[PATCH v1 1/1] gpio: virtio: Fix config space reading.

[Harald Mommer]

Quote from the virtio specification chapter 4.2.2.2:

"For the device-specific configuration space, the driver MUST use 8 bit
wide accesses for 8 bit wide fields, 16 bit wide and aligned accesses
for 16 bit wide fields and 32 bit wide and aligned accesses for 32 and
64 bit wide fields."

Signed-off-by: Harald Mommer <harald.mom...@oss.qualcomm.com>
---
 drivers/gpio/gpio-virtio.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpio-virtio.c b/drivers/gpio/gpio-virtio.c
index 92b456475d89..07552611da98 100644
--- a/drivers/gpio/gpio-virtio.c
+++ b/drivers/gpio/gpio-virtio.c
@@ -527,7 +527,6 @@ static const char **virtio_gpio_get_names(struct 
virtio_gpio *vgpio,
 
 static int virtio_gpio_probe(struct virtio_device *vdev)
 {
-       struct virtio_gpio_config config;
        struct device *dev = &vdev->dev;
        struct virtio_gpio *vgpio;
        struct irq_chip *gpio_irq_chip;
@@ -540,9 +539,11 @@ static int virtio_gpio_probe(struct virtio_device *vdev)
                return -ENOMEM;
 
        /* Read configuration */
-       virtio_cread_bytes(vdev, 0, &config, sizeof(config));
-       gpio_names_size = le32_to_cpu(config.gpio_names_size);
-       ngpio = le16_to_cpu(config.ngpio);
+       gpio_names_size =
+               virtio_cread32(vdev, offsetof(struct virtio_gpio_config,
+                                             gpio_names_size));
+       ngpio =  virtio_cread16(vdev, offsetof(struct virtio_gpio_config,
+                                              ngpio));
        if (!ngpio) {
                dev_err(dev, "Number of GPIOs can't be zero\n");
                return -EINVAL;
-- 
2.43.0