netdev - Re: [PATCH 2/6] [RFC] qlge: New Driver: Adding main driver file qlge

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Date:	Wed, 27 Aug 2008 07:11:27 -0700
From:	Ron Mercer <ron.mercer@...gic.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	jeff@...zik.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/6] [RFC] qlge: New Driver: Adding main driver file qlge_main.c.

On Tue, Aug 26, 2008 at 12:24:21PM +0100, Ben Hutchings wrote:

> > +static int ql_adapter_initialize(struct ql_adapter *qdev)
> > +{
> > +	u32 value, mask;
> > +	int i;
> > +	int status = 0;
> > +
> > +	/*
> > +	 * Set up the System register to halt on errors.
> > +	 */
> > +	value = SYS_EFE | SYS_FAE;
> > +	mask = value << 16;
> > +	ql_write32(qdev, SYS, mask | value);
> > +
> > +	/* Set the default queue. */
> > +	value = NIC_RCV_CFG_DFQ;
> > +	mask = NIC_RCV_CFG_DFQ_MASK;
> > +	ql_write32(qdev, NIC_RCV_CFG, (mask | value));
> > +
> > +	/* Set the MPI interrupt to enabled. */
> > +	ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16) | INTR_MASK_PI);
> > +
> > +	/* Enable the function, set pagesize, enable error checking. */
> > +	value = FSC_FE | FSC_EPC_INBOUND | FSC_EPC_OUTBOUND | FSC_EC;
> > +
> > +	if (PAGE_SHIFT == 12)	/* 4k pages */
> > +		value |= FSC_VM_PAGE_4K;
> > +	else if (PAGE_SHIFT == 13)	/* 8k pages */
> > +		value |= FSC_VM_PAGE_8K;
> > +	else if (PAGE_SHIFT == 16)	/* 64k pages */
> > +		value |= FSC_VM_PAGE_64K;
> > +	else {
> > +		QPRINTK(IFUP, ERR, "Invalid page size of %d.\n",
> > +			1 << PAGE_SHIFT);
> 
> You can use
> 	BUILD_BUG_ON(PAGE_SHIFT != 12 && PAGE_SHIFT != 13 && PAGE_SHIFT != 16);
> to detect this problem at compile time.
> 
> Why doesn't this function do any cleanup in case of failure part way
> through?
> 
> [...]

Ben, I realized I did not completely answer your question here. 
The reason there is not cleanup when a failure occurs is because all that has been done is some chip
initialization.  If ql_adapter_initialize fails the calling function
will reset the chip and do the rest of the cleanup.

Thanks,
Ron
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