Jens Wiklander 2922aff433 optee: use driver internal tee_context for some rpc ... commit aceeafefff upstream. Adds a driver private tee_context by moving the tee_context in struct optee_notif to struct optee. This tee_context was previously used when doing internal calls to secure world to deliver notification. The new driver internal tee_context is now also when allocating driver private shared memory. This decouples the shared memory object from its original tee_context. This is needed when the life time of such a memory allocation outlives the client tee_context. This patch fixes the problem described below: The addition of a shutdown hook by commit f25889f931 ("optee: fix tee out of memory failure seen during kexec reboot") introduced a kernel shutdown regression that can be triggered after running the OP-TEE xtest suites. Once the shutdown hook is called it is not possible to communicate any more with the supplicant process because the system is not scheduling task any longer. Thus if the optee driver shutdown path receives a supplicant RPC request from the OP-TEE we will deadlock the kernel's shutdown. Fixes: f25889f931 ("optee: fix tee out of memory failure seen during kexec reboot") Fixes: 217e0250cc ("tee: use reference counting for tee_context") Reported-by: Lars Persson <larper@axis.com> Cc: stable@vger.kernel.org Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> [JW: backport to 5.15-stable + update commit message] Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-03-02 11:47:51 +01:00
..
amdtee	tee: amdtee: fix an IS_ERR() vs NULL bug	2021-12-22 09:32:38 +01:00
optee	optee: use driver internal tee_context for some rpc	2022-03-02 11:47:51 +01:00
Kconfig	tee: fix crypto select	2020-05-28 12:38:00 +02:00
Makefile
tee_core.c	tee: export teedev_open() and teedev_close_context()	2022-03-02 11:47:51 +01:00
tee_private.h	tee: don't assign shm id for private shms	2020-02-28 13:37:42 +01:00
tee_shm.c	tee: handle lookup of shm with reference count 0	2021-12-29 12:28:54 +01:00
tee_shm_pool.c