WSL2-Linux-Kernel/drivers/base
Thomas Gleixner 77e89afc25 PCI/MSI: Protect msi_desc::masked for multi-MSI
Multi-MSI uses a single MSI descriptor and there is a single mask register
when the device supports per vector masking. To avoid reading back the mask
register the value is cached in the MSI descriptor and updates are done by
clearing and setting bits in the cache and writing it to the device.

But nothing protects msi_desc::masked and the mask register from being
modified concurrently on two different CPUs for two different Linux
interrupts which belong to the same multi-MSI descriptor.

Add a lock to struct device and protect any operation on the mask and the
mask register with it.

This makes the update of msi_desc::masked unconditional, but there is no
place which requires a modification of the hardware register without
updating the masked cache.

msi_mask_irq() is now an empty wrapper which will be cleaned up in follow
up changes.

The problem goes way back to the initial support of multi-MSI, but picking
the commit which introduced the mask cache is a valid cut off point
(2.6.30).

Fixes: f2440d9acb ("PCI MSI: Refactor interrupt masking code")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210729222542.726833414@linutronix.de
2021-08-10 10:59:20 +02:00
..
firmware_loader firmware_loader: fix use-after-free in firmware_fallback_sysfs 2021-07-29 17:22:15 +02:00
power Merge branches 'pm-cpuidle', 'pm-sleep' and 'pm-domains' 2021-07-07 20:17:43 +02:00
regmap regmap: mdio: Reject invalid addresses 2021-06-14 15:00:29 +01:00
test device property: Remove some casts in property-entry-test 2021-06-23 16:37:21 -06:00
Kconfig RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
Makefile devres: Enable trace events 2021-06-15 17:14:36 +02:00
arch_numa.c
arch_topology.c arch_topology: Avoid use-after-free for scale_freq_data 2021-07-01 07:32:14 +05:30
attribute_container.c driver core: attribute_container: fix W=1 warnings 2021-05-14 13:37:10 +02:00
auxiliary.c driver core: auxiliary bus: Fix memory leak when driver_register() fail 2021-07-21 16:36:06 +02:00
base.h driver core: Export device_driver_attach() 2021-06-21 15:29:24 -06:00
bus.c driver core: Flow the return code from ->probe() through to sysfs bind 2021-06-21 15:29:24 -06:00
cacheinfo.c
class.c
component.c component: Rename 'dev' to 'parent' 2021-05-27 15:49:59 +02:00
container.c
core.c PCI/MSI: Protect msi_desc::masked for multi-MSI 2021-08-10 10:59:20 +02:00
cpu.c drivers/base: Constify static attribute_group structs 2021-06-04 15:06:28 +02:00
dd.c drivers core: Fix oops when driver probe fails 2021-07-27 14:44:43 +02:00
devcoredump.c devcoredump: remove contact information 2021-06-04 15:05:44 +02:00
devres.c devres: Enable trace events 2021-06-15 17:14:36 +02:00
devtmpfs.c devtmpfs: actually reclaim some init memory 2021-03-23 14:57:35 +01:00
driver.c
firmware.c
hypervisor.c
init.c
isa.c
map.c
memory.c Linux 5.13-rc6 2021-06-14 09:07:45 +02:00
module.c
node.c Driver core changes for 5.14-rc1 2021-07-05 13:51:41 -07:00
pinctrl.c
platform-msi.c platform-msi: fix kernel-doc warnings 2021-04-02 16:40:08 +02:00
platform.c drivers/base: Constify static attribute_group structs 2021-06-04 15:06:28 +02:00
property.c Driver core changes for 5.14-rc1 2021-07-05 13:51:41 -07:00
soc.c
swnode.c software node: Handle software node injection to an existing device properly 2021-06-23 19:34:58 +02:00
syscore.c
topology.c
trace.c devres: Enable trace events 2021-06-15 17:14:36 +02:00
trace.h devres: Enable trace events 2021-06-15 17:14:36 +02:00
transport_class.c