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powerpc/nvram_64: Check nvram_error_log_index in nvram_clear_error_log()

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nvram_clear_error_log() calls ppc_md.nvram_write() even when
nvram_error_log_index is -1 (invalid). The nvram_write() function does
not check for a negative offset.

Check nvram_error_log_index as the other nvram log functions do.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Thomas Gleixner 2009-10-14 22:54:40 +00:00 committed by Benjamin Herrenschmidt
parent ae7dd0208f
commit fd62c6c448
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/nvram_64.c
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@ -681,6 +681,9 @@ int nvram_clear_error_log(void)
int clear_word = ERR_FLAG_ALREADY_LOGGED;
int rc;
if (nvram_error_log_index == -1)
return -1;
tmp_index = nvram_error_log_index;
rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);