On Tue, Jun 11, 2019 at 01:30:58PM +0100, Charles Keepax wrote: > In preparation for more refactoring make i2c_acpi_get_irq available > outside i2c-core-acpi.c. > > Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx> > --- > > Changes since v3: > - Move the change to use the helper function from i2c-core-base into its own patch. > > Thanks, > Charles > > drivers/i2c/i2c-core-acpi.c | 15 +++++++++++++-- > drivers/i2c/i2c-core.h | 7 +++++++ > 2 files changed, 20 insertions(+), 2 deletions(-) > > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > index 7d4d66ba752d4..35966cc337dde 100644 > --- a/drivers/i2c/i2c-core-acpi.c > +++ b/drivers/i2c/i2c-core-acpi.c > @@ -144,8 +144,17 @@ static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data) > return 1; /* No need to add resource to the list */ > } > > -static int i2c_acpi_get_irq(struct acpi_device *adev) > +/** > + * i2c_acpi_get_irq - get device IRQ number from ACPI > + * @client: Pointer to the I2C client device > + * > + * Find the IRQ number used by a specific client device. > + * > + * Return: The IRQ number or an error code. > + */ > +int i2c_acpi_get_irq(struct i2c_client *client) > { > + struct acpi_device *adev = ACPI_COMPANION(&client->adapter->dev); Is this adev checked for being NULL somewhere below before it is being dereferenced? It could explain the issue Benjamin is seeing. > struct list_head resource_list; > int irq = -ENOENT; > int ret;