linux-kernel - Re: [PATCH 11/17] remoteproc/omap: Check for undefined mailbox messages

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Message-ID: <a66c1ed4-5a97-22bf-e58c-4a458b3104cd@ti.com>
Date:   Tue, 12 Nov 2019 10:38:47 +0200
From:   Tero Kristo <t-kristo@...com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     <ohad@...ery.com>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <s-anna@...com>
Subject: Re: [PATCH 11/17] remoteproc/omap: Check for undefined mailbox
 messages

On 12/11/2019 01:39, Bjorn Andersson wrote:
> On Mon 28 Oct 05:42 PDT 2019, Tero Kristo wrote:
> 
>> From: Suman Anna <s-anna@...com>
>>
>> Add some checks in the mailbox callback function to limit
>> any processing in the mailbox callback function to only
>> certain currently valid messages, and drop all the remaining
>> messages. A debug message is added to print any such invalid
>> messages when the appropriate trace control is enabled.
>>
>> Signed-off-by: Subramaniam Chanderashekarapuram <subramaniam.ca@...com>
>> Signed-off-by: Suman Anna <s-anna@...com>
> 
> This should either have a "Co-developed-by" or Suman should be the first
> one.

Let me swap that.

-Tero

> 
>> Signed-off-by: Tero Kristo <t-kristo@...com>
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Regards,
> Bjorn
> 
>> ---
>>   drivers/remoteproc/omap_remoteproc.c | 6 ++++++
>>   drivers/remoteproc/omap_remoteproc.h | 7 +++++++
>>   2 files changed, 13 insertions(+)
>>
>> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
>> index e46bb4c790d7..016d5beda195 100644
>> --- a/drivers/remoteproc/omap_remoteproc.c
>> +++ b/drivers/remoteproc/omap_remoteproc.c
>> @@ -124,6 +124,12 @@ static void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
>>   		dev_info(dev, "received echo reply from %s\n", name);
>>   		break;
>>   	default:
>> +		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
>> +			return;
>> +		if (msg > oproc->rproc->max_notifyid) {
>> +			dev_dbg(dev, "dropping unknown message 0x%x", msg);
>> +			return;
>> +		}
>>   		/* msg contains the index of the triggered vring */
>>   		if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
>>   			dev_dbg(dev, "no message was found in vqid %d\n", msg);
>> diff --git a/drivers/remoteproc/omap_remoteproc.h b/drivers/remoteproc/omap_remoteproc.h
>> index 1e6fef753c4f..18f522617683 100644
>> --- a/drivers/remoteproc/omap_remoteproc.h
>> +++ b/drivers/remoteproc/omap_remoteproc.h
>> @@ -31,6 +31,12 @@
>>    *
>>    * @RP_MBOX_ABORT_REQUEST: a "please crash" request, used for testing the
>>    * recovery mechanism (to some extent).
>> + *
>> + * Introduce new message definitions if any here.
>> + *
>> + * @RP_MBOX_END_MSG: Indicates end of known/defined messages from remote core
>> + * This should be the last definition.
>> + *
>>    */
>>   enum omap_rp_mbox_messages {
>>   	RP_MBOX_READY		= 0xFFFFFF00,
>> @@ -39,6 +45,7 @@ enum omap_rp_mbox_messages {
>>   	RP_MBOX_ECHO_REQUEST	= 0xFFFFFF03,
>>   	RP_MBOX_ECHO_REPLY	= 0xFFFFFF04,
>>   	RP_MBOX_ABORT_REQUEST	= 0xFFFFFF05,
>> +	RP_MBOX_END_MSG		= 0xFFFFFF06,
>>   };
>>   
>>   #endif /* _OMAP_RPMSG_H */
>> -- 
>> 2.17.1
>>
>> --

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