perf/imx_ddr: Fix cpu hotplug state cleanup

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[ Upstream commit 9ee68b314e ]

This driver allocates a dynamic cpu hotplug state but never releases it.
If reloaded in a loop it will quickly trigger a WARN message:

	"No more dynamic states available for CPU hotplug"

Fix by calling cpuhp_remove_multi_state on remove like several other
perf pmu drivers.

Also fix the cleanup logic on probe error paths: add the missing
cpuhp_remove_multi_state call and properly check the return value from
cpuhp_state_add_instant_nocalls.

Fixes: 9a66d36cc7 ("drivers/perf: imx_ddr: Add DDR performance counter support to perf")
Acked-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Leonard Crestez 2020-01-14 22:25:46 +02:00 • committed by Greg Kroah-Hartman

parent 4f8d534fb4

commit 4c6a908ed7

1 changed files with 11 additions and 5 deletions

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drivers/perf/fsl_imx8_ddr_perf.c

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