[U-Boot] [PATCH v4 2/2] common: Generic firmware loader for file system

["Lothar Waßmann" <LW@KARO-electronics.de>]

Hi,

On Mon, 18 Dec 2017 13:10:56 +0800 tien.fong.chee at intel.com wrote:
> From: Tien Fong Chee <tien.fong.chee@intel.com>
> 
> This is file system generic loader which can be used to load
> the file image from the storage into target such as memory.
> The consumer driver would then use this loader to program whatever,
> ie. the FPGA device.
> 
> Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
> ---
>  common/Makefile            |   1 +
>  common/fs_loader.c         | 311 +++++++++++++++++++++++++++++++++++++++++++++
>  doc/README.firmware_loader |  77 +++++++++++
>  include/fs_loader.h        |  28 ++++
>  4 files changed, 417 insertions(+)
>  create mode 100644 common/fs_loader.c
>  create mode 100644 doc/README.firmware_loader
>  create mode 100644 include/fs_loader.h
> 
[...]
> diff --git a/common/fs_loader.c b/common/fs_loader.c
> new file mode 100644
> index 0000000..81cf5d6
> --- /dev/null
> +++ b/common/fs_loader.c
[...]
> +/*
> + * Prepare firmware struct;
> + * return -ve if fail.
> + */
> +static int _request_firmware_prepare(struct firmware **firmware_p,
> +				     const char *name, void *dbuf,
> +				     size_t size, u32 offset)
> +{
> +	struct firmware *firmware = NULL;
> +	struct firmware_priv *fw_priv = NULL;
> +
> +	*firmware_p = NULL;
> +
> +	if (!name || name[0] == '\0')
> +		return -EINVAL;
> +
> +	*firmware_p = firmware = calloc(1, sizeof(*firmware));
> +
> +	if (!firmware) {
> +		printf("%s: calloc(struct firmware) failed\n", __func__);
> +		return -ENOMEM;
> +	}
> +
> +	fw_priv = calloc(1, sizeof(*fw_priv));
> +
> +	if (!fw_priv) {
> +		printf("%s: calloc(struct fw_priv) failed\n", __func__);
> +		return -ENOMEM;
What about freeing 'firmware' and NULLing *firmware_p here?
Or better, do the assignment of *firmware_p at the end.

> +	}
> +
> +	fw_priv->name = name;
> +	fw_priv->offset = offset;
> +	firmware->data = dbuf;
> +	firmware->size = size;
> +	firmware->priv = fw_priv;
> +
> +	return 0;
> +}
> +
> +/*
> + * fw_get_filesystem_firmware - load firmware into an allocated buffer
> + * @location: An array of supported firmware location
> + * @firmware_p: pointer to firmware image
> + *
> + * @return: size of total read
> + *	    -ve when error
> + */
> +static int fw_get_filesystem_firmware(struct device_location *location,
> +				      struct firmware *firmware_p)
> +{
> +	struct firmware_priv *fw_priv = NULL;
> +	loff_t actread;
> +	char *dev_part;
> +	int ret;
> +
> +	dev_part = env_get("FW_DEV_PART");
> +	if (dev_part)
> +		set_storage_devpart(location->name, dev_part);
> +
> +	ret = init_storage_device(location);
> +	if (ret)
> +		goto out;
> +
> +	select_fs_dev(location);
> +	if (ret)
> +		goto out;
> +
> +	fw_priv = (struct firmware_priv *)firmware_p->priv;
> +
useless type cast.

> +	ret = fs_read(fw_priv->name, (ulong)firmware_p->data, fw_priv->offset,
> +		     firmware_p->size, &actread);
> +
> +	if (ret || (actread != firmware_p->size)) {
> +		printf("Error: %d Failed to read %s from flash %lld != %d.\n",
> +		      ret, fw_priv->name, actread, firmware_p->size);
> +		return -EPERM;
Quoting myself from an earlier mail
(20171212091442.2f6826fe at karo-electronics.de):
|That's definitely not the right return code in this situation.
|If 'ret' is != 0 you should return 'ret', otherwise EIO is more
|appropriate here.



Lothar Waßmann