linux-kernel - Re: [PATCH 1/2] optee: fix tee out of memory failure seen during kexec reboot

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Message-ID: <8d87655f-27c6-6a66-6eb0-9244279fbf2c@linux.microsoft.com>
Date:   Mon, 22 Feb 2021 18:15:08 +0530
From:   Allen Pais <apais@...ux.microsoft.com>
To:     Dhananjay Phadke <dphadke@...ux.microsoft.com>,
        allen.lkml@...il.com, jens.wiklander@...aro.org, zajec5@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 1/2] optee: fix tee out of memory failure seen during
 kexec reboot


> On Wed, 17 Feb 2021 14:57:12 +0530, Allen Pais wrote:
>> -	/*
>> -	 * Ask OP-TEE to free all cached shared memory objects to decrease
>> -	 * reference counters and also avoid wild pointers in secure world
>> -	 * into the old shared memory range.
>> -	 */
>> -	optee_disable_shm_cache(optee);
>> +	if (shutdown) {
>> +		optee_disable_shm_cache(optee);
>> +	} else {
>> +		/*
>> +		 * Ask OP-TEE to free all cached shared memory
>> +		 * objects to decrease reference counters and
>> +		 * also avoid wild pointers in secure world
>> +		 * into the old shared memory range.
>> +		 */
>> +		optee_disable_shm_cache(optee);
>   
> Calling optee_disable_shm_cache() in both if and else. It could be
> put in front of if().
> 

   Ideally, I could just use optee_remove for shutdown() too.
But it would not look good. Hence this approach.

- Allen