6.12-stable review patch. If anyone has any objections, please let me know.
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From: Rene Rebe rene@exactco.de
commit 82d20481024cbae2ea87fe8b86d12961bfda7169 upstream.
For years I wondered why the floppy driver does not just work on sparc64, e.g:
root@SUNW_375_0066:# disktype /dev/fd0 disktype: Can't open /dev/fd0: No such device or address
[ 525.341906] disktype: attempt to access beyond end of device fd0: rw=0, sector=0, nr_sectors = 16 limit=8 [ 525.341991] floppy: error 10 while reading block 0
Turns out floppy.c __floppy_read_block_0 tries to read one page for the first test read to determine the disk size and thus fails if that is greater than 4k. Adjust minimum MAX_DISK_SIZE to PAGE_SIZE to fix floppy on sparc64 and likely all other PAGE_SIZE != 4KB configs.
Cc: stable@vger.kernel.org Signed-off-by: René Rebe rene@exactco.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/block/floppy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -331,7 +331,7 @@ static bool initialized; * This default is used whenever the current disk size is unknown. * [Now it is rather a minimum] */ -#define MAX_DISK_SIZE 4 /* 3984 */ +#define MAX_DISK_SIZE (PAGE_SIZE / 1024)
/* * globals used by 'result()'