[PATCH 4/6] xfree86: Keep trying to set interface on drm for 2 seconds.

[Bryce Harrington]

And if we've had to delay booting due to not being able to set the
interface, fess up.

Signed-off-by: Bryce Harrington <bryce at canonical.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 hw/xfree86/os-support/linux/lnx_platform.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/hw/xfree86/os-support/linux/lnx_platform.c b/hw/xfree86/os-support/linux/lnx_platform.c
index 3ae2db1..10c8ecf 100644
--- a/hw/xfree86/os-support/linux/lnx_platform.c
+++ b/hw/xfree86/os-support/linux/lnx_platform.c
@@ -26,16 +26,26 @@ get_drm_info(struct OdevAttributes *attribs, char *path)
     char *buf;
     int fd;
     int err = 0;
+    int tries = 0;
 
     fd = open(path, O_RDWR, O_CLOEXEC);
     if (fd == -1)
         return FALSE;
 
-    sv.drm_di_major = 1;
-    sv.drm_di_minor = 4;
-    sv.drm_dd_major = -1;       /* Don't care */
-    sv.drm_dd_minor = -1;       /* Don't care */
-    err = drmSetInterfaceVersion(fd, &sv);
+    while (tries++ < 200) {
+	sv.drm_di_major = 1;
+	sv.drm_di_minor = 4;
+	sv.drm_dd_major = -1;       /* Don't care */
+	sv.drm_dd_minor = -1;       /* Don't care */
+
+	err = drmSetInterfaceVersion(fd, &sv);
+	if (!err) {
+	    if (tries > 1)
+		LogMessage(X_INFO, "setversion 1.4 succeeded on try #%d\n", tries);
+	    break;
+	}
+	usleep(10000);
+    }
     if (err) {
         ErrorF("setversion 1.4 failed: %s\n", strerror(-err));
 	goto out;
-- 
1.7.9.5