From: Allen Pais <apais@linux.microsoft.com>
To: Jens Wiklander <jens.wiklander@linaro.org>
Cc: Dhananjay Phadke <dphadke@linux.microsoft.com>,
allen.lkml@gmail.com, zajec5@gmail.com,
linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org,
op-tee@lists.trustedfirmware.org,
linux-arm-kernel@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com
Subject: Re: [PATCH 1/2] optee: fix tee out of memory failure seen during kexec reboot
Date: Wed, 24 Feb 2021 22:23:34 +0530 [thread overview]
Message-ID: <9f4b44c1-cf86-a061-a9c6-726c4e23f99b@linux.microsoft.com> (raw)
In-Reply-To: <20210224081553.GB2653493@jade>
>>>>>> - /*
>>>>>> - * 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.
>>>
>>> What is the problem with using optee_remove() for shutdown()?
>>>
>>
>> There is no problem, I just thought it would be more cleaner/readable
>> with this approach. If you'd like to keep it simple by just calling
>> optee_remove() for shutdown() too, I could quickly send out V2.
>
> In the patch you posted it looks like you'd like to call
> only optee_disable_shm_cache() in the case of shutdown. Like:
>
> static void optee_shutdown(struct platform_device *pdev)
> {
> optee_disable_shm_cache(platform_get_drvdata(pdev));
> }
>
> and optee_remove() kept as it was before this patch.
>
Sure, Will have it fixed and send out V2.
Thanks.
next prev parent reply other threads:[~2021-02-24 16:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 9:27 [PATCH 0/2] optee: fix OOM seen due to tee_shm_free() Allen Pais
2021-02-17 9:27 ` [PATCH 1/2] optee: fix tee out of memory failure seen during kexec reboot Allen Pais
2021-02-18 20:03 ` Dhananjay Phadke
2021-02-22 12:45 ` Allen Pais
2021-02-23 8:19 ` Jens Wiklander
2021-02-23 16:26 ` Allen Pais
2021-02-24 8:15 ` Jens Wiklander
2021-02-24 16:53 ` Allen Pais [this message]
2021-02-17 9:27 ` [PATCH 2/2] firmware: tee_bnxt: implement shutdown method to handle kexec reboots Allen Pais
2021-02-18 18:12 ` [PATCH 0/2] optee: fix OOM seen due to tee_shm_free() Dhananjay Phadke
2021-02-23 6:17 ` Allen Pais
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