linux-kernel - Re: [PATCH 1/12] drivers/isdn/hisax/avm_pci.c: replace pci_find_device with pci_get

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Date:	Sun, 15 Jul 2007 00:59:25 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	surya.prabhakar@...ro.com
CC:	caglar@...dus.org.tr, linux-kernel@...r.kernel.org, kkeil@...e.de,
	kai.germaschewski@....de, isdn4linux@...tserv.isdn4linux.de,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 1/12] drivers/isdn/hisax/avm_pci.c: replace pci_find_device
 with pci_get_device

surya.prabhakar@...ro.com wrote:
> 
> 
> S.Çaglar Onur wrote:
>  > @@ -858,5 +858,10 @@ ready:
>  >       cs->irq_func = &avm_pcipnp_interrupt;
>  >       cs->writeisac(cs, ISAC_MASK, 0xFF);
>  >       ISACVersion(cs, (cs->subtyp == AVM_FRITZ_PCI) ? "AVM PCI:" : 
> "AVM PnP:");
>  > +     pci_dev_put(dev_avm);
>  >       return (1);
>  > +
>  > +dev_avm_cleanup:
>  > +     pci_dev_put(dev_avm);
>  > +     return (0);
>  >  }
> 
> 
>  >NAK -- every single one of these patches is wrong.  All you did was make
>  >the warning go away, while INTRODUCING new lifetime problems.
> 
>  >The ISDN PCI driver obviously continues execution after the setup
>  >function ends, yet you pci_dev_put() the device at the end of setup.  As
>  >a result, no reference is held even though we continue using the device.
> 
> This series of patches were initially released by me and were also 
> accepted by kkeil.
> It was ack'ed by keil and is now in -mm tree list of andrew morton.
> http://marc.info/?l=linux-kernel&m=118436681515269&w=2 
> <http://marc.info/?l=linux-kernel&m=118436681515269&w=2>
> 
> There are many other drivers with similar implementation. Please have a 
> look at
> linux2.6/drivers/char/sonypi.c , ide/pci/cs5530.c etc..
> 
> Moreover my earlier patch for sound/oss/trident.c was ack'ed by Alan cox 
> and is now in the
> current kernel with similar implementation.

Simple question:  where is a reference -held-, when the PCI device is in 
use?

If you cannot show this, your patch is provably wrong.  And I did not 
see a reference kept in any of your patches.

If you can show me where a reference is stored, I rescind my NAK. 
Otherwise, the patches are demonstrably, provably incorrect.

ACKs cannot get around the -facts-.

	Jeff



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