[PATCH v3 1/7] cdrom: add poll_event_interruptible

Michal Suchanek
2019-10-25T11:21:52Z

Add convenience macro for polling an event that does not have a
waitqueue.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
drivers/cdrom/cdrom.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index ac42ae4651ce..2ad6b73482fe 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -282,10 +282,24 @@
#include <linux/fcntl.h>
#include <linux/blkdev.h>
#include <linux/times.h>
+#include <linux/delay.h>
#include <linux/uaccess.h>
+#include <linux/sched/signal.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_request.h>

+#define poll_event_interruptible(event, interval) ({ \
+ int ret = 0; \
+ while (!(event)) { \
+ if (signal_pending(current)) { \
+ ret = -ERESTARTSYS; \
+ break; \
+ } \
+ msleep_interruptible(interval); \
+ } \
+ ret; \
+})
+
/* used to tell the module to turn on full debugging messages */
static bool debug;
/* default compatibility mode */
--
2.23.0