Re: [PATCH] Tulip interrupt uses non IRQ safe spinlock

[Jeff Garzik]

Mark Broadbent wrote:
> The interrupt handling code in the tulip network driver appears to use a non 
> IRQ safe spinlock in an interrupt context.  The following patch should correct 
> this.
>
> Signed-off-by: Mark Broadbent <markb@xxxxxxxxxxxxxx>
>
> Index: linux-2.6.11/drivers/net/tulip/interrupt.c
> ===================================================================
> --- linux-2.6.11.orig/drivers/net/tulip/interrupt.c	2005-03-07 18:11:23.000000000 +0000
> +++ linux-2.6.11/drivers/net/tulip/interrupt.c	2005-04-28 16:16:23.000000000 +0100
> @@ -567,8 +567,9 @@
>  
>  		if (csr5 & (TxNoBuf | TxDied | TxIntr | TimerInt)) {
>  			unsigned int dirty_tx;
> +			unsigned long flags;
>  
> -			spin_lock(&tp->lock);
> +			spin_lock_irqsave(&tp->lock, flags);
>  
>  			for (dirty_tx = tp->dirty_tx; tp->cur_tx - dirty_tx > 0;
>  				 dirty_tx++) {
> @@ -640,7 +641,7 @@
>  						   dev->name, csr5, ioread32(ioaddr + CSR6), tp->csr6);
>  				tulip_restart_rxtx(tp);
>  			}
> -			spin_unlock(&tp->lock);
> +			spin_unlock_irqrestore(&tp->lock, flags);

It's already inside the interrupt handler, so this patch is not needed.

	Jeff



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