Duoming Zhou 50f79a2abb arch: xtensa: platforms: Fix deadlock in rs_close() ... [ Upstream commit eb5adc7075 ] There is a deadlock in rs_close(), which is shown below: (Thread 1) | (Thread 2) | rs_open() rs_close() | mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rs_poll() del_timer_sync() | spin_lock() //(2) (wait timer to stop) | ... We hold timer_lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need timer_lock in position (2) of thread 2. As a result, rs_close() will block forever. This patch deletes the redundant timer_lock in order to prevent the deadlock. Because there is no race condition between rs_close, rs_open and rs_poll. Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Message-Id: <20220407154430.22387-1-duoming@zju.edu.cn> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-05-09 09:14:40 +02:00
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boot	xtensa: fix DTC warning unit_address_format	2022-04-13 20:59:09 +02:00
configs	drivers/char: remove /dev/kmem for good	2021-05-07 00:26:34 -07:00
include	xtensa: fix xtensa_wsr always writing 0	2022-04-08 14:23:03 +02:00
kernel	xtensa: fix a7 clobbering in coprocessor context load/store	2022-04-27 14:38:59 +02:00
lib	xtensa: propagate the calling conventions change down into csum_partial_copy_generic()	2020-08-20 15:45:21 -04:00
mm	xtensa: define update_mmu_tlb function	2022-04-08 14:23:03 +02:00
platforms	arch: xtensa: platforms: Fix deadlock in rs_close()	2022-05-09 09:14:40 +02:00
variants	xtensa: add test_kc705_be variant	2018-08-20 12:34:45 -07:00
Kbuild	xtensa: move core-y in arch/xtensa/Makefile to arch/xtensa/Kbuild	2021-08-11 11:37:13 -07:00
Kconfig	Tracing updates for 5.15:	2021-09-05 11:50:41 -07:00
Kconfig.debug	xtensa: make stack dump size configurable	2019-11-26 11:33:39 -08:00
Makefile	xtensa: move core-y in arch/xtensa/Makefile to arch/xtensa/Kbuild	2021-08-11 11:37:13 -07:00