From: Felipe Balbi <balbi@kernel.org>
To: Lu Baolu <baolu.lu@linux.intel.com>,
Baolin Wang <baolin.wang@linaro.org>,
gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
linaro-kernel@lists.linaro.org, broonie@kernel.org
Subject: Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler
Date: Tue, 27 Dec 2016 13:05:56 +0200 [thread overview]
Message-ID: <874m1p3a3v.fsf@linux.intel.com> (raw)
In-Reply-To: <5861D477.7070407@linux.intel.com>
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Hi,
Lu Baolu <baolu.lu@linux.intel.com> writes:
> On 12/26/2016 04:01 PM, Baolin Wang wrote:
>> On some platfroms(like x86 platform), when one core is running the USB gadget
>> irq thread handler by dwc3_thread_interrupt(), meanwhile another core also can
>> respond other interrupts from dwc3 controller and modify the event buffer by
>> dwc3_interrupt() function, that will cause getting the wrong event count in
>> irq thread handler to make the USB function abnormal.
>>
>> We should add spin_lock/unlock() in dwc3_check_event_buf() to avoid this race.
>
> Why not spin_lock_irq ones? This lock seems to be used in both
> normal and interrupt threads. Or, I missed anything?
this is top half handler. Interrupts are already disabled.
--
balbi
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next prev parent reply other threads:[~2016-12-27 11:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-26 8:01 [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Baolin Wang
2016-12-27 2:39 ` Lu Baolu
2016-12-27 2:58 ` Baolin Wang
2016-12-27 4:45 ` Lu Baolu
2016-12-27 11:05 ` Felipe Balbi [this message]
2016-12-28 15:27 ` Janusz Dziedzic
2016-12-28 16:19 ` Felipe Balbi
2016-12-29 1:29 ` John Youn
2017-01-05 19:08 ` John Youn
2017-01-06 2:44 ` Baolin Wang
2016-12-27 10:52 ` Janusz Dziedzic
2016-12-27 11:06 ` Baolin Wang
2016-12-27 11:11 ` Felipe Balbi
2016-12-27 12:16 ` Baolin Wang
2016-12-28 12:30 ` Janusz Dziedzic
2017-01-03 12:21 ` Baolin Wang
2017-01-03 12:33 ` Felipe Balbi
2017-01-05 2:07 ` Baolin Wang
2017-01-05 9:26 ` Felipe Balbi
2017-01-05 9:43 ` Baolin Wang
2017-01-05 11:19 ` Felipe Balbi
2017-01-05 12:03 ` Baolin Wang
2016-12-27 11:07 ` Felipe Balbi
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