Skip to main content

Browse the archive

https://github.com/torvalds/linux
05 April 2024, 19:05:47 UTC
Revision 9e8ce4b96b781b003e3174fbbc62e1d4388c8b8f authored by Rafael J. Wysocki on 20 March 2015, 13:56:19 UTC, committed by Rafael J. Wysocki on 20 March 2015, 13:56:19 UTC 
Revert "x86/PCI: Refine the way to release PCI IRQ resources"
 
Commit b4b55cda5874 (Refine the way to release PCI IRQ resources)
introduced a regression in the PCI IRQ resource management by causing
the IRQ resource of a device, established when pci_enabled_device()
is called on a fully disabled device, to be released when the driver
is unbound from the device, regardless of the enable_cnt.

This leads to the situation that an ill-behaved driver can now make a
device unusable to subsequent drivers by an imbalance in their use of
pci_enable/disable_device().  That is a serious problem for secondary
drivers like vfio-pci, which are innocent of the transgressions of
the previous driver.

Since the solution of this problem is not immediate and requires
further discussion, revert commit b4b55cda5874 and the issue it was
supposed to address (a bug related to xen-pciback) will be taken
care of in a different way going forward.

Reported-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent 06e5801
History
Tip revision: 9e8ce4b96b781b003e3174fbbc62e1d4388c8b8f authored by Rafael J. Wysocki on 20 March 2015, 13:56:19 UTC
Revert "x86/PCI: Refine the way to release PCI IRQ resources"
Tip revision: 9e8ce4b
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 1.2 KB
.mailmap -rw-r--r-- 4.9 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 94.0 KB
Kbuild -rw-r--r-- 2.1 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 298.6 KB
Makefile -rw-r--r-- 53.3 KB
README -rw-r--r-- 18.3 KB
REPORTING-BUGS -rw-r--r-- 7.3 KB

README

back to top