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authorroyger <royger@FreeBSD.org>2015-12-18 14:52:12 +0000
committerroyger <royger@FreeBSD.org>2015-12-18 14:52:12 +0000
commit40f9a4207f94b185d4e437f0c9f2b731fef7addb (patch)
tree20f2ed54e576921fde1024d9a58d462651926964 /sys/dev/hyperv
parent75b1bfea2ec70f7408f7a35d7fba606774176333 (diff)
downloadFreeBSD-src-40f9a4207f94b185d4e437f0c9f2b731fef7addb.zip
FreeBSD-src-40f9a4207f94b185d4e437f0c9f2b731fef7addb.tar.gz
MFC r292258:
hyperv/kvp: wake up the daemon if it's sleeping due to poll() Submitted by: Dexuan Cui <decui@microsoft.com> Sponsored by: Microsoft OSTC
Diffstat (limited to 'sys/dev/hyperv')
-rw-r--r--sys/dev/hyperv/utilities/hv_kvp.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/dev/hyperv/utilities/hv_kvp.c b/sys/dev/hyperv/utilities/hv_kvp.c
index 4598510..58d565c4 100644
--- a/sys/dev/hyperv/utilities/hv_kvp.c
+++ b/sys/dev/hyperv/utilities/hv_kvp.c
@@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#include <sys/reboot.h>
#include <sys/lock.h>
#include <sys/taskqueue.h>
+#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <sys/poll.h>
#include <sys/proc.h>
@@ -114,6 +115,8 @@ static struct cdev *hv_kvp_dev;
static struct hv_kvp_msg *hv_kvp_dev_buf;
struct proc *daemon_task;
+static struct selinfo hv_kvp_selinfo;
+
/*
* Global state to track and synchronize multiple
* KVP transaction requests from the host.
@@ -628,6 +631,9 @@ hv_kvp_send_msg_to_daemon(void)
/* Send the msg to user via function deamon_read - setting sema */
sema_post(&kvp_globals.dev_sema);
+
+ /* We should wake up the daemon, in case it's doing poll() */
+ selwakeup(&hv_kvp_selinfo);
}
@@ -940,7 +946,7 @@ hv_kvp_dev_daemon_write(struct cdev *dev __unused, struct uio *uio, int ioflag _
* for daemon to read.
*/
static int
-hv_kvp_dev_daemon_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
+hv_kvp_dev_daemon_poll(struct cdev *dev __unused, int events, struct thread *td)
{
int revents = 0;
@@ -953,6 +959,9 @@ hv_kvp_dev_daemon_poll(struct cdev *dev __unused, int events, struct thread *td
*/
if (kvp_globals.daemon_busy == true)
revents = POLLIN;
+ else
+ selrecord(td, &hv_kvp_selinfo);
+
mtx_unlock(&kvp_globals.pending_mutex);
return (revents);
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