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From: Arun Kumar Neelakantam <aneela@codeaurora.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: ohad@wizery.com, bjorn.andersson@linaro.org, clew@codeaurora.org,
	sricharan@codeaurora.org, linux-remoteproc@vger.kernel.org,
	linux-kernel@vger.kernel.org, Andy Gross <agross@kernel.org>,
	"open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@vger.kernel.org>
Subject: Re: [PATCH V5 5/5] rpmsg: glink: unregister rpmsg device during endpoint destroy
Date: Wed, 20 May 2020 15:02:29 +0530	[thread overview]
Message-ID: <be35a111-87cc-7d5e-fd74-8653175f8a09@codeaurora.org> (raw)
In-Reply-To: <20200513221342.GC8328@xps15>


On 5/14/2020 3:43 AM, Mathieu Poirier wrote:
> On Wed, May 13, 2020 at 10:40:06AM +0530, Arun Kumar Neelakantam wrote:
>> Rpmsg device unregister is not happening if channel close is triggered
>> from local side and causing re-registration of device failures.
>>
>> Unregister rpmsg device for local close in endpoint destroy path.
>>
>> Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
>> ---
>>   drivers/rpmsg/qcom_glink_native.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
>> index 0e8a28c0..fc8ef66 100644
>> --- a/drivers/rpmsg/qcom_glink_native.c
>> +++ b/drivers/rpmsg/qcom_glink_native.c
>> @@ -1207,6 +1207,7 @@ static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
>>   {
>>   	struct glink_channel *channel = to_glink_channel(ept);
>>   	struct qcom_glink *glink = channel->glink;
>> +	struct rpmsg_channel_info chinfo;
>>   	unsigned long flags;
>>   
>>   	spin_lock_irqsave(&channel->recv_lock, flags);
>> @@ -1214,6 +1215,13 @@ static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
>>   	spin_unlock_irqrestore(&channel->recv_lock, flags);
>>   
>>   	/* Decouple the potential rpdev from the channel */
>> +	if (channel->rpdev) {
> If we proceed this way no other channel can have an rpdev.  I would hope that
> unregistration of rpdev would be more symetrical to what is done in patch 03.
>
> Thanks,
> Mathieu
Unregister here also required along with in qcom_glink_rx_close() 
otherwise if the remote open the channel again it map to stale rpmsg 
device.
>
>> +		strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
>> +		chinfo.src = RPMSG_ADDR_ANY;
>> +		chinfo.dst = RPMSG_ADDR_ANY;
>> +
>> +		rpmsg_unregister_device(glink->dev, &chinfo);
>> +	}
>>   	channel->rpdev = NULL;
>>   
>>   	qcom_glink_send_close_req(glink, channel);
>> @@ -1477,6 +1485,7 @@ static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
>>   
>>   		rpmsg_unregister_device(glink->dev, &chinfo);
>>   	}
>> +	channel->rpdev = NULL;
>>   
>>   	qcom_glink_send_close_ack(glink, channel->rcid);
>>   
>> -- 
>> 2.7.4

  reply	other threads:[~2020-05-20  9:32 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-13  5:10 [PATCH V5 0/5] Add chrdev and name query support for GLINK Arun Kumar Neelakantam
2020-05-13  5:10 ` [PATCH V5 1/5] rpmsg: glink: Use complete_all for open states Arun Kumar Neelakantam
2020-05-13 20:59   ` Mathieu Poirier
2020-05-20  9:28     ` Arun Kumar Neelakantam
2020-05-13  5:10 ` [PATCH V5 2/5] rpmsg: Guard against null endpoint ops in destroy Arun Kumar Neelakantam
2020-05-13  5:10 ` [PATCH V5 3/5] rpmsg: glink: Add support for rpmsg glink chrdev Arun Kumar Neelakantam
2020-05-13 21:56   ` Mathieu Poirier
2020-05-13  5:10 ` [PATCH V5 4/5] rpmsg: glink: Expose rpmsg name attr for glink Arun Kumar Neelakantam
2020-05-13  5:10 ` [PATCH V5 5/5] rpmsg: glink: unregister rpmsg device during endpoint destroy Arun Kumar Neelakantam
2020-05-13 22:13   ` Mathieu Poirier
2020-05-20  9:32     ` Arun Kumar Neelakantam [this message]
     [not found] <1574417087-27594-1-git-send-email-aneela@codeaurora.org>
2019-11-22 10:05 ` Arun Kumar Neelakantam
2019-11-22 10:05   ` Arun Kumar Neelakantam
2019-11-22 10:05 ` Arun Kumar Neelakantam

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