Re: [Qemu-devel] [PATCH v2 2/2] fdc: fix media detection

[Markus Armbruster]

Pavel Hrdina <address@hidden> writes:

> We have to set up 'media_changed' after guest start so floppy driver
> could detect that there is no media in drive. For this purpose we call
> 'fdctrl_change_cb' instead of 'fd_revalidate' in 'fdctrl_connect_drives'.
> 'fd_revalidate' is called inside 'fdctrl_change_cb'.
>
> We still have to set default drive geometry in 'fd_revalidate' even
> if there is no media in drive. When you try to open (windows) or mount (linux)
> floppy the driver tries to seek on track 1. Linux guest hang in loop than 
> crash
> and windows guest print error message.

Got one nitpick inline.

> Signed-off-by: Pavel Hrdina <address@hidden>
> ---
>  hw/fdc.c |   14 ++++++++------
>  1 files changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/hw/fdc.c b/hw/fdc.c
> index cb4cd25..b1bc6ed 100644
> --- a/hw/fdc.c
> +++ b/hw/fdc.c
> @@ -179,12 +179,14 @@ static void fd_revalidate(FDrive *drv)
>      FDriveRate rate;
>  
>      FLOPPY_DPRINTF("revalidate\n");
> -    if (drv->bs != NULL && bdrv_is_inserted(drv->bs)) {
> +    if (drv->bs != NULL) {
>          ro = bdrv_is_read_only(drv->bs);
>          bdrv_get_floppy_geometry_hint(drv->bs, &nb_heads, &max_track,
>                                        &last_sect, drv->drive, &drive, &rate);
> -        if (nb_heads != 0 && max_track != 0 && last_sect != 0) {
> -            FLOPPY_DPRINTF("User defined disk (%d %d %d)",
> +        if (!bdrv_is_inserted(drv->bs)) {
> +            FLOPPY_DPRINTF("No disk in drive\n");
> +        } else if (nb_heads != 0 && max_track != 0 && last_sect != 0) {
> +            FLOPPY_DPRINTF("User defined disk (%d %d %d)\n",
>                             nb_heads - 1, max_track, last_sect);
>          } else {
>              FLOPPY_DPRINTF("Floppy disk (%d h %d t %d s) %s\n", nb_heads,
> @@ -201,7 +203,7 @@ static void fd_revalidate(FDrive *drv)
>          drv->drive = drive;
>          drv->media_rate = rate;
>      } else {
> -        FLOPPY_DPRINTF("No disk in drive\n");
> +        FLOPPY_DPRINTF("Invalid disk in drive\n");

Misleading.  What !drv->bs actually means is "no drive connected".

>          drv->last_sect = 0;
>          drv->max_track = 0;
>          drv->flags &= ~FDISK_DBL_SIDES;
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