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Subject[PATCH 4.16 72/81] block/swim: Fix IO error at end of medium
Date
4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Finn Thain <fthain@telegraphics.com.au>

commit 5a13388d7aa1177b98d7168330ecbeeac52f844d upstream.

Reading to the end of a 720K disk results in an IO error instead of EOF
because the block layer thinks the disk has 2880 sectors. (Partly this
is a result of inverted logic of the ONEMEG_MEDIA bit that's now fixed.)

Initialize the density and head count in swim_add_floppy() to agree
with the device size passed to set_capacity() during drive probe.

Call set_capacity() again upon device open, after refreshing the density
and head count values.

Cc: Laurent Vivier <lvivier@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: stable@vger.kernel.org # v4.14+
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/block/swim.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -612,7 +612,6 @@ static void setup_medium(struct floppy_s
struct floppy_struct *g;
fs->disk_in = 1;
fs->write_protected = swim_readbit(base, WRITE_PROT);
- fs->type = swim_readbit(base, TWOMEG_MEDIA);

if (swim_track00(base))
printk(KERN_ERR
@@ -620,6 +619,9 @@ static void setup_medium(struct floppy_s

swim_track00(base);

+ fs->type = swim_readbit(base, TWOMEG_MEDIA) ?
+ HD_MEDIA : DD_MEDIA;
+ fs->head_number = swim_readbit(base, SINGLE_SIDED) ? 1 : 2;
get_floppy_geometry(fs, 0, &g);
fs->total_secs = g->size;
fs->secpercyl = g->head * g->sect;
@@ -656,6 +658,8 @@ static int floppy_open(struct block_devi
goto out;
}

+ set_capacity(fs->disk, fs->total_secs);
+
if (mode & FMODE_NDELAY)
return 0;

@@ -808,10 +812,9 @@ static int swim_add_floppy(struct swim_p

swim_motor(base, OFF);

- if (swim_readbit(base, SINGLE_SIDED))
- fs->head_number = 1;
- else
- fs->head_number = 2;
+ fs->type = HD_MEDIA;
+ fs->head_number = 2;
+
fs->ref_count = 0;
fs->ejected = 1;


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