linux-kernel - [PATCH 06/19] swim: simplify media change handling

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Message-Id: <20200908145347.2992670-7-hch@lst.de>
Date:   Tue,  8 Sep 2020 16:53:34 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Denis Efremov <efremov@...ux.com>, Tim Waugh <tim@...erelk.net>,
        Michal Simek <michal.simek@...inx.com>,
        Borislav Petkov <bp@...en8.de>,
        "David S. Miller" <davem@...emloft.net>,
        Song Liu <song@...nel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Finn Thain <fthain@...egraphics.com.au>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-m68k@...ts.linux-m68k.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH 06/19] swim: simplify media change handling

floppy_revalidate mostly duplicates work already done in floppy_open
despite only beeing called from floppy_open.  Remove the function and
just clear the ->ejected flag directly under the right condition.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 drivers/block/swim.c | 24 ++----------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index d4565c555b289f..52dd1efa00f9c5 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -217,8 +217,6 @@ extern int swim_read_sector_header(struct swim __iomem *base,
 extern int swim_read_sector_data(struct swim __iomem *base,
 				 unsigned char *data);
 
-static int floppy_revalidate(struct gendisk *disk);
-
 static DEFINE_MUTEX(swim_mutex);
 static inline void set_swim_mode(struct swim __iomem *base, int enable)
 {
@@ -640,8 +638,8 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 		return 0;
 
 	if (mode & (FMODE_READ|FMODE_WRITE)) {
-		if (bdev_check_media_change(bdev))
-			floppy_revalidate(bdev->bd_disk);
+		if (bdev_check_media_change(bdev) && fs->disk_in)
+			fs->ejected = 0;
 		if ((mode & FMODE_WRITE) && fs->write_protected) {
 			err = -EROFS;
 			goto out;
@@ -738,24 +736,6 @@ static unsigned int floppy_check_events(struct gendisk *disk,
 	return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
 }
 
-static int floppy_revalidate(struct gendisk *disk)
-{
-	struct floppy_state *fs = disk->private_data;
-	struct swim __iomem *base = fs->swd->base;
-
-	swim_drive(base, fs->location);
-
-	if (fs->ejected)
-		setup_medium(fs);
-
-	if (!fs->disk_in)
-		swim_motor(base, OFF);
-	else
-		fs->ejected = 0;
-
-	return !fs->disk_in;
-}
-
 static const struct block_device_operations floppy_fops = {
 	.owner		 = THIS_MODULE,
 	.open		 = floppy_unlocked_open,
-- 
2.28.0