Tyler Hicks adf752af45 optee: Refuse to load the driver under the kdump kernel ... Fix a hung task issue, seen when booting the kdump kernel, that is caused by all of the secure world threads being in a permanent suspended state: INFO: task swapper/0:1 blocked for more than 120 seconds. Not tainted 5.4.83 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. swapper/0 D 0 1 0 0x00000028 Call trace: __switch_to+0xc8/0x118 __schedule+0x2e0/0x700 schedule+0x38/0xb8 schedule_timeout+0x258/0x388 wait_for_completion+0x16c/0x4b8 optee_cq_wait_for_completion+0x28/0xa8 optee_disable_shm_cache+0xb8/0xf8 optee_probe+0x560/0x61c platform_drv_probe+0x58/0xa8 really_probe+0xe0/0x338 driver_probe_device+0x5c/0xf0 device_driver_attach+0x74/0x80 __driver_attach+0x64/0xe0 bus_for_each_dev+0x84/0xd8 driver_attach+0x30/0x40 bus_add_driver+0x188/0x1e8 driver_register+0x64/0x110 __platform_driver_register+0x54/0x60 optee_driver_init+0x20/0x28 do_one_initcall+0x54/0x24c kernel_init_freeable+0x1e8/0x2c0 kernel_init+0x18/0x118 ret_from_fork+0x10/0x18 The invoke_fn hook returned OPTEE_SMC_RETURN_ETHREAD_LIMIT, indicating that the secure world threads were all in a suspended state at the time of the kernel crash. This intermittently prevented the kdump kernel from booting, resulting in a failure to collect the kernel dump. Make kernel dump collection more reliable on systems utilizing OP-TEE by refusing to load the driver under the kdump kernel. Cc: stable@vger.kernel.org Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com> Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>		2021-07-21 07:39:42 +02:00
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amdtee	tee: amdtee: unload TA only when its refcount becomes 0	2021-05-05 13:00:11 +02:00
optee	optee: Refuse to load the driver under the kdump kernel	2021-07-21 07:39:42 +02:00
Kconfig	tee: fix crypto select	2020-05-28 12:38:00 +02:00
Makefile	tee: add AMD-TEE driver	2020-01-04 13:49:51 +08:00
tee_core.c	tee: Fix fall-through warnings for Clang	2021-05-17 18:40:54 -05:00
tee_private.h	tee: don't assign shm id for private shms	2020-02-28 13:37:42 +01:00
tee_shm_pool.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282	2019-06-05 17:36:37 +02:00
tee_shm.c	tee: convert get_user_pages() --> pin_user_pages()	2020-08-25 11:01:06 +02:00