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If udl is to busy to process our UDLIO_DAMAGE drawing request, let wsudl

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sleep for a bit before retrying, so we don't overload the kernel by busy
looping.

Tested and agreed matthieu@
This commit is contained in:
mglocker 2009-09-23 20:09:03 +00:00
parent 7c562918ba
commit 21fe69d289
1 changed files with 4 additions and 1 deletions
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5
driver/xf86-video-wsudl/src/wsudl_driver.c
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@ -1,4 +1,4 @@
/* $OpenBSD: wsudl_driver.c,v 1.2 2009/09/22 22:00:54 matthieu Exp $ */
/* $OpenBSD: wsudl_driver.c,v 1.3 2009/09/23 20:09:03 mglocker Exp $ */
/*
* Copyright (c) 2009 Marcus Glocker <mglocker@openbsd.org>
@ -61,6 +61,7 @@
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <dev/wscons/wsconsio.h>
#include <dev/usb/udlio.h>
@ -835,6 +836,8 @@ WsudlBlockHandler(pointer data, struct timeval **waitTime,
ioctl(fPtr->fd, UDLIO_DAMAGE, &d);
if (d.status == UDLIO_STATUS_OK)
break;
/* device driver busy, have a break */
usleep(10000);
}
if (i == ULDIO_DAMAGE_RETRY) {
ErrorF("damage command failed, giving up!\n");