[package] mountd: correctly handle poll() timeout case, solves possible 100% CPU load when idle (#7293)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27635 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 32 insertions, 0 deletions

diff --git a/package/mountd/patches/020-handle_timeout.patch b/package/mountd/patches/020-handle_timeout.patch
new file mode 100644
index 000000000..badf40fe4
--- /dev/null
+++ b/package/mountd/patches/020-handle_timeout.patch
@@ -0,0 +1,32 @@
+--- a/lib/autofs.c
++++ b/lib/autofs.c
+@@ -140,6 +140,7 @@ static int fullread(void *ptr, size_t le
+ 
+ static int autofs_in(union autofs_v5_packet_union *pkt)
+ {
++	int res;
+ 	struct pollfd fds[1];
+ 
+ 	fds[0].fd = fdout;
+@@ -147,15 +148,19 @@ static int autofs_in(union autofs_v5_pac
+ 
+ 	while(1)
+ 	{
+-		if(poll(fds, 2, 1000) == -1)
++		res = poll(fds, 1, -1);
++
++		if (res == -1)
+ 		{
+ 			if (errno == EINTR)
+ 				continue;
+ 			log_printf("failed while trying to read packet from kernel\n");
+ 			return -1;
+ 		}
+-		if(fds[0].revents & POLLIN)
++		else if ((res > 0) && (fds[0].revents & POLLIN))
++		{
+ 			return fullread(pkt, sizeof(*pkt));
++		}
+ 	}
+ }
+