linux-kernel - [PATCH v4 01/10] cdrom: add poll_event

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Message-Id: <c2bc338b4746f21b13262363d218cbb39e889970.1574355709.git.msuchanek@suse.de>
Date:   Thu, 21 Nov 2019 18:13:08 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linux-scsi@...r.kernel.org, linux-block@...r.kernel.org
Cc:     Michal Suchanek <msuchanek@...e.de>,
        Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Eric Biggers <ebiggers@...gle.com>,
        "J. Bruce Fields" <bfields@...hat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Benjamin Coddington <bcodding@...hat.com>,
        Ming Lei <ming.lei@...hat.com>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Bart Van Assche <bvanassche@....org>,
        Damien Le Moal <damien.lemoal@....com>,
        Hou Tao <houtao1@...wei.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Jan Kara <jack@...e.cz>, Hannes Reinecke <hare@...e.com>,
        "Ewan D. Milne" <emilne@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: [PATCH v4 01/10] cdrom: add poll_event_interruptible

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

Signed-off-by: Michal Suchanek <msuchanek@...e.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