linux-kernel - [PATCH 04/19] floppy: use bdev_check_media

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Date:   Tue,  8 Sep 2020 16:53:32 +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
Subject: [PATCH 04/19] floppy: use bdev_check_media_change

Switch to use bdev_check_media_change instead of check_disk_change and
call floppy_revalidate manually.  Given that floppy_revalidate only
deals with media change events, the extra call into ->revalidate_disk
from bdev_disk_changed is not required either, so stop wiring up the
method.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/block/floppy.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index a563b023458a8b..7df79ae6b0a1e1 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -561,6 +561,7 @@ static void floppy_release_irq_and_dma(void);
  * output_byte is automatically disabled when reset is set.
  */
 static void reset_fdc(void);
+static int floppy_revalidate(struct gendisk *disk);
 
 /*
  * These are global variables, as that's the easiest way to give
@@ -3275,7 +3276,8 @@ static int invalidate_drive(struct block_device *bdev)
 	/* invalidate the buffer track to force a reread */
 	set_bit((long)bdev->bd_disk->private_data, &fake_change);
 	process_fd_request();
-	check_disk_change(bdev);
+	if (bdev_check_media_change(bdev))
+		floppy_revalidate(bdev->bd_disk);
 	return 0;
 }
 
@@ -4123,7 +4125,8 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 			drive_state[drive].last_checked = 0;
 			clear_bit(FD_OPEN_SHOULD_FAIL_BIT,
 				  &drive_state[drive].flags);
-			check_disk_change(bdev);
+			if (bdev_check_media_change(bdev))
+				floppy_revalidate(bdev->bd_disk);
 			if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags))
 				goto out;
 			if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags))
@@ -4291,7 +4294,6 @@ static const struct block_device_operations floppy_fops = {
 	.ioctl			= fd_ioctl,
 	.getgeo			= fd_getgeo,
 	.check_events		= floppy_check_events,
-	.revalidate_disk	= floppy_revalidate,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl		= fd_compat_ioctl,
 #endif
-- 
2.28.0