Jassi Brar e1d8263a59 mailbox: avoid timer start from callback ... [ Upstream commit c7dacf5b0f ] If the txdone is done by polling, it is possible for msg_submit() to start the timer while txdone_hrtimer() callback is running. If the timer needs recheduling, it could already be enqueued by the time hrtimer_forward_now() is called, leading hrtimer to loudly complain. WARNING: CPU: 3 PID: 74 at kernel/time/hrtimer.c:932 hrtimer_forward+0xc4/0x110 CPU: 3 PID: 74 Comm: kworker/u8:1 Not tainted 5.9.0-rc2-00236-gd3520067d01c-dirty #5 Hardware name: Libre Computer AML-S805X-AC (DT) Workqueue: events_freezable_power_ thermal_zone_device_check pstate: 20000085 (nzCv daIf -PAN -UAO BTYPE=--) pc : hrtimer_forward+0xc4/0x110 lr : txdone_hrtimer+0xf8/0x118 [...] This can be fixed by not starting the timer from the callback path. Which requires the timer reloading as long as any message is queued on the channel, and not just when current tx is not done yet. Fixes: 0cc67945ea ("mailbox: switch to hrtimer for tx_complete polling") Reported-by: Da Xue <da@libre.computer> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Tested-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Jerome Brunet <jbrunet@baylibre.com> Tested-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-10-29 09:07:11 +01:00
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arm_mhu.c
bcm-flexrm-mailbox.c	mailbox: bcm-flexrm-mailbox: Fix FlexRM ring flush timeout issue	2019-03-23 14:35:15 +01:00
bcm-pdc-mailbox.c
bcm2835-mailbox.c
hi6220-mailbox.c
Kconfig
mailbox-altera.c
mailbox-sti.c
mailbox-test.c	mailbox: mailbox-test: fix null pointer if no mmio	2019-12-05 15:38:31 +01:00
mailbox-xgene-slimpro.c	mailbox: xgene-slimpro: Fix potential NULL pointer dereference	2018-09-09 19:55:54 +02:00
mailbox.c	mailbox: avoid timer start from callback	2020-10-29 09:07:11 +01:00
mailbox.h
Makefile
omap-mailbox.c
pcc.c	mailbox: reset txdone_method TXDONE_BY_POLL if client knows_txdone	2019-11-12 19:18:23 +01:00
pl320-ipc.c
platform_mhu.c
qcom-apcs-ipc-mailbox.c
rockchip-mailbox.c
tegra-hsp.c
ti-msgmgr.c