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author | Junhao He <hejunhao3@huawei.com> | 2023-08-18 11:40:52 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-13 10:42:56 +0300 |
commit | 5fa1552877ce2b692781672a5f53bb76b8bd49f8 (patch) | |
tree | e0fbe16737b3f8336e54fef2609e1e57d2e913ce /drivers/infiniband | |
parent | 848cd6f24aa72fc4f7cc2dbca6edb41edf059de5 (diff) | |
download | linux-5fa1552877ce2b692781672a5f53bb76b8bd49f8.tar.xz |
coresight: trbe: Fix TRBE potential sleep in atomic context
[ Upstream commit c0a232f1e19e378c5c4e5973a996392942c80090 ]
smp_call_function_single() will allocate an IPI interrupt vector to
the target processor and send a function call request to the interrupt
vector. After the target processor receives the IPI interrupt, it will
execute arm_trbe_remove_coresight_cpu() call request in the interrupt
handler.
According to the device_unregister() stack information, if other process
is useing the device, the down_write() may sleep, and trigger deadlocks
or unexpected errors.
arm_trbe_remove_coresight_cpu
coresight_unregister
device_unregister
device_del
kobject_del
__kobject_del
sysfs_remove_dir
kernfs_remove
down_write ---------> it may sleep
Add a helper arm_trbe_disable_cpu() to disable TRBE precpu irq and reset
per TRBE.
Simply call arm_trbe_remove_coresight_cpu() directly without useing the
smp_call_function_single(), which is the same as registering the TRBE
coresight device.
Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver")
Signed-off-by: Junhao He <hejunhao3@huawei.com>
Link: https://lore.kernel.org/r/20230814093813.19152-2-hejunhao3@huawei.com
[ Remove duplicate cpumask checks during removal ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[ v3 - Remove the operation of assigning NULL to cpudata->drvdata ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230818084052.10116-1-hejunhao3@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/infiniband')
0 files changed, 0 insertions, 0 deletions