4.4-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Piggin npiggin@gmail.com
commit 741de617661794246f84a21a02fc5e327bffc9ad upstream.
opal_nvram_write currently just assumes success if it encounters an error other than OPAL_BUSY or OPAL_BUSY_EVENT. Have it return -EIO on other errors instead.
Fixes: 628daa8d5abf ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks") Cc: stable@vger.kernel.org # v3.2+ Signed-off-by: Nicholas Piggin npiggin@gmail.com Reviewed-by: Vasant Hegde hegdevasant@linux.vnet.ibm.com Acked-by: Stewart Smith stewart@linux.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/platforms/powernv/opal-nvram.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/arch/powerpc/platforms/powernv/opal-nvram.c +++ b/arch/powerpc/platforms/powernv/opal-nvram.c @@ -59,6 +59,10 @@ static ssize_t opal_nvram_write(char *bu if (rc == OPAL_BUSY_EVENT) opal_poll_events(NULL); } + + if (rc) + return -EIO; + *index += count; return count; }