linux-kernel - Re: [PATCH] mxser: PCI refcounts

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Message-ID: <450BF0A1.4040807@gmail.com>
Date:	Sat, 16 Sep 2006 14:39:38 +0159
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mxser: PCI refcounts

Alan Cox wrote:
> Switch to pci ref counts for mxser when handling PCI devices. Use
> pci_get_device and drop the reference when we finish and unload.

Please, don't do that. These all drivers need to be rewritten to pci probing 
(for this one I have a patch, but I waited for confirmation of previous 
patchset, but nothing has come, so perhaps I will clone it as NEW/EXPERIMENTAL 
1.9.1-with-pci-probing-driver) and when pci_find_device is there, we can `grep 
-r` it to know, which drivers need that. The same holds for zoran cards, which 
somebody wanted to play with (and rework), but as I can see, nothing happened :/.

[Changes in devices such as mtd are OK in my eyes...]

> Signed-off-by: Alan Cox <alan@...hat.com>
> 
> diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.18-rc6-mm1/drivers/char/mxser.c linux-2.6.18-rc6-mm1/drivers/char/mxser.c
> --- linux.vanilla-2.6.18-rc6-mm1/drivers/char/mxser.c	2006-09-11 17:00:09.000000000 +0100
> +++ linux-2.6.18-rc6-mm1/drivers/char/mxser.c	2006-09-14 16:14:52.000000000 +0100
> @@ -538,6 +538,7 @@
>  			if (pdev != NULL) {	/* PCI */
>  				release_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2));
>  				release_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3));
> +				pci_dev_put(pdev);
>  			} else {
>  				release_region(mxsercfg[i].ioaddr[0], 8 * mxsercfg[i].ports);
>  				release_region(mxsercfg[i].vector, 1);
> @@ -862,9 +865,9 @@
>  	index = 0;
>  	b = 0;
>  	while (b < n) {
> -		pdev = pci_find_device(mxser_pcibrds[b].vendor,
> +		pdev = pci_get_device(mxser_pcibrds[b].vendor,
>  				mxser_pcibrds[b].device, pdev);
> -			if (pdev == NULL) {
> +		if (pdev == NULL) {
>  			b++;
>  			continue;
>  		}
> @@ -916,6 +919,9 @@
>  			if (mxser_initbrd(m, &hwconf) < 0)
>  				continue;
>  			m++;
> +			/* Keep an extra reference if we succeeded. It will
> +			   be returned at unload time */
> +			pci_dev_get(pdev);
>  		}
>  	}
>  #endif
> 

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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