powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()

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: 628daa8 ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Cc: [email protected] # v3.2+
Signed-off-by: Nicholas Piggin <[email protected]>
Reviewed-by: Vasant Hegde <[email protected]>
Acked-by: Stewart Smith <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>

Author: npiggin

arch/powerpc/platforms/powernv/opal-nvram.c

@@ -59,6 +59,10 @@ static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
 		if (rc == OPAL_BUSY_EVENT)
 			opal_poll_events(NULL);
 	}
+
+	if (rc)
+		return -EIO;
+
 	*index += count;
 	return count;
 }