From c073b25dad0c2668b73ae9e8652bc3b8012e762b Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Tue, 7 Sep 2021 22:33:02 +0200 Subject: i2c: i801: Stop using pm_runtime_set_autosuspend_delay(-1) The original change works as intended, but Andy pointed in [0] that now userspace could re-enable RPM via sysfs, even though we explicitly want to disable it. So effectively revert the original patch, just with small improvements: - Calls to pm_runtime_allow()/pm_runtime_forbid() don't have to be balanced, so we can remove the call to pm_runtime_forbid() in i801_remove(). - priv->acpi_reserved is accessed after i801_acpi_remove(), and according to Robert [1] the custom handler can't run any longer. Therefore we don't have to take priv->acpi_lock. [0] https://www.spinics.net/lists/linux-i2c/msg52730.html [1] https://lore.kernel.org/linux-acpi/BYAPR11MB32561D19A0FD9AB93E2B1E5287D39@BYAPR11MB3256.namprd11.prod.outlook.com/T/#t Fixes: 4e60d5dd10cd ("i2c: i801: Improve disabling runtime pm") Reported-by: Andy Shevchenko Signed-off-by: Heiner Kallweit Acked-by: Rafael J. Wysocki Reviewed-by: Jean Delvare Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-i801.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 260fc41b5ca7..115660dce722 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1615,7 +1615,7 @@ i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits, * BIOS is accessing the host controller so prevent it from * suspending automatically from now on. */ - pm_runtime_set_autosuspend_delay(&pdev->dev, -1); + pm_runtime_get_sync(&pdev->dev); } if ((function & ACPI_IO_MASK) == ACPI_READ) @@ -1866,9 +1866,6 @@ static void i801_remove(struct pci_dev *dev) { struct i801_priv *priv = pci_get_drvdata(dev); - pm_runtime_forbid(&dev->dev); - pm_runtime_get_noresume(&dev->dev); - i801_disable_host_notify(priv); i801_del_mux(priv); i2c_del_adapter(&priv->adapter); @@ -1877,6 +1874,10 @@ static void i801_remove(struct pci_dev *dev) platform_device_unregister(priv->tco_pdev); + /* if acpi_reserved is set then usage_count is incremented already */ + if (!priv->acpi_reserved) + pm_runtime_get_noresume(&dev->dev); + /* * do not call pci_disable_device(dev) since it can cause hard hangs on * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010) -- cgit v1.2.3