linux-kernel - Re: [PATCH] exit early in floppy

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Message-Id: <1156840111.8433.534.camel@localhost.localdomain>
Date:	Tue, 29 Aug 2006 18:28:31 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Olaf Hering <olaf@...fle.de>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] exit early in floppy_init when no floppy exists

On Tue, 2006-08-29 at 10:07 +0200, Olaf Hering wrote:
> modprobe -v floppy on a Apple G5 writes incorrect stuff to dmesg:
> 
> Floppy drive(s): fd0 is 2.88M
> 
> The reason is that the legacy io check happens very late,
> when part of the floppy stuff is already initialized.
> check_legacy_ioport() returns either -ENODEV right away, or it walks
> the device-tree looking for a floppy node.
> 
> 
> Signed-off-by: Olaf Hering <olaf@...fle.de>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

> ---
> 
> Can this go into 2.6.18 please? Our installer parses dmesg to find
> floppy devices. Dont ask....
> 
> 
> 
> 
>  drivers/block/floppy.c |   12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> Index: linux-2.6.18-rc4/drivers/block/floppy.c
> ===================================================================
> --- linux-2.6.18-rc4.orig/drivers/block/floppy.c
> +++ linux-2.6.18-rc4/drivers/block/floppy.c
> @@ -4177,6 +4177,11 @@ static int __init floppy_init(void)
>  	int i, unit, drive;
>  	int err, dr;
>  
> +#if defined(CONFIG_PPC_MERGE)
> +	if (check_legacy_ioport(FDC1))
> +		return -ENODEV;
> +#endif
> +
>  	raw_cmd = NULL;
>  
>  	for (dr = 0; dr < N_DRIVE; dr++) {
> @@ -4234,13 +4239,6 @@ static int __init floppy_init(void)
>  	}
>  
>  	use_virtual_dma = can_use_virtual_dma & 1;
> -#if defined(CONFIG_PPC_MERGE)
> -	if (check_legacy_ioport(FDC1)) {
> -		del_timer(&fd_timeout);
> -		err = -ENODEV;
> -		goto out_unreg_region;
> -	}
> -#endif
>  	fdc_state[0].address = FDC1;
>  	if (fdc_state[0].address == -1) {
>  		del_timer(&fd_timeout);
> -
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