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Date: Thu, 07 Aug 2008 17:43:01 +0900 From: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com> To: Alex Chiang <achiang@...com>, Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>, Matthew Wilcox <matthew@....cx>, Pierre Ossman <drzeus-list@...eus.cx>, Jesse Barnes <jbarnes@...tuousgeek.org>, LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org Subject: Re: [PATCH 0/7] Fixups for duplicate slot names Hi Alex-san, Thank you for patches! I looked at your patches and it looks good. But I have only one concern about how to allocate/free memory for slot name. With your change, memory region for slot name will be allocated by hotplug *controller* driver and it can be freed using kfree() by hotplug *core* driver (not hotplug controller driver). So all hotplug controller drivers including drivers implemented in the future need to take it into account. I think it will be more robust if we can allocate and free memory in the same component (maybe hotplug core driver in this case). Thanks, Kenji Kaneshige Alex Chiang wrote: > * Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>: >> With this change, kobject_init_and_add() called in >> pci_create_slot() will show stack trace if a hotplug driver >> attempts to register multiple slot with the same name. That is, >> stack trace will be shown on the platform that wrongly assing >> the physical slot number to multiple slots. I'm very sorry, but >> I don't have enough time to consider how to fix it today. > > Hello Kenji-san, > > You are obviously correct about my prior bad patch that simply > removed the check in pci_hp_register() for duplicate names. > > I also talked with Willy, and he thought that the proper way to > fix all these issues was not in the individual drivers, but in > the PCI core, which I agree with. > > Here is a patch series that attempts to implement Willy's > suggestion. > > Patches 1--6 convert the callers of pci_hp_register/pci_create_slot > from a static char name[] to a dynamically kmalloc'ed char *name. > > There are also cleanups in the individual drivers to remove the > _slot_with_bus parameters. > > Patch 7/7 implements the collision rename logic. It's not the > prettiest thing in the world, so your comments are welcome. :) > > It's getting late here and I haven't had time to really test it, > other than a quick compile test, but I wanted to try and send it > so that you could take a look and possibly try it. ;) > > These patches apply on top of Linus's latest tree. > > Thanks! > > /ac > > drivers/acpi/pci_slot.c | 15 ++++++- > drivers/pci/hotplug/acpiphp.h | 2 - > drivers/pci/hotplug/acpiphp_core.c | 18 +++++---- > drivers/pci/hotplug/fakephp.c | 16 ++++++-- > drivers/pci/hotplug/pci_hotplug_core.c | 4 -- > drivers/pci/hotplug/pciehp.h | 6 +-- > drivers/pci/hotplug/pciehp_core.c | 7 --- > drivers/pci/hotplug/pciehp_hpc.c | 19 ++++----- > drivers/pci/hotplug/pcihp_skeleton.c | 12 ++++-- > drivers/pci/hotplug/shpchp.h | 5 +- > drivers/pci/hotplug/shpchp_core.c | 29 ++++---------- > drivers/pci/slot.c | 65 +++++++++++++++++++++++++++++---- > include/linux/pci.h | 3 - > 13 files changed, 124 insertions(+), 77 deletions(-) > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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