6.1-stable review patch. If anyone has any objections, please let me know.
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From: Breno Leitao leitao@debian.org
[ Upstream commit 14d069d92951a3e150c0a81f2ca3b93e54da913b ]
On ACPI machines, the tegra i2c module encounters an issue due to a mutex being called inside a spinlock. This leads to the following bug:
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:585 ...
Call trace: __might_sleep __mutex_lock_common mutex_lock_nested acpi_subsys_runtime_resume rpm_resume tegra_i2c_xfer
The problem arises because during __pm_runtime_resume(), the spinlock &dev->power.lock is acquired before rpm_resume() is called. Later, rpm_resume() invokes acpi_subsys_runtime_resume(), which relies on mutexes, triggering the error.
To address this issue, devices on ACPI are now marked as not IRQ-safe, considering the dependency of acpi_subsys_runtime_resume() on mutexes.
Fixes: bd2fdedbf2ba ("i2c: tegra: Add the ACPI support") Cc: stable@vger.kernel.org # v5.17+ Co-developed-by: Michael van der Westhuizen rmikey@meta.com Signed-off-by: Michael van der Westhuizen rmikey@meta.com Signed-off-by: Breno Leitao leitao@debian.org Reviewed-by: Dmitry Osipenko digetx@gmail.com Reviewed-by: Andy Shevchenko andy@kernel.org Signed-off-by: Andi Shyti andi.shyti@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/i2c/busses/i2c-tegra.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 3792531b7ab7f..f7b4977d66496 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -1832,9 +1832,9 @@ static int tegra_i2c_probe(struct platform_device *pdev) * domain. * * VI I2C device shouldn't be marked as IRQ-safe because VI I2C won't - * be used for atomic transfers. + * be used for atomic transfers. ACPI device is not IRQ safe also. */ - if (!IS_VI(i2c_dev)) + if (!IS_VI(i2c_dev) && !has_acpi_companion(i2c_dev->dev)) pm_runtime_irq_safe(i2c_dev->dev);
pm_runtime_enable(i2c_dev->dev);