linux-kernel - [PATCH v2 0/2] optee: fix OOM seen due to tee_shm

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Message-Id: <20210225090610.242623-1-allen.lkml@gmail.com>
Date:   Thu, 25 Feb 2021 14:36:08 +0530
From:   Allen Pais <allen.lkml@...il.com>
To:     jens.wiklander@...aro.org, zajec5@...il.com
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org,
        Allen Pais <apais@...ux.microsoft.com>
Subject: [PATCH v2 0/2] optee: fix OOM seen due to tee_shm_free()

From: Allen Pais <apais@...ux.microsoft.com>

The following out of memory errors are seen on kexec reboot
from the optee core.
    
[    0.368428] tee_bnxt_fw optee-clnt0: tee_shm_alloc failed
[    0.368461] tee_bnxt_fw: probe of optee-clnt0 failed with error -22
    
tee_shm_release() is not invoked on dma shm buffer.
    
Implement .shutdown() in optee core as well as bnxt firmware driver
to handle the release of the buffers correctly.
    
More info:
https://github.com/OP-TEE/optee_os/issues/3637

v2:
  keep the .shutdown() method simple. [Jens Wiklander]

Allen Pais (2):
  optee: fix tee out of memory failure seen during kexec reboot
  firmware: tee_bnxt: implement shutdown method to handle kexec reboots

 drivers/firmware/broadcom/tee_bnxt_fw.c |  9 +++++++++
 drivers/tee/optee/core.c                | 20 ++++++++++++++++++++
 2 files changed, 29 insertions(+)

-- 
2.25.1