From: Greg KH <gregkh@suse.de>
To: Matthew Wilcox <matthew@wil.cx>
Cc: linux-kernel@vger.kernel.org, linux-pci@atrey.karlin.mff.cuni.cz,
greg@kroah.com, prarit@sgi.com
Subject: Re: PCI: fix an oops in some pci devices on hotplug remove when their resources are being freed.
Date: Fri, 1 Apr 2005 19:31:41 -0800 [thread overview]
Message-ID: <20050402033141.GA16556@kroah.com> (raw)
In-Reply-To: <20050402011023.GG21986@parcelfarce.linux.theplanet.co.uk>
On Sat, Apr 02, 2005 at 02:10:23AM +0100, Matthew Wilcox wrote:
> On Fri, Apr 01, 2005 at 03:47:50PM -0800, Greg KH wrote:
> > PCI: fix an oops in some pci devices on hotplug remove when their resources are being freed.
> >
> > As reported by Prarit Bhargava <prarit@sgi.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
> >
> > diff -Nru a/drivers/pci/remove.c b/drivers/pci/remove.c
> > for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> > struct resource *res = dev->resource + i;
> > - if (res->parent)
> > + if (res && res->parent)
> > release_resource(res);
>
> I can't believe this fixes anything. How can res possibly be NULL here?
> It's a pointer into a pci_dev.
I agree. However, SGI seems to have some majorly <insert expletive here>
hardware and drivers that cause this line to release a already released
resource. See the other part of this patch for the part where this
resource is supposedly freed up.
I took the patch as it doesn't hurt anyone, and it gets them off of my
back. But if you so much as think this patch isn't needed, I'll gladly
revert it, as I'm really not trusting any PCI hotplug patches coming out
from them anymore...
thanks,
greg k-h
next prev parent reply other threads:[~2005-04-02 3:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-01 23:45 [BK PATCH] PCI update for 2.6.12-rc1 Greg KH
2005-04-01 23:47 ` PCI: increase the size of the pci.ids strings Greg KH
2005-04-01 23:47 ` Remove item from feature-removal-schedule.txt that was already removed from the kernel Greg KH
2005-04-01 23:47 ` PCI: add CONFIG_PCI_NAMES to the feature-removal-schedule.txt file Greg KH
2005-04-01 23:47 ` [PATCH] PCI: sync up with the latest pci.ids file from sf.net Greg KH
2005-04-01 23:47 ` [PATCH] PCI: Add PCI device ID for new Mellanox HCA Greg KH
2005-04-01 23:47 ` [PATCH] PCI: Patch for Serverworks chips in hotplug environment Greg KH
2005-04-01 23:47 ` PCI: fix an oops in some pci devices on hotplug remove when their resources are being freed Greg KH
2005-04-01 23:47 ` [PATCH] PCI: trivial DBG tidy-up Greg KH
2005-04-01 23:47 ` [PATCH] PCI Hotplug: remove code duplication in drivers/pci/hotplug/ibmphp_pci.c Greg KH
2005-04-01 23:47 ` [PATCH] PCI Hotplug: only call ibmphp_remove_resource() if argument is not NULL Greg KH
2005-04-01 23:47 ` [PATCH] PCI: 80 column lines Greg KH
2005-04-01 23:47 ` [PATCH] [PATCH] remove redundant devices list Greg KH
2005-04-01 23:47 ` [PATCH] PCI busses are structs, not integers Greg KH
2005-04-01 23:47 ` [PATCH] pci_ids.h correction for Intel ICH7M Greg KH
2005-04-01 23:47 ` [PATCH] sort-out-pci_rom_address_enable-vs-ioresource_rom_enable.patch Greg KH
2005-04-01 23:47 ` [PATCH] arch/i386/pci/i386.c: Use new for_each_pci_dev macro Greg KH
2005-04-01 23:47 ` PCI Hotplug: enforce the rule that a hotplug slot needs a release function Greg KH
2005-04-01 23:47 ` [PATCH] PCI Hotplug: add documentation about release pointer Greg KH
2005-04-01 23:47 ` [PATCH] PCI: Quirk for Asus M5N Greg KH
2005-04-01 23:47 ` [PATCH] drivers/pci/hotplug/cpqphp_core.c: fix a check after use Greg KH
2005-04-01 23:47 ` [PATCH] PCI: shrink drivers/pci/proc.c::pci_seq_start() Greg KH
2005-04-01 23:47 ` [PATCH] PCI: handle multiple video cards on the same bus Greg KH
2005-04-01 23:47 ` [PATCH] PCI: remove pci_find_device usage from pci sysfs code Greg KH
2005-04-01 23:47 ` [PATCH] drivers/pci/msi.c: fix a check after use Greg KH
2005-04-01 23:47 ` PCI: clean up the dynamic id logic a little bit Greg KH
2005-04-01 23:47 ` [PATCH] PCI: create PCI_DEBUG config option to make it easier for users to enable pci debugging Greg KH
2005-04-02 12:20 ` [PATCH] PCI Hotplug: remove code duplication in drivers/pci/hotplug/ibmphp_pci.c Rolf Eike Beer
2005-04-02 19:26 ` Andrew Morton
2005-04-08 0:07 ` Greg KH
2005-04-08 7:02 ` Rolf Eike Beer
2005-04-02 1:10 ` PCI: fix an oops in some pci devices on hotplug remove when their resources are being freed Matthew Wilcox
2005-04-02 3:31 ` Greg KH [this message]
2005-04-02 3:53 ` Matthew Wilcox
2005-04-02 4:04 ` Greg KH
2005-04-04 20:11 ` PCI: increase the size of the pci.ids strings Giuseppe Bilotta
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