[PATCH 3.16 076/366] powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()

[Ben Hutchings <ben@xxxxxxxxxxxxxxx>]

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Piggin <npiggin@xxxxxxxxx>

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")
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Reviewed-by: Vasant Hegde <hegdevasant@xxxxxxxxxxxxxxxxxx>
Acked-by: Stewart Smith <stewart@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 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
@@ -58,6 +58,10 @@ 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;
 }