tmp_suning_uos_patched/drivers/pci
Inaky Perez-Gonzalez bae94d0237 PCI: switch pci_{enable,disable}_device() to be nestable
Changes the pci_{enable,disable}_device() functions to work in a
nested basis, so that eg, three calls to enable_device() require three
calls to disable_device().

The reason for this is to simplify PCI drivers for
multi-interface/capability devices. These are devices that cram more
than one interface in a single function. A relevant example of that is
the Wireless [USB] Host Controller Interface (similar to EHCI) [see
http://www.intel.com/technology/comms/wusb/whci.htm]. 

In these kind of devices, multiple interfaces are accessed through a
single bar and IRQ line. For that, the drivers map only the smallest
area of the bar to access their register banks and use shared IRQ
handlers. 

However, because the order at which those drivers load cannot be known
ahead of time, the sequence in which the calls to pci_enable_device()
and pci_disable_device() cannot be predicted. Thus:

1. driverA     starts     pci_enable_device()
2. driverB     starts     pci_enable_device()
3. driverA     shutdown   pci_disable_device()
4. driverB     shutdown   pci_disable_device()

between steps 3 and 4, driver B would loose access to it's device,
even if it didn't intend to.

By using this modification, the device won't be disabled until all the
callers to enable() have called disable().

This is implemented by replacing 'struct pci_dev->is_enabled' from a
bitfield to an atomic use count. Each caller to enable increments it,
each caller to disable decrements it. When the count increments from 0
to 1, __pci_enable_device() is called to actually enable the
device. When it drops to zero, pci_disable_device() actually does the
disabling.

We keep the backend __pci_enable_device() for pci_default_resume() to
use and also change the sysfs method implementation, so that userspace
enabling/disabling the device doesn't disable it one time too much.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-12-01 14:36:59 -08:00
..
hotplug acpiphp: fix missing acpiphp_glue_exit() 2006-12-01 14:36:58 -08:00
pcie PCI: fix pcie_portdrv_restore_config undefined without CONFIG_PM error 2006-10-18 11:36:11 -07:00
.gitignore Add some basic .gitignore files 2005-10-18 08:26:15 -07:00
access.c PCI: Block on access to temporarily unavailable pci device 2006-12-01 14:36:58 -08:00
bus.c PCI: fix __must_check warnings 2006-09-26 17:43:53 -07:00
hotplug.c [PATCH] driver core: replace "hotplug" by "uevent" 2006-01-04 16:18:08 -08:00
htirq.c [PATCH] htirq: allow buggy drivers of buggy hardware to write the registers 2006-11-08 18:29:25 -08:00
Kconfig PCI: Let PCI_MULTITHREAD_PROBE not be broken 2006-12-01 14:36:55 -08:00
Makefile [PATCH] htirq: tidy up the htirq code 2006-10-04 07:55:30 -07:00
msi.c PCI: Improve pci_msi_supported() comments 2006-10-18 11:36:11 -07:00
msi.h PCI: Make some MSI-X #defines generic 2006-12-01 14:36:56 -08:00
pci-acpi.c pci: clear osc support flags if no _OSC method 2006-12-01 14:36:58 -08:00
pci-driver.c PCI: switch pci_{enable,disable}_device() to be nestable 2006-12-01 14:36:59 -08:00
pci-sysfs.c PCI: switch pci_{enable,disable}_device() to be nestable 2006-12-01 14:36:59 -08:00
pci.c PCI: switch pci_{enable,disable}_device() to be nestable 2006-12-01 14:36:59 -08:00
pci.h PCI: switch pci_{enable,disable}_device() to be nestable 2006-12-01 14:36:59 -08:00
probe.c PCI: quirks: fix the festering mess that claims to handle IDE quirks 2006-12-01 14:36:56 -08:00
proc.c [PATCH] 64bit resource: change pci core and arch code to use resource_size_t 2006-06-27 09:24:00 -07:00
quirks.c PCI: quirks: fix the festering mess that claims to handle IDE quirks 2006-12-01 14:36:56 -08:00
remove.c PCI: add pci_stop_bus_device 2006-09-26 17:43:54 -07:00
rom.c Altix: Initial ACPI support - ROM shadowing. 2006-12-01 14:36:58 -08:00
search.c pci: Additional search functions 2006-10-18 11:36:12 -07:00
setup-bus.c [PATCH] fix "PCI: assign ioapic resource at hotplug" 2006-10-04 07:55:14 -07:00
setup-irq.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup-res.c [PATCH] 64bit resource: change pci core and arch code to use resource_size_t 2006-06-27 09:24:00 -07:00
syscall.c [PATCH] PCI: Block config access during BIST 2005-10-28 15:36:58 -07:00