linux-kernel - Re: [PATCH] dl2k: Implement suspend

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Message-ID: <20151116235525.GA3700@electric-eye.fr.zoreil.com>
Date:	Tue, 17 Nov 2015 00:55:25 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dl2k: Implement suspend

Ondrej Zary <linux@...nbow-software.org> :
[...]
> diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c
> index ccca479..23d13c5 100644
> --- a/drivers/net/ethernet/dlink/dl2k.c
> +++ b/drivers/net/ethernet/dlink/dl2k.c
[..]
> @@ -522,6 +515,28 @@ rio_open (struct net_device *dev)
>  	macctrl |= (np->tx_flow) ? TxFlowControlEnable : 0;
>  	macctrl |= (np->rx_flow) ? RxFlowControlEnable : 0;
>  	dw16(MACCtrl, macctrl);
> +}
> +
> +static int rio_open(struct net_device *dev)
> +{
> +	struct netdev_private *np = netdev_priv(dev);
> +	const int irq = np->pdev->irq;
> +	int i;
> +
> +	i = request_irq(irq, rio_interrupt, IRQF_SHARED, dev->name, dev);
> +	if (i)
> +		return i;
> +
> +	alloc_list(dev);
> +
> +	rio_hw_init(dev);

- request shared irq
- allocate memory
- init chipset

It may have worked so far but you ought to nail it before your
changes start to look like regression (if shit can happen, it will).

Btw:
- alloc_list should not be allowed to return partially filled receive
  ring. Please make it return a proper status code.
  The driver itself should rather drop received data than leave holes
  in its receive ring.
- the suspend / resume logic does not need a complete free / alloc
  cycle. Use the same buffers and reset the cur_tx, cur_rx indexes
  as needed.

Go wild.

-- 
Ueimor
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