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env_nand: return error when no device is found

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Currently, if there is an error probing the NAND chip and the env is based
in NAND, the readenv() function will use a NULL function pointer and thus
jump to address 0.

Here I just check for a non-zero value of blocksize as that shouldn't be
zero when a valid device is found, but perhaps there is a better way for
someone familiar with the NAND internals to suggest.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>
This commit is contained in:
Mike Frysinger 2010-08-11 23:42:26 -04:00 • committed by Scott Wood
parent 668a6b4591
commit 962ad59e25
1 changed files with 2 additions and 0 deletions
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2
common/env_nand.c
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@ -266,6 +266,8 @@ int readenv (size_t offset, u_char * buf)
u_char *char_ptr;
blocksize = nand_info[0].erasesize;
if (!blocksize)
return 1;
len = min(blocksize, CONFIG_ENV_SIZE);
while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {