OpenCloudOS-Kernel/drivers/pci
Rafael J. Wysocki ebfc5b802f PCI: Fix regression in pci_restore_state(), v3
Commit 26f41062f2 ("PCI: check for pci bar restore completion and
retry") attempted to address problems with PCI BAR restoration on
systems where FLR had not been completed before pci_restore_state() was
called, but it did that in an utterly wrong way.

First off, instead of retrying the writes for the BAR registers only, it
did that for all of the PCI config space of the device, including the
status register (whose value after the write quite obviously need not be
the same as the written one).  Second, it added arbitrary delay to
pci_restore_state() even for systems where the PCI config space
restoration was successful at first attempt.  Finally, the mdelay(10) it
added to every iteration of the writing loop was way too much of a delay
for any reasonable device.

All of this actually caused resume failures for some devices on Mikko's
system.

To fix the regression, make pci_restore_state() only retry the writes
for BAR registers and only wait if the first read from the register
doesn't return the written value.  Additionaly, make it wait for 1 ms,
instead of 10 ms, after every failing attempt to write into config
space.

Reported-by: Mikko Vinni <mmvinni@yahoo.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-15 13:06:29 -07:00
..
hotplug PCI: make acpihp use __pci_remove_bus_device instead 2012-02-27 12:17:16 -08:00
pcie ASPM: Fix pcie devices with non-pcie children 2012-03-31 12:49:56 -07:00
.gitignore
Kconfig PCI: add a PCI resource reallocation config option 2012-02-24 09:38:59 -08:00
Makefile PCI: Move ATS implementation into own file 2011-10-14 09:05:33 -07:00
access.c PCI: Introduce INTx check & mask API 2012-01-06 12:10:34 -08:00
ats.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
bus.c PCI: add struct pci_host_bridge_window with CPU/bus address offset 2012-02-23 20:19:00 -07:00
hotplug-pci.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
hotplug.c
htirq.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
ioapic.c pci, x86/io-apic: Allow PCI_IOAPIC to be user configurable on x86 2011-12-06 09:21:05 +01:00
iov.c PCI: Rename pci_remove_bus_device to pci_stop_and_remove_bus_device 2012-02-27 12:12:18 -08:00
irq.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
msi.c x86/PCI: Expand the x86_msi_ops to have a restore MSIs. 2012-01-06 14:02:26 -08:00
msi.h PCI: MSI: Move MSI-X entry definition to pci_regs.h 2010-12-23 12:53:07 -08:00
of.c PCI: OF: Don't crash when bridge parent is NULL. 2011-08-19 08:51:37 -07:00
pci-acpi.c ACPI, PCI: Move acpi_dev_run_wake() to ACPI core 2012-03-30 02:21:18 -04:00
pci-driver.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-03-23 14:02:12 -07:00
pci-label.c switch ->is_visible() to returning umode_t 2012-01-03 22:54:55 -05:00
pci-stub.c PCI: pci-stub: ignore zero-length id parameters 2010-12-23 12:53:52 -08:00
pci-sysfs.c PCI: Rename pci_remove_bus_device to pci_stop_and_remove_bus_device 2012-02-27 12:12:18 -08:00
pci.c PCI: Fix regression in pci_restore_state(), v3 2012-04-15 13:06:29 -07:00
pci.h PCI: Move "pci reassigndev resource alignment" out of quirks.c 2012-02-24 14:37:26 -08:00
probe.c PCI: fix bridge I/O window bus-to-resource conversion 2012-03-20 10:41:27 -07:00
proc.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
quirks.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-03-23 14:02:12 -07:00
remove.c PCI: export __pci_remove_bus_device 2012-02-27 12:16:55 -08:00
rom.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
search.c PCI: use for_each_pci_dev() 2010-07-30 09:47:22 -07:00
setup-bus.c Merge branch 'pci-next+probe_only+bus2res-fb127cb' of git://github.com/bjorn-helgaas/linux into linux-next 2012-02-24 14:25:33 -08:00
setup-irq.c PCI: Make the struct pci_dev * argument of pci_fixup_irqs const. 2011-07-22 08:26:06 -07:00
setup-res.c PCI: Move "pci reassigndev resource alignment" out of quirks.c 2012-02-24 14:37:26 -08:00
slot.c pci: add module.h to files implicitly relying on its presence. 2011-10-31 19:31:23 -04:00
syscall.c headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
vpd.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
xen-pcifront.c Two fixes for regressions: 2012-04-06 17:54:53 -07:00