Commit 296dcc40 authored Dec 31, 2018 by Finn Thain Committed by Jens Axboe Dec 31, 2018

block/swim3: Fix -EBUSY error when re-opening device after unmount



When the block device is opened with FMODE_EXCL, ref_count is set to -1.
This value doesn't get reset when the device is closed which means the
device cannot be opened again. Fix this by checking for refcount <= 0
in the release method.

Reported-and-tested-by: Stan Johnson <userm57@yahoo.com>
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent f3010ec5

drivers/block/swim3.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -995,7 +995,11 @@ static void floppy_release(struct gendisk *disk, fmode_t mode)
		struct swim3 __iomem *sw = fs->swim3;

		mutex_lock(&swim3_mutex);
		if (fs->ref_count > 0 && --fs->ref_count == 0) {
		if (fs->ref_count > 0)
		--fs->ref_count;
		else if (fs->ref_count == -1)
		fs->ref_count = 0;
		if (fs->ref_count == 0) {
		swim3_action(fs, MOTOR_OFF);
		out_8(&sw->control_bic, 0xff);
		swim3_select(fs, RELAX);