linux-kernel - Re: [PATCH 8/8] PCI, sys: only create rescan under /sys/.../pci/devices/... for pci bridges

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Message-ID: <20111017014527.GA7322@suse.de>
Date:	Sun, 16 Oct 2011 18:45:27 -0700
From:	Greg KH <gregkh@...e.de>
To:	Yinghai Lu <yinghai.lu@...cle.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] PCI, sys: only create rescan under
 /sys/.../pci/devices/... for pci bridges

On Sun, Oct 16, 2011 at 04:35:11PM -0700, Yinghai Lu wrote:
> On 10/16/2011 08:55 AM, Greg KH wrote:
> 
> > On Sat, Oct 15, 2011 at 10:34:03PM -0700, Yinghai Lu wrote:
> >> On 10/15/2011 07:39 PM, Greg KH wrote:
> >>
> >>>
> >>> No, we already have a way to do this, this is not acceptable, sorry.
> >>>
> >>
> >>
> >> hope this one is ok...
> > 
> > Nope, not at all, don't use #ifdef in .c files.
> > 
> > Again, we have a way to do this, built into sysfs, that can dynamically
> > know to add or not add, attributes when they are registered with the
> > system.
> 
> thank you for the comments.
> 
> i got it. now introduce device type for pci dev.
> 
> please check if this one is what you want.
> 
> [PATCH -v3 8/8] PCI, sys: only create rescan under /sys/.../pci/devices/... for pci bridges
> 
> Current code will create rescan for every pci device,
> that is not right. the device is already there, there is no reason to rescan it.
> 
> So only have rescan for pci bridges. less confusing
> 
> Also the rescan will rescan bridge's secondary bus instead of primary bus.
> 
> -v3: Use device_type for pci dev.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  drivers/pci/pci-sysfs.c |   39 +++++++++++++++++++++++++++++++++++++--
>  drivers/pci/pci.h       |    1 +
>  drivers/pci/probe.c     |    1 +
>  3 files changed, 39 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/drivers/pci/pci-sysfs.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pci-sysfs.c
> +++ linux-2.6/drivers/pci/pci-sysfs.c
> @@ -303,12 +303,15 @@ dev_rescan_store(struct device *dev, str
>  
>  	if (val) {
>  		mutex_lock(&pci_remove_rescan_mutex);
> -		pci_rescan_bus(pdev->bus);
> +		pci_rescan_bus(pdev->subordinate);
>  		mutex_unlock(&pci_remove_rescan_mutex);
>  	}
>  	return count;
>  }

This chunk is separate from the rest of the patch, right?

Please split this up into doing one thing per patch please.

greg k-h
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