[PATCH 4.14 79/91] rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Nicholas Piggin commit 682e6b4da5cbe8e9a53f979a58c2a9d7dc997175 upstream. The OPAL RTC driver does not sleep in case it gets OPAL_BUSY or OPAL_BUSY_EVENT from firmware,

[PATCH 4.14 79/91] rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Nicholas Piggin commit 682e6b4da5cbe8e9a53f979a58c2a9d7dc997175 upstream. The OPAL RTC driver does not sleep in case it gets OPAL_BUSY or OPAL_BUSY_EVENT from firmware, which causes large