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linux-stable/drivers/hwtracing/coresight
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Guilherme G. Piccoli 1adff542d6 coresight: cpu-debug: Replace mutex with mutex_trylock on panic notifier 
The panic notifier infrastructure executes registered callbacks when
a panic event happens - such callbacks are executed in atomic context,
with interrupts and preemption disabled in the running CPU and all other
CPUs disabled. That said, mutexes in such context are not a good idea.

This patch replaces a regular mutex with a mutex_trylock safer approach;
given the nature of the mutex used in the driver, it should be pretty
uncommon being unable to acquire such mutex in the panic path, hence
no functional change should be observed (and if it is, that would be
likely a deadlock with the regular mutex).

Fixes: 2227b7c746 ("coresight: add support for CPU debug module")
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220427224924.592546-10-gpiccoli@igalia.com
 		2022-05-09 16:03:24 +01:00
..
Kconfig coresight: cpu-debug: Control default behavior via Kconfig 2021-10-27 11:44:30 -06:00
Makefile coresight: syscfg: Add initial configfs support 2021-08-18 22:33:28 +02:00
coresight-catu.c Merge branch 'devel-stable' of git://git.armlinux.org.uk/~rmk/linux-arm into char-misc-next 2021-02-05 11:15:43 +01:00
coresight-catu.h coresight: tmc-etr: Add function to register catu ops 2020-09-28 19:47:42 +02:00
coresight-cfg-afdo.c coresight: config: Add preloaded configurations 2021-08-18 22:33:28 +02:00
coresight-cfg-preload.c coresight: configuration: Update API to introduce load owner concept 2021-11-26 11:27:21 -07:00
coresight-cfg-preload.h coresight: config: Add preloaded configurations 2021-08-18 22:33:28 +02:00
coresight-config.c coresight: config: Add configuration and feature generic functions 2021-08-18 22:33:27 +02:00
coresight-config.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
coresight-core.c coresight: core: Fix coresight device probe failure issue 2022-05-04 11:43:59 +01:00
coresight-cpu-debug.c coresight: cpu-debug: Replace mutex with mutex_trylock on panic notifier 2022-05-09 16:03:24 +01:00
coresight-cti-core.c coresight: cti: Correct the parameter for pm_runtime_put 2021-10-27 11:44:26 -06:00
coresight-cti-platform.c coresight: cti: Reduce scope for the variable 'cs_fwnode' in cti_plat_create_connection() 2021-02-04 17:00:32 +01:00
coresight-cti-sysfs.c coresight: cti: Initialize dynamic sysfs attributes 2020-10-29 20:10:25 +01:00
coresight-cti.h coresight: Include required headers in C files 2020-05-19 16:31:18 +02:00
coresight-etb10.c coresight: Update comments for removing cs_etm_find_snapshot() 2021-10-27 11:44:50 -06:00
coresight-etm-cp14.c coresight: Moving framework and drivers to SPDX identifier 2018-05-14 16:19:59 +02:00
coresight-etm-perf.c coresight: etm-pmu: Ensure the AUX handle is valid 2021-10-27 11:45:20 -06:00
coresight-etm-perf.h coresight: etm-perf: Update to activate selected configuration 2021-08-18 22:33:28 +02:00
coresight-etm.h coresight: etm: Clean up device specific data 2019-06-19 20:29:14 +02:00
coresight-etm3x-core.c coresight: etm3x: Cleanup ETMTECR1 register accesses 2022-04-13 11:05:17 -06:00
coresight-etm3x-sysfs.c coresight: etm3x: Cleanup ETMTECR1 register accesses 2022-04-13 11:05:17 -06:00
coresight-etm4x-cfg.c coresight: etm4x: Add complex configuration handlers to etmv4 2021-08-18 22:33:28 +02:00
coresight-etm4x-cfg.h coresight: config: Add preloaded configurations 2021-08-18 22:33:28 +02:00
coresight-etm4x-core.c coresight: etm4x: Cleanup TRCSSCCRn and TRCSSCSRn register accesses 2022-04-13 11:05:31 -06:00
coresight-etm4x-sysfs.c coresight: etm4x: Cleanup TRCRSCTLRn register accesses 2022-04-13 11:05:56 -06:00
coresight-etm4x.h coresight: etm4x: Cleanup TRCRSCTLRn register accesses 2022-04-13 11:05:56 -06:00
coresight-funnel.c Merge branch 'devel-stable' of git://git.armlinux.org.uk/~rmk/linux-arm into char-misc-next 2021-02-05 11:15:43 +01:00
coresight-platform.c hwtracing: coresight: Replace acpi_bus_get_device() 2022-03-11 10:07:34 +00:00
coresight-priv.h coresight: core: Add support for dedicated percpu sinks 2021-04-06 16:05:38 -06:00
coresight-replicator.c Merge branch 'devel-stable' of git://git.armlinux.org.uk/~rmk/linux-arm into char-misc-next 2021-02-05 11:15:43 +01:00
coresight-self-hosted-trace.h coresight: trbe: Prohibit trace before disabling TRBE 2021-10-27 11:45:33 -06:00
coresight-stm.c coresight: Use devm_bitmap_zalloc when applicable 2021-11-16 10:13:21 -07:00
coresight-syscfg-configfs.c coresight: configfs: Allow configfs to activate configuration 2021-11-26 11:34:27 -07:00
coresight-syscfg-configfs.h coresight: configfs: Allow configfs to activate configuration 2021-11-26 11:34:27 -07:00
coresight-syscfg.c coresight: syscfg: Fix memleak on registration failure in cscfg_create_device 2022-03-11 10:07:26 +00:00
coresight-syscfg.h coresight: configfs: Allow configfs to activate configuration 2021-11-26 11:34:27 -07:00
coresight-sysfs.c coresight: Export global symbols 2020-09-28 19:47:40 +02:00
coresight-tmc-core.c coresight: tmc: Configure AXI write burst size 2021-10-27 11:44:34 -06:00
coresight-tmc-etf.c coresight: Update comments for removing cs_etm_find_snapshot() 2021-10-27 11:44:50 -06:00
coresight-tmc-etr.c coresight: tmc-etr: Speed up for bounce buffer in flat mode 2021-10-27 11:44:52 -06:00
coresight-tmc.h coresight: tmc: Configure AXI write burst size 2021-10-27 11:44:34 -06:00
coresight-tpiu.c Merge branch 'devel-stable' of git://git.armlinux.org.uk/~rmk/linux-arm into char-misc-next 2021-02-05 11:15:43 +01:00
coresight-trbe.c coresight: trbe: Move check for kernel page table isolation from EL0 to probe 2022-03-11 10:07:43 +00:00
coresight-trbe.h coresight: trbe: Work around the ignored system register writes 2022-03-11 10:06:35 +00:00