupt requests will cause the entire
>> system to freeze.
>> This problem was first found on a device with ASM2142 host controller
>> on it.
>>
>> [tidy up old code while moving it, reword header -Mathias]
>>
>> Cc: stable@...nel.org
>> Signed-off-by: Hongyu Xie <xiehongyu1@...inos.cn>
>> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>> Link: https://lore.kernel.org/r/20220623111945.1557702-2-mathias.nyman@linux.intel.com
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> ---
>>   drivers/usb/host/xhci.c | 34 +++++++++++++++++++++-------------
>>   1 file changed, 21 insertions(+), 13 deletions(-)
> 
> What stable kernel(s) are you asking this to be applied to?
> 
> greg k-h
Need this patch on v5.15, I had cc'ed "stable@...nel.org # 5.15", but 
looks like it didn't work. Should I resend this with SOB and CC tags?

Thanks,
Prashanth K