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SubjectRe: [PATCH v2.5 2/3] firmware: Add support for loading compressed files
On Thu, Jun 20, 2019 at 09:36:03AM +0200, Takashi Iwai wrote:
> On Thu, 20 Jun 2019 01:26:47 +0200,
> Luis Chamberlain wrote:
> >
> > Sorry for the late review... Ah!
>
> No problem, thanks for review.
>
> > On Tue, Jun 11, 2019 at 02:26:25PM +0200, Takashi Iwai wrote:
> > > @@ -354,7 +454,12 @@ module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
> > > MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
> > >
> > > static int
> > > -fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv)
> > > +fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
> > > + const char *suffix,
> > > + int (*decompress)(struct device *dev,
> > > + struct fw_priv *fw_priv,
> > > + size_t in_size,
> > > + const void *in_buffer))
> >
> > I *think* this could be cleaner, I'll elaborate below.
> >
> > > @@ -645,7 +768,13 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
> > > if (ret <= 0) /* error or already assigned */
> > > goto out;
> > >
> > > - ret = fw_get_filesystem_firmware(device, fw->priv);
> > > + ret = fw_get_filesystem_firmware(device, fw->priv, "", NULL);
> > > +#ifdef CONFIG_FW_LOADER_COMPRESS
> > > + if (ret == -ENOENT)
> > > + ret = fw_get_filesystem_firmware(device, fw->priv, ".xz",
> > > + fw_decompress_xz);
> > > +#endif
> >
> > Hrm, and let more #ifdef'ery.
> >
> > And so if someone wants to add bzip, we'd add yet-another if else on the
> > return value of this call... and yet more #ifdefs.
> >
> > We already have a list of paths supported. It seems what we need instead
> > is a list of supported suffixes, and a respective structure which then
> > has its set of callbacks for posthandling.
> >
> > This way, this could all be handled inside fw_get_filesystem_firmware()
> > neatly, and we can just strive towards avoiding #ifdef'ery.
>
> Yes, I had similar idea. Actually my plan for multiple compression
> formats was:
>
> - Move the decompression part into another file, e.g. decompress_xz.c
> and change in Makefile:
> firmware_class-$(CONFIG_FW_LOADER_COMPRESS_XZ) += decompress_xz.o
>
> - Create a table of the extension and the decompression,
>
> static struct fw_decompression_table fw_decompressions[] = {
> { "", NULL },
> #ifdef CONFIG_FW_LOADER_COMPRESS_XZ
> { ".xz", fw_decompress_xz },
> #endif
> #ifdef CONFIG_FW_LOADER_COMPRESS_BZIP2
> { ".bz2", fw_decompress_bzip2 },
> #endif
> .....
> };

But why? Why not just stick with one for now, we don't need a zillion
different formats to start with. Let's just stick with .xz and that's
it. There is no need to do anything else for the foreseeable future.

thanks,

greg k-h

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