s390/cio: add cond_resched() in the slow_eval_known_fn() loop

[ Upstream commit 0b8eb2ee9da1e8c9b8082f404f3948aa82a057b2 ]

The scanning through subchannels during the time of an event could
take significant amount of time in case of platforms with lots of
known subchannels. This might result in higher scheduling latencies
for other tasks especially on systems with a single CPU. Add
cond_resched() call, as the loop in slow_eval_known_fn() can be
executed for a longer duration.

Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 831850435c23b37449a5eaf7f8fee1dfb94a7ea1..5734a78dbb8e66661c8b478dea13b1d5f2812a69 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -677,6 +677,11 @@ static int slow_eval_known_fn(struct subchannel *sch, void *data)
                rc = css_evaluate_known_subchannel(sch, 1);
                if (rc == -EAGAIN)
                        css_schedule_eval(sch->schid);
+               /*
+                * The loop might take long time for platforms with lots of
+                * known devices. Allow scheduling here.
+                */
+               cond_resched();
        }
        return 0;
 }