From: Brian Norris briannorris@chromium.org

stable inclusion from stable-v6.6.51 commit d034bff62faea1a2219e0d2f3d17263265f24087 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAU9NV CVE: CVE-2024-46846

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit be721b451affbecc4ba4eaac3b71cdbdcade1b1b upstream.

Commit e882575efc77 ("spi: rockchip: Suspend and resume the bus during NOIRQ_SYSTEM_SLEEP_PM ops") stopped respecting runtime PM status and simply disabled clocks unconditionally when suspending the system. This causes problems when the device is already runtime suspended when we go to sleep -- in which case we double-disable clocks and produce a WARNing.

Switch back to pm_runtime_force_{suspend,resume}(), because that still seems like the right thing to do, and the aforementioned commit makes no explanation why it stopped using it.

Also, refactor some of the resume() error handling, because it's not actually a good idea to re-disable clocks on failure.

Fixes: e882575efc77 ("spi: rockchip: Suspend and resume the bus during NOIRQ_SYSTEM_SLEEP_PM ops") Cc: stable@vger.kernel.org Reported-by: Ondřej Jirman megi@xff.cz Closes: https://lore.kernel.org/lkml/20220621154218.sau54jeij4bunf56@core/ Signed-off-by: Brian Norris briannorris@chromium.org Link: https://patch.msgid.link/20240827171126.1115748-1-briannorris@chromium.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zucheng zhengzucheng@huawei.com --- drivers/spi/spi-rockchip.c | 23 +++++++---------------- 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 5b010094dace..1f374cf4d6f6 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -974,14 +974,16 @@ static int rockchip_spi_suspend(struct device *dev) { int ret; struct spi_controller *ctlr = dev_get_drvdata(dev); - struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);

ret = spi_controller_suspend(ctlr); if (ret < 0) return ret;

- clk_disable_unprepare(rs->spiclk); - clk_disable_unprepare(rs->apb_pclk); + ret = pm_runtime_force_suspend(dev); + if (ret < 0) { + spi_controller_resume(ctlr); + return ret; + }

pinctrl_pm_select_sleep_state(dev);

@@ -992,25 +994,14 @@ static int rockchip_spi_resume(struct device *dev) { int ret; struct spi_controller *ctlr = dev_get_drvdata(dev); - struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);

pinctrl_pm_select_default_state(dev);

- ret = clk_prepare_enable(rs->apb_pclk); + ret = pm_runtime_force_resume(dev); if (ret < 0) return ret;

- ret = clk_prepare_enable(rs->spiclk); - if (ret < 0) - clk_disable_unprepare(rs->apb_pclk); - - ret = spi_controller_resume(ctlr); - if (ret < 0) { - clk_disable_unprepare(rs->spiclk); - clk_disable_unprepare(rs->apb_pclk); - } - - return 0; + return spi_controller_resume(ctlr); } #endif /* CONFIG_PM_SLEEP */