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From:   Arnd Bergmann <arnd@arndb.de>
To:     "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Cc:     Arnd Bergmann <arnd@arndb.de>, linux-block@vger.kernel.org,
        Jens Axboe <axboe@kernel.dk>, Hannes Reinecke <hare@suse.de>,
        Martin Wilck <mwilck@suse.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>,
        =?UTF-8?q?Diego=20Elio=20Petten=C3=B2?= <flameeyes@flameeyes.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v3 08/22] compat_ioctl: cdrom: handle CDROM_LAST_WRITTEN
Date:   Thu,  2 Jan 2020 15:55:26 +0100
Message-Id: <20200102145552.1853992-9-arnd@arndb.de>
In-Reply-To: <20200102145552.1853992-1-arnd@arndb.de>
References: <20200102145552.1853992-1-arnd@arndb.de>
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This is the only ioctl command that does not have a proper
compat handler. Making the normal implementation do the
right thing is actually very simply, so just do that by
using an in_compat_syscall() check to avoid the special
case in the pkcdvd driver.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/block/pktcdvd.c | 24 +-----------------------
 drivers/cdrom/cdrom.c   |  7 ++++---
 2 files changed, 5 insertions(+), 26 deletions(-)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index ab4d3be4b646..5f970a7d32c0 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2663,26 +2663,6 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
 	return ret;
 }
 
-#ifdef CONFIG_COMPAT
-static int pkt_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
-{
-	switch (cmd) {
-	/* compatible */
-	case CDROMEJECT:
-	case CDROMMULTISESSION:
-	case CDROMREADTOCENTRY:
-	case CDROM_SEND_PACKET: /* compat mode handled in scsi_cmd_ioctl */
-	case SCSI_IOCTL_SEND_COMMAND:
-		return pkt_ioctl(bdev, mode, cmd, (unsigned long)compat_ptr(arg));
-
-	/* FIXME: no handler so far */
-	default:
-	case CDROM_LAST_WRITTEN:
-		return -ENOIOCTLCMD;
-	}
-}
-#endif
-
 static unsigned int pkt_check_events(struct gendisk *disk,
 				     unsigned int clearing)
 {
@@ -2704,9 +2684,7 @@ static const struct block_device_operations pktcdvd_ops = {
 	.open =			pkt_open,
 	.release =		pkt_close,
 	.ioctl =		pkt_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl =		pkt_compat_ioctl,
-#endif
+	.compat_ioctl =		blkdev_compat_ptr_ioctl,
 	.check_events =		pkt_check_events,
 };
 
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 48095025e588..faca0f346fff 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -3293,9 +3293,10 @@ static noinline int mmc_ioctl_cdrom_last_written(struct cdrom_device_info *cdi,
 	ret = cdrom_get_last_written(cdi, &last);
 	if (ret)
 		return ret;
-	if (copy_to_user((long __user *)arg, &last, sizeof(last)))
-		return -EFAULT;
-	return 0;
+	if (in_compat_syscall())
+		return put_user(last, (__s32 __user *)arg);
+
+	return put_user(last, (long __user *)arg);
 }
 
 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
-- 
2.20.0