ACPICA: Unix application OSL: Correctly handle control-c (EINTR)

ACPICA commit dfbb87c3a96cfd007375f34a96e6f4a8ee477f97

Handle EINTR from a sem_wait operation. Ignore a control-c.

Link: https://github.com/acpica/acpica/commit/dfbb87c3
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

tools/power/acpi/os_specific/service_layers/osunixxf.c

@@ -750,9 +750,9 @@ acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 msec_timeout)
 {
 	acpi_status status = AE_OK;
 	sem_t *sem = (sem_t *) handle;
+	int ret_val;
 #ifndef ACPI_USE_ALTERNATE_TIMEOUT
 	struct timespec time;
-	int ret_val;
 #endif
 
 	if (!sem) {
@@ -778,7 +778,10 @@ acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 msec_timeout)
 
 	case ACPI_WAIT_FOREVER:
 
-		if (sem_wait(sem)) {
+		while (((ret_val = sem_wait(sem)) == -1) && (errno == EINTR)) {
+			continue;	/* Restart if interrupted */
+		}
+		if (ret_val != 0) {
 			status = (AE_TIME);
 		}
 		break;
@@ -831,7 +834,8 @@ acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 msec_timeout)
 
 		while (((ret_val = sem_timedwait(sem, &time)) == -1)
 		       && (errno == EINTR)) {
-			continue;
+			continue;	/* Restart if interrupted */
+
 		}
 
 		if (ret_val != 0) {