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a8bd68e432
When mtk-cmdq unbinds, a WARN_ON message with condition
pm_runtime_get_sync() < 0 occurs.
According to the call tracei below:
cmdq_mbox_shutdown
mbox_free_channel
mbox_controller_unregister
__devm_mbox_controller_unregister
...
The root cause can be deduced to be calling pm_runtime_get_sync() after
calling pm_runtime_disable() as observed below:
1. CMDQ driver uses devm_mbox_controller_register() in cmdq_probe()
to bind the cmdq device to the mbox_controller, so
devm_mbox_controller_unregister() will automatically unregister
the device bound to the mailbox controller when the device-managed
resource is removed. That means devm_mbox_controller_unregister()
and cmdq_mbox_shoutdown() will be called after cmdq_remove().
2. CMDQ driver also uses devm_pm_runtime_enable() in cmdq_probe() after
devm_mbox_controller_register(), so that devm_pm_runtime_disable()
will be called after cmdq_remove(), but before
devm_mbox_controller_unregister().
To fix this problem, cmdq_probe() needs to move
devm_mbox_controller_register() after devm_pm_runtime_enable() to make
devm_pm_runtime_disable() be called after
devm_mbox_controller_unregister().
Fixes:
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.. | ||
arm_mhu_db.c | ||
arm_mhu.c | ||
arm_mhuv2.c | ||
arm_mhuv3.c | ||
armada-37xx-rwtm-mailbox.c | ||
bcm2835-mailbox.c | ||
bcm-flexrm-mailbox.c | ||
bcm-pdc-mailbox.c | ||
hi3660-mailbox.c | ||
hi6220-mailbox.c | ||
imx-mailbox.c | ||
Kconfig | ||
mailbox-altera.c | ||
mailbox-mpfs.c | ||
mailbox-sti.c | ||
mailbox-test.c | ||
mailbox-xgene-slimpro.c | ||
mailbox.c | ||
mailbox.h | ||
Makefile | ||
mtk-adsp-mailbox.c | ||
mtk-cmdq-mailbox.c | ||
omap-mailbox.c | ||
pcc.c | ||
pl320-ipc.c | ||
platform_mhu.c | ||
qcom-apcs-ipc-mailbox.c | ||
qcom-cpucp-mbox.c | ||
qcom-ipcc.c | ||
rockchip-mailbox.c | ||
sprd-mailbox.c | ||
stm32-ipcc.c | ||
sun6i-msgbox.c | ||
tegra-hsp.c | ||
ti-msgmgr.c | ||
zynqmp-ipi-mailbox.c |