>From 57a28ee5e7662ca28ba4c793aa037d64bd082dee Mon Sep 17 00:00:00 2001 From: Feng Tang <feng.tang@xxxxxxxxx> Date: Wed, 22 Aug 2012 15:41:51 +0800 Subject: [PATCH 1/2] PCI: Use local parameter pci_device_id for pci_get_subsys/class() This fixes a kernel warning https://lkml.org/lkml/2012/7/31/682 pci_get_subsys() may get called in late system reboot stage, using a sleepable kmalloc() sounds fragile and will casue a kernel warning with my recent commmit 55c844a "x86/reboot: Fix a warning message triggered by stop_other_cpus()" which disable local interrupt in late system shutdown/reboot phase. Using a local parameter instead will fix it and make it eligible for calling forom atomic context. Do the same change for the pci_get_class() as suggeted by Bjorn Helgaas Bisected-by: Fengguang Wu <fengguang.wu@xxxxxxxxx> Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx> Reviewed-by: Fengguang Wu <fengguang.wu@xxxxxxxxx> --- drivers/pci/search.c | 35 +++++++++++------------------------ 1 files changed, 11 insertions(+), 24 deletions(-) diff --git a/drivers/pci/search.c b/drivers/pci/search.c index 993d4a0..78a08b1 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -245,8 +245,7 @@ struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device, unsigned int ss_vendor, unsigned int ss_device, struct pci_dev *from) { - struct pci_dev *pdev; - struct pci_device_id *id; + struct pci_device_id id; /* * pci_find_subsys() can be called on the ide_setup() path, @@ -257,18 +256,12 @@ struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device, if (unlikely(no_pci_devices())) return NULL; - id = kzalloc(sizeof(*id), GFP_KERNEL); - if (!id) - return NULL; - id->vendor = vendor; - id->device = device; - id->subvendor = ss_vendor; - id->subdevice = ss_device; - - pdev = pci_get_dev_by_id(id, from); - kfree(id); + id.vendor = vendor; + id.device = device; + id.subvendor = ss_vendor; + id.subdevice = ss_device; - return pdev; + return pci_get_dev_by_id(&id, from); } /** @@ -307,19 +300,13 @@ pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from) */ struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) { - struct pci_dev *dev; - struct pci_device_id *id; + struct pci_device_id id; - id = kzalloc(sizeof(*id), GFP_KERNEL); - if (!id) - return NULL; - id->vendor = id->device = id->subvendor = id->subdevice = PCI_ANY_ID; - id->class_mask = PCI_ANY_ID; - id->class = class; + id.vendor = id.device = id.subvendor = id.subdevice = PCI_ANY_ID; + id.class_mask = PCI_ANY_ID; + id.class = class; - dev = pci_get_dev_by_id(id, from); - kfree(id); - return dev; + return pci_get_dev_by_id(&id, from); } /** -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
