From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 19 Jun 2020 10:27:31 +0000 (+1000)
Subject: sim_console: Fix polling to check for POLLIN
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fc4e13ae67ef7d49480cd0095850814c0d040583;p=microwatt.git

sim_console: Fix polling to check for POLLIN

Under some circumstances we get POLLHUP which we incorrectly
treat as having a character in the buffer.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

diff --git a/sim_console_c.c b/sim_console_c.c
index b3920c1..a2c9d55 100644
--- a/sim_console_c.c
+++ b/sim_console_c.c
@@ -71,8 +71,11 @@ void sim_console_poll(unsigned char *__rt)
 	ret = poll(fdset, 1, 0);
 	//fprintf(stderr, "poll returns %d\n", ret);
 
-	if (ret == 1)
-		val = 1;
+	if (ret == 1) {
+		if (fdset[0].revents & POLLIN)
+			val = 1;
+//		fprintf(stderr, "poll revents: 0x%x\n", fdset[0].revents);
+	}
 
 	to_std_logic_vector(val, __rt, 64);
 }