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Commit 2c1f56ac authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/feng-avoid-kmalloc' into next 

* pci/feng-avoid-kmalloc:
  PCI: Remove the obsolete no_pci_devices() check
  PCI: Use pci_device_id on stack for pci_get_subsys/class() to avoid kmalloc
parents be017b25 e9bf1040

drivers/pci/search.c

+18 −37
Original line number Diff line number Diff line
@@ -243,30 +243,14 @@ 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;



	/*

	 * pci_find_subsys() can be called on the ide_setup() path,

	 * super-early in boot.  But the down_read() will enable local

	 * interrupts, which can cause some machines to crash.  So here we

	 * detect and flag that situation and bail out early.

	 */

	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);



	return pdev;

	struct pci_device_id id = {

		.vendor = vendor,

		.device = device,

		.subvendor = ss_vendor,

		.subdevice = ss_device,

	};



	return pci_get_dev_by_id(&id, from);

}



/**
@@ -305,19 +289,16 @@ 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;



	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;



	dev = pci_get_dev_by_id(id, from);

	kfree(id);

	return dev;

	struct pci_device_id id = {

		.vendor = PCI_ANY_ID,

		.device = PCI_ANY_ID,

		.subvendor = PCI_ANY_ID,

		.subdevice = PCI_ANY_ID,

		.class_mask = PCI_ANY_ID,

		.class = class,

	};



	return pci_get_dev_by_id(&id, from);

}



/**