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api: fix a potential serious bug caused by undef CONFIG_SYS_64BIT_LBA

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The api_public.h header file undefined macro CONFIG_SYS_64BIT_LBA.

But api/api_storage.c includes this header before including part.h,
causing the type of lbaint_t and subsequently the type signature of
blk_dread() and blk_dwrite() functions to change from the rest of U-Boot
(if CONFIG_SYS_64BIT_LBA is defined for the board).

This is of course wrong, because the call to blk_dread() / blk_dwrite()
will receive mangled arguments.

Fix this by removing the undef of macro CONFIG_SYS_64BIT_LBA and instead
make the immediate code do what it would do as if the macro was not
defined.

Add a FIXME to whoever is maintaining this code.

CI managed to trigger this bug when compiling for lsxhl_defconfig, which
has CONFIG_API selected. The compiler complained about blk_dwrite() and
blk_dread() not matching original declarations:

  include/blk.h:280:15: warning: type of ‘blk_dwrite’ does not match
                                 original declaration
				 [-Wlto-type-mismatch]
  280 | unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t st
      |               ^
  drivers/block/blk-uclass.c:456:15: note: type mismatch in parameter 2
  456 | unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t st
      |               ^

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Marek Behún 2021-03-06 23:43:22 +01:00 committed by Tom Rini
parent ccc58b4d32
commit d32211ee95
1 changed files with 18 additions and 5 deletions
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23
include/api_public.h
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@ -70,12 +70,25 @@ struct sys_info {
int mr_no; /* number of memory regions */
};
#undef CONFIG_SYS_64BIT_LBA
#ifdef CONFIG_SYS_64BIT_LBA
typedef u_int64_t lbasize_t;
#else
/*
* FIXME: Previously this code was:
*
* #undef CONFIG_SYS_64BIT_LBA
* #ifdef CONFIG_SYS_64BIT_LBA
* typedef u_int64_t lbasize_t;
* #else
* typedef unsigned long lbasize_t;
* #endif
*
* But we cannot just undefine CONFIG_SYS_64BIT_LBA, because then in
* api/api_storage.c the type signature of lbaint_t will be different if
* CONFIG_SYS_64BIT_LBA is enabled for the board, which can result in various
* bugs.
* So simply define lbasize_t as an unsigned long, since this was what was done
* anyway for at least 13 years, but don't undefine CONFIG_SYS_64BIT_LBA.
*/
typedef unsigned long lbasize_t;
#endif
typedef unsigned long lbastart_t;
#define DEV_TYP_NONE 0x0000