linux-kernel - Re: [PATCH 4/6] USB-BKL: Remove BKL use in uhci-debug

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Date:	Wed, 02 Jun 2010 14:11:53 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	John Kacur <jkacur@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4/6] USB-BKL: Remove BKL use in uhci-debug

Hello.

Arnd Bergmann wrote:

> From: Andi Kleen <ak@...ux.intel.com>

> BKL was not really needed, just came from earlier push downs.

> The only part that's a bit dodgy is the lseek function. Would
> need another lock or atomic access to fpos on 32bit?
> Better to have a libfs lseek

> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

[...]

> diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
> index 98cf0b2..b0cf4f8 100644
> --- a/drivers/usb/host/uhci-debug.c
> +++ b/drivers/usb/host/uhci-debug.c

[...]

> @@ -539,11 +534,11 @@ static loff_t uhci_debug_lseek(struct file *file, loff_t off, int whence)
>  		new = file->f_pos + off;
>  		break;
>  	}
> +
> +	/* XXX: Can size shrink? */
>  	if (new < 0 || new > up->size) {
> -		unlock_kernel();
>  		return -EINVAL;
>  	}

    Should have dropped {}...

> -	unlock_kernel();
>  	return (file->f_pos = new);
>  }

WBR, Sergei
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