linux-kernel - Re: [PATCH 3/4] [SCSI] ips: PCI API cleanups

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Message-Id: <200710250854.47197.eike-kernel@sf-tec.de>
Date:	Thu, 25 Oct 2007 08:54:41 +0200
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-scsi@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 3/4] [SCSI] ips: PCI API cleanups

Jeff Garzik wrote:
> * pass Scsi_Host to ips_remove_device() via pci_set_drvdata(),
>   allowing us to eliminate the ips_ha[] search loop and call
>   ips_release() directly.
>
> * call pci_{request,release}_regions() and eliminate individual
>   request/release_[mem_]region() calls
>
> * call pci_disable_device(), paired with pci_enable_device()
>
> * s/0/NULL/ in a few places
>
> * check ioremap() return value

> @@ -7036,32 +7042,17 @@ ips_init_phase1(struct pci_dev *pci_dev, int
> *indexPtr) uint32_t base;
>  		uint32_t offs;
>
> -		if (!request_mem_region(mem_addr, mem_len, "ips")) {
> -			IPS_PRINTK(KERN_WARNING, pci_dev,
> -				   "Couldn't allocate IO Memory space %x len %d.\n",
> -				   mem_addr, mem_len);
> -			return -1;
> -		}
> -
>  		base = mem_addr & PAGE_MASK;
>  		offs = mem_addr - base;
>  		ioremap_ptr = ioremap(base, PAGE_SIZE);

This looks odd. What are we actually doing here?

It seems that we want to map that PCI BAR. Since we're playing with PAGE_MASK 
I assume the BAR always has a length <PAGE_SIZE, else we would get page 
aligned memory anyway. If that's true something like

mem_ptr = pci_iomap(pci_dev, bar, 0)

should do the trick. Later we would do

pci_iounmap(pci_dev, mem_ptr)

This whole ioremap_ptr stuff can go away at all. Am I right? Then I'll cook up 
a patch soon.

Eike

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