From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rajesh Shah Date: Fri, 18 Mar 2005 22:07:06 +0000 Subject: [patch 05/12] Take the PCI lock when modifying pci bus or device lists Message-Id: <20050318140706.E1145@unix-os.sc.intel.com> List-Id: References: <20050318133856.A878@unix-os.sc.intel.com> In-Reply-To: <20050318133856.A878-39QZ/XbsZ5/mO6KZMuUCQVaTQe2KTcn/@public.gmane.org>; from rajesh.shah-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org on Fri, Mar 18, 2005 at 01:38:57PM -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: gregkh-l3A5Bk7waGM@public.gmane.org, tony.luck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Cc: linux-pci-jyMamyUUXNJG4ohzP4jBZS1Fcj925eT/@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, pcihpd-discuss-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-ia64-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org With root bridge and pci bridge hot-plug, new buses and devices can be added or removed at run time. Protect the pci bus and device lists with the pci lock when doing so. Signed-off-by: Rajesh Shah --- linux-2.6.11-mm4-iohp-rshah1/drivers/pci/probe.c | 12 +++++++++++- 1 files changed, 11 insertions(+), 1 deletion(-) diff -puN drivers/pci/probe.c~lock-pci-root-bus-add drivers/pci/probe.c --- linux-2.6.11-mm4-iohp/drivers/pci/probe.c~lock-pci-root-bus-add 2005-03-16 13:07:14.694663612 -0800 +++ linux-2.6.11-mm4-iohp-rshah1/drivers/pci/probe.c 2005-03-16 13:07:14.802085486 -0800 @@ -8,6 +8,7 @@ #include #include #include +#include "pci.h" #undef DEBUG @@ -380,8 +381,11 @@ struct pci_bus * __devinit pci_add_new_b struct pci_bus *child; child = pci_alloc_child_bus(parent, dev, busnr); - if (child) + if (child) { + spin_lock(&pci_bus_lock); list_add_tail(&child->node, &parent->children); + spin_unlock(&pci_bus_lock); + } return child; } @@ -771,7 +775,9 @@ pci_scan_single_device(struct pci_bus *b * and the bus list for fixup functions, etc. */ INIT_LIST_HEAD(&dev->global_list); + spin_lock(&pci_bus_lock); list_add_tail(&dev->bus_list, &bus->devices); + spin_unlock(&pci_bus_lock); return dev; } @@ -891,7 +897,9 @@ struct pci_bus * __devinit pci_scan_bus_ DBG("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus); goto err_out; } + spin_lock(&pci_bus_lock); list_add_tail(&b->node, &pci_root_buses); + spin_unlock(&pci_bus_lock); memset(dev, 0, sizeof(*dev)); dev->parent = parent; @@ -933,7 +941,9 @@ class_dev_create_file_err: class_dev_reg_err: device_unregister(dev); dev_reg_err: + spin_lock(&pci_bus_lock); list_del(&b->node); + spin_unlock(&pci_bus_lock); err_out: kfree(dev); kfree(b); _