linux-kernel - Re: [PATCH 2.6.19-rc1 update4] drivers: add LCD support

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Message-Id: <20061026220703.37182521.akpm@osdl.org>
Date:	Thu, 26 Oct 2006 22:07:03 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Miguel Ojeda Sandonis <maxextreme@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.19-rc1 update4] drivers: add LCD support

On Thu, 26 Oct 2006 17:48:58 +0000
Miguel Ojeda Sandonis <maxextreme@...il.com> wrote:

>  
> +DECLARE_MUTEX(cfag12864bfb_sem);

Mutexes are preferred - please only use semaphores if their counting
feature is required.

This lock can have static scope.

> +struct page *cfag12864bfb_vma_nopage(struct vm_area_struct *vma,
> +	unsigned long address, int *type)

This function can have static scope.

> +{
> +	struct page *page;
> +	down(&cfag12864bfb_sem);
> +
> +	page = virt_to_page(cfag12864b_buffer);
> +	get_page(page);
> +
> +	if(type)
> +		*type = VM_FAULT_MINOR;
> +
> +	up(&cfag12864bfb_sem);
> +	return page;
> +}

What's the semaphore actually needed for?

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