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Date: Tue, 31 Aug 2021 02:25:22 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: "Enrico Weigelt, metux IT consult" <info@...ux.net>,
Viresh Kumar <vireshk@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Jason Wang <jasowang@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
kernel test robot <lkp@...el.com>,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] gpio: virtio: Fix sparse warnings
On Tue, Aug 31, 2021 at 10:59:25AM +0530, Viresh Kumar wrote:
> Fix warnings reported by sparse, related to type mismatch between u16
> and __le16.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: 3a29355a22c0 ("gpio: Add virtio-gpio driver")
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
I'm not sure which tree has the above commit - can this be squashed?
Also, the driver lacks a MAINTAINERS entry - we want at least
L: virtualization@...ts.linux-foundation.org
on all virtio drivers.
> ---
> drivers/gpio/gpio-virtio.c | 41 ++++++++++++++++----------------
> include/uapi/linux/virtio_gpio.h | 10 ++++----
> 2 files changed, 25 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpio/gpio-virtio.c b/drivers/gpio/gpio-virtio.c
> index d33eb237c0b9..d24f1c9264bc 100644
> --- a/drivers/gpio/gpio-virtio.c
> +++ b/drivers/gpio/gpio-virtio.c
> @@ -32,7 +32,6 @@ struct virtio_gpio {
> struct virtio_device *vdev;
> struct mutex lock; /* Protects virtqueue operation */
> struct gpio_chip gc;
> - struct virtio_gpio_config config;
> struct virtio_gpio_line *lines;
> struct virtqueue *request_vq;
> };
> @@ -57,7 +56,7 @@ static int _virtio_gpio_req(struct virtio_gpio *vgpio, u16 type, u16 gpio,
>
> req->type = cpu_to_le16(type);
> req->gpio = cpu_to_le16(gpio);
> - req->value = txvalue;
> + req->value = cpu_to_le32(txvalue);
>
> sg_init_one(&req_sg, req, sizeof(*req));
> sg_init_one(&res_sg, res, rxlen);
> @@ -233,19 +232,19 @@ static int virtio_gpio_alloc_vqs(struct virtio_gpio *vgpio,
> return 0;
> }
>
> -static const char **virtio_gpio_get_names(struct virtio_gpio *vgpio)
> +static const char **virtio_gpio_get_names(struct virtio_gpio *vgpio,
> + u32 gpio_names_size, u16 ngpio)
> {
> - struct virtio_gpio_config *config = &vgpio->config;
> struct virtio_gpio_response_get_names *res;
> struct device *dev = &vgpio->vdev->dev;
> u8 *gpio_names, *str;
> const char **names;
> int i, ret, len;
>
> - if (!config->gpio_names_size)
> + if (!gpio_names_size)
> return NULL;
>
> - len = sizeof(*res) + config->gpio_names_size;
> + len = sizeof(*res) + gpio_names_size;
> res = devm_kzalloc(dev, len, GFP_KERNEL);
> if (!res)
> return NULL;
> @@ -258,18 +257,18 @@ static const char **virtio_gpio_get_names(struct virtio_gpio *vgpio)
> return NULL;
> }
>
> - names = devm_kcalloc(dev, config->ngpio, sizeof(*names), GFP_KERNEL);
> + names = devm_kcalloc(dev, ngpio, sizeof(*names), GFP_KERNEL);
> if (!names)
> return NULL;
>
> /* NULL terminate the string instead of checking it */
> - gpio_names[config->gpio_names_size - 1] = '\0';
> + gpio_names[gpio_names_size - 1] = '\0';
>
> - for (i = 0, str = gpio_names; i < config->ngpio; i++) {
> + for (i = 0, str = gpio_names; i < ngpio; i++) {
> names[i] = str;
> str += strlen(str) + 1; /* zero-length strings are allowed */
>
> - if (str > gpio_names + config->gpio_names_size) {
> + if (str > gpio_names + gpio_names_size) {
> dev_err(dev, "gpio_names block is too short (%d)\n", i);
> return NULL;
> }
> @@ -280,31 +279,31 @@ 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 virtio_gpio_config config;
> struct device *dev = &vdev->dev;
> struct virtio_gpio *vgpio;
> + u32 gpio_names_size;
> + u16 ngpio;
> int ret, i;
>
> vgpio = devm_kzalloc(dev, sizeof(*vgpio), GFP_KERNEL);
> if (!vgpio)
> return -ENOMEM;
>
> - config = &vgpio->config;
> -
> /* Read configuration */
> - virtio_cread_bytes(vdev, 0, config, sizeof(*config));
> - config->gpio_names_size = le32_to_cpu(config->gpio_names_size);
> - config->ngpio = le16_to_cpu(config->ngpio);
> - if (!config->ngpio) {
> + virtio_cread_bytes(vdev, 0, &config, sizeof(config));
> + gpio_names_size = le32_to_cpu(config.gpio_names_size);
> + ngpio = le16_to_cpu(config.ngpio);
> + if (!ngpio) {
> dev_err(dev, "Number of GPIOs can't be zero\n");
> return -EINVAL;
> }
>
> - vgpio->lines = devm_kcalloc(dev, config->ngpio, sizeof(*vgpio->lines), GFP_KERNEL);
> + vgpio->lines = devm_kcalloc(dev, ngpio, sizeof(*vgpio->lines), GFP_KERNEL);
> if (!vgpio->lines)
> return -ENOMEM;
>
> - for (i = 0; i < config->ngpio; i++) {
> + for (i = 0; i < ngpio; i++) {
> mutex_init(&vgpio->lines[i].lock);
> init_completion(&vgpio->lines[i].completion);
> }
> @@ -319,7 +318,7 @@ static int virtio_gpio_probe(struct virtio_device *vdev)
> vgpio->gc.direction_output = virtio_gpio_direction_output;
> vgpio->gc.get = virtio_gpio_get;
> vgpio->gc.set = virtio_gpio_set;
> - vgpio->gc.ngpio = config->ngpio;
> + vgpio->gc.ngpio = ngpio;
> vgpio->gc.base = -1; /* Allocate base dynamically */
> vgpio->gc.label = dev_name(dev);
> vgpio->gc.parent = dev;
> @@ -333,7 +332,7 @@ static int virtio_gpio_probe(struct virtio_device *vdev)
> /* Mark the device ready to perform operations from within probe() */
> virtio_device_ready(vdev);
>
> - vgpio->gc.names = virtio_gpio_get_names(vgpio);
> + vgpio->gc.names = virtio_gpio_get_names(vgpio, gpio_names_size, ngpio);
>
> ret = gpiochip_add_data(&vgpio->gc, vgpio);
> if (ret) {
> diff --git a/include/uapi/linux/virtio_gpio.h b/include/uapi/linux/virtio_gpio.h
> index 844574acf095..0445f905d8cc 100644
> --- a/include/uapi/linux/virtio_gpio.h
> +++ b/include/uapi/linux/virtio_gpio.h
> @@ -22,16 +22,16 @@
> #define VIRTIO_GPIO_DIRECTION_IN 0x02
>
> struct virtio_gpio_config {
> - __u16 ngpio;
> + __le16 ngpio;
> __u8 padding[2];
> - __u32 gpio_names_size;
> + __le32 gpio_names_size;
> } __packed;
>
> /* Virtio GPIO Request / Response */
> struct virtio_gpio_request {
> - __u16 type;
> - __u16 gpio;
> - __u32 value;
> + __le16 type;
> + __le16 gpio;
> + __le32 value;
> };
>
> struct virtio_gpio_response {
> --
> 2.31.1.272.g89b43f80a514
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