linux-kernel - Re: [PATCH] atheros/atlx: Simplify bit manipulations

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Message-ID: <20150123202619.GA10084@electric-eye.fr.zoreil.com>
Date:	Fri, 23 Jan 2015 21:26:19 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:	Jay Cliburn <jcliburn@...il.com>,
	Chris Snook <chris.snook@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] atheros/atlx: Simplify bit manipulations

Rasmus Villemoes <linux@...musvillemoes.dk> :
[...]
> diff --git a/drivers/net/ethernet/atheros/atlx/atl2.c b/drivers/net/ethernet/atheros/atlx/atl2.c
> index 84a09e8ddd9c..46d1b959daa8 100644
> --- a/drivers/net/ethernet/atheros/atlx/atl2.c
> +++ b/drivers/net/ethernet/atheros/atlx/atl2.c
> @@ -1278,14 +1278,10 @@ static void atl2_setup_pcicmd(struct pci_dev *pdev)
>  
>  	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
>  
> -	if (cmd & PCI_COMMAND_INTX_DISABLE)
> -		cmd &= ~PCI_COMMAND_INTX_DISABLE;
> -	if (cmd & PCI_COMMAND_IO)
> -		cmd &= ~PCI_COMMAND_IO;
> -	if (0 == (cmd & PCI_COMMAND_MEMORY))
> -		cmd |= PCI_COMMAND_MEMORY;
> -	if (0 == (cmd & PCI_COMMAND_MASTER))
> -		cmd |= PCI_COMMAND_MASTER;
> +	cmd &= ~PCI_COMMAND_INTX_DISABLE;
> +	cmd &= ~PCI_COMMAND_IO;
> +	cmd |= PCI_COMMAND_MEMORY;
> +	cmd |= PCI_COMMAND_MASTER;
>  	pci_write_config_word(pdev, PCI_COMMAND, cmd);

Mostly open-coded pci_set_master, pci_enable_device_mem and pci_intx.

I'd suggest to ignore the PCI_COMMAND_IO bit at all then use the standard
pci helpers.

-- 
Ueimor
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