[PATCH] gpiolib: fix compiling when CONFIG_GPIO_CDEV_V1 is not defined

Nick Hainke
2022-12-02T14:14:43Z

If CONFIG_GPIO_CDEV_V1 is not defined compiling will fail with:

drivers/gpio/gpiolib-cdev.c: In function 'linereq_ioctl':
drivers/gpio/gpiolib-cdev.c:1468:16: error: implicit declaration of
function 'call_ioctl_locked' [-Werror=implicit-function-declaration]
1468 | return call_ioctl_locked(file, cmd, arg, lr->gdev,
| ^~~~~~~~~~~~~~~~~
drivers/gpio/gpiolib-cdev.c: In function 'linereq_poll':
drivers/gpio/gpiolib-cdev.c:1503:16: error: implicit declaration of
function 'call_poll_locked'; did you mean 'wake_up_all_locked'?
[-Werror=implicit-function-declaration]
1503 | return call_poll_locked(file, wait, lr->gdev,
linereq_poll_unlocked);
| ^~~~~~~~~~~~~~~~
| wake_up_all_locked
drivers/gpio/gpiolib-cdev.c: In function 'linereq_read':
drivers/gpio/gpiolib-cdev.c:1566:16: error: implicit declaration of
function 'call_read_locked'; did you mean 'xa_head_locked'?
[-Werror=implicit-function-declaration]
1566 | return call_read_locked(file, buf, count, f_ps, lr->gdev,
| ^~~~~~~~~~~~~~~~
| xa_head_locked

Move "call_poll_locked", "call_ioctl_locked", "call_read_locked" and
the necessary typedefs "poll_fn", "ioctl_fn", "read_fn" in front of the
ifdef-statement checking CONFIG_GPIO_CDEV_V1.

Fixes: 98d8b93c6171 ("gpiolib: protect the GPIO device against being dropped while in use by user-space")

Signed-off-by: Nick Hainke <vincent@systemli.org>
---
drivers/gpio/gpiolib-cdev.c | 50 ++++++++++++++++++-------------------
1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index e8079c1d2e1b..067e26a00775 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -61,31 +61,6 @@ static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_values), 8));
* GPIO line handle management
*/

-#ifdef CONFIG_GPIO_CDEV_V1
-/**
- * struct linehandle_state - contains the state of a userspace handle
- * @gdev: the GPIO device the handle pertains to
- * @label: consumer label used to tag descriptors
- * @descs: the GPIO descriptors held by this handle
- * @num_descs: the number of descriptors held in the descs array
- */
-struct linehandle_state {
- struct gpio_device *gdev;
- const char *label;
- struct gpio_desc *descs[GPIOHANDLES_MAX];
- u32 num_descs;
-};
-
-#define GPIOHANDLE_REQUEST_VALID_FLAGS \
- (GPIOHANDLE_REQUEST_INPUT | \
- GPIOHANDLE_REQUEST_OUTPUT | \
- GPIOHANDLE_REQUEST_ACTIVE_LOW | \
- GPIOHANDLE_REQUEST_BIAS_PULL_UP | \
- GPIOHANDLE_REQUEST_BIAS_PULL_DOWN | \
- GPIOHANDLE_REQUEST_BIAS_DISABLE | \
- GPIOHANDLE_REQUEST_OPEN_DRAIN | \
- GPIOHANDLE_REQUEST_OPEN_SOURCE)
-
typedef __poll_t (*poll_fn)(struct file *, struct poll_table_struct *);
typedef long (*ioctl_fn)(struct file *, unsigned int, unsigned long);
typedef ssize_t (*read_fn)(struct file *, char __user *,
@@ -133,6 +108,31 @@ static ssize_t call_read_locked(struct file *file, char __user *buf,
return ret;
}

+#ifdef CONFIG_GPIO_CDEV_V1
+/**
+ * struct linehandle_state - contains the state of a userspace handle
+ * @gdev: the GPIO device the handle pertains to
+ * @label: consumer label used to tag descriptors
+ * @descs: the GPIO descriptors held by this handle
+ * @num_descs: the number of descriptors held in the descs array
+ */
+struct linehandle_state {
+ struct gpio_device *gdev;
+ const char *label;
+ struct gpio_desc *descs[GPIOHANDLES_MAX];
+ u32 num_descs;
+};
+
+#define GPIOHANDLE_REQUEST_VALID_FLAGS \
+ (GPIOHANDLE_REQUEST_INPUT | \
+ GPIOHANDLE_REQUEST_OUTPUT | \
+ GPIOHANDLE_REQUEST_ACTIVE_LOW | \
+ GPIOHANDLE_REQUEST_BIAS_PULL_UP | \
+ GPIOHANDLE_REQUEST_BIAS_PULL_DOWN | \
+ GPIOHANDLE_REQUEST_BIAS_DISABLE | \
+ GPIOHANDLE_REQUEST_OPEN_DRAIN | \
+ GPIOHANDLE_REQUEST_OPEN_SOURCE)
+
static int linehandle_validate_flags(u32 flags)
{
/* Return an error if an unknown flag is set */
--
2.38.1