[Cbe-oss-dev] [PATCH 4/5] spidernet: fix error interrupt handling

[Jens Osterkamp]

On Friday 11 January 2008, Ishizaki Kou wrote:
> In addition to the value of GHIINT0STS, spidernet interrupt handler
> should check the values of GHIINT1STS/GHIINT2STS registers at the
> beginning of spider_net_interrupt() so as not to drop error
> interrupts.
> 
> GHIINT1STS/GHIINT2STS registers indicates some of erroneous conditions
> in spidernet, and a few bits of GHIINT0STS register reflects these
> conditions. But GHIINT0MSK masks these bits, so you should check these
> conditions by reading GHIINT1STS/GHIINT2STS registers directly.
> 
> Signed-off-by: Kou Ishizaki <kou.ishizaki at toshiba.co.jp>

Acked-by: Jens Osterkamp <jens at de.ibm.com>

> 
> Index: linux-powerpc-git/drivers/net/spider_net.c
> ===================================================================
> --- linux-powerpc-git.orig/drivers/net/spider_net.c
> +++ linux-powerpc-git/drivers/net/spider_net.c
> @@ -1415,18 +1415,12 @@ spider_net_link_reset(struct net_device 
>   * found when an interrupt is presented
>   */
>  static void
> -spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
> +spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
> +			    u32 error_reg1, u32 error_reg2)
>  {
> -	u32 error_reg1, error_reg2;
>  	u32 i;
>  	int show_error = 1;
> 
> -	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
> -	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
> -
> -	error_reg1 &= SPIDER_NET_INT1_MASK_VALUE;
> -	error_reg2 &= SPIDER_NET_INT2_MASK_VALUE;
> -
>  	/* check GHIINT0STS ************************************/
>  	if (status_reg)
>  		for (i = 0; i < 32; i++)
> @@ -1656,12 +1650,15 @@ spider_net_interrupt(int irq, void *ptr)
>  {
>  	struct net_device *netdev = ptr;
>  	struct spider_net_card *card = netdev_priv(netdev);
> -	u32 status_reg;
> +	u32 status_reg, error_reg1, error_reg2;
> 
>  	status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
> -	status_reg &= SPIDER_NET_INT0_MASK_VALUE;
> +	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
> +	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
> 
> -	if (!status_reg)
> +	if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
> +	    !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
> +	    !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
>  		return IRQ_NONE;
> 
>  	if (status_reg & SPIDER_NET_RXINT ) {
> @@ -1676,7 +1673,8 @@ spider_net_interrupt(int irq, void *ptr)
>  		spider_net_link_reset(netdev);
> 
>  	if (status_reg & SPIDER_NET_ERRINT )
> -		spider_net_handle_error_irq(card, status_reg);
> +		spider_net_handle_error_irq(card, status_reg,
> +					    error_reg1, error_reg2);
> 
>  	/* clear interrupt sources */
>  	spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
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> 



-- 

Gruß,

Jens

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