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From: Michal Suchanek <msuchanek@suse.de>
To: linux-scsi@vger.kernel.org
Cc: Michal Suchanek <msuchanek@suse.de>,
        Christoph Hellwig <hch@infradead.org>,
        Matthew Wilcox <willy@infradead.org>,
        "Ewan D. Milne" <emilne@redhat.com>,
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        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v3 1/7] cdrom: add poll_event_interruptible
Date: Fri, 25 Oct 2019 13:21:38 +0200
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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 */