[PATCH v2 11/11] FIT: add support to cache opened fit images

[Marco Felsch]

On 24-06-17, Sascha Hauer wrote:
> On Thu, Jun 13, 2024 at 02:58:18PM +0200, Marco Felsch wrote:
> > Cache the FIT image fit_open() calls to avoid loading the same FIT image
> > twice. This is very useful if the same FIT image is used to provide the
> > base devicetree, kernel and initrd as well as devicetree overlays.
> > 
> > Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
> > ---
> >  common/image-fit.c  | 38 +++++++++++++++++++++++++++++++++++++-
> >  include/image-fit.h |  4 ++++
> >  2 files changed, 41 insertions(+), 1 deletion(-)
> > 
> > diff --git a/common/image-fit.c b/common/image-fit.c
> > index c5c88ebe4c1e..061825f5f22c 100644
> > --- a/common/image-fit.c
> > +++ b/common/image-fit.c
> > @@ -18,6 +18,8 @@
> >  #include <fnmatch.h>
> >  #include <malloc.h>
> >  #include <linux/ctype.h>
> > +#include <linux/minmax.h>
> > +#include <linux/refcount.h>
> >  #include <asm/byteorder.h>
> >  #include <errno.h>
> >  #include <linux/err.h>
> > @@ -34,6 +36,8 @@
> >  #define CHECK_LEVEL_SIG 2
> >  #define CHECK_LEVEL_MAX 3
> >  
> > +LIST_HEAD(open_fits);
> 
> Should be static

Sure!

> > +
> >  static uint32_t dt_struct_advance(struct fdt_header *f, uint32_t dt, int size)
> >  {
> >  	dt += size;
> > @@ -861,6 +865,22 @@ void *fit_open_configuration(struct fit_handle *handle, const char *name)
> >  	return conf_node;
> >  }
> >  
> > +static struct fit_handle *fit_get_handle(const char *filename)
> > +{
> > +	size_t query_len = strlen(filename);
> > +	struct fit_handle *handle;
> > +
> > +	list_for_each_entry(handle, &open_fits, entry) {
> > +		size_t len = strlen(handle->filename);
> > +
> > +		len = min(len, query_len);
> > +		if (!strncmp(filename, handle->filename, len))
> > +			return handle;
> 
> Why not plain strcmp() here?

Good question, I will change this, thanks.

Regards,
  Marco

> 
> Sascha
> 
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