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Filename Latest commit message Latest commit date
Radim Pavlik c0b70153f1 pinctrl: mcp23s08: fix race condition in irq handler 
[ Upstream commit 897120d41e7afd9da435cb00041a142aeeb53c07 ]

Checking value of MCP_INTF in mcp23s08_irq suggests that the handler may be
called even when there is no interrupt pending.

But the actual interrupt could happened between reading MCP_INTF and MCP_GPIO.
In this situation we got nothing from MCP_INTF, but the event gets acknowledged
on the expander by reading MCP_GPIO. This leads to losing events.

Fix the problem by not reading any register until we see something in MCP_INTF.

The error was reproduced and fix tested on MCP23017.

Signed-off-by: Radim Pavlik <radim.pavlik@tbs-biometrics.com>
Link: https://lore.kernel.org/r/AM7PR06MB6769E1183F68DEBB252F665ABA3E9@AM7PR06MB6769.eurprd06.prod.outlook.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-07-19 08:53:09 +02:00
arch hugetlb: clear huge pte during flush function on mips platform 2021-07-19 08:53:08 +02:00
block blk-wbt: make sure throttle is enabled properly 2021-07-14 16:53:25 +02:00
certs
crypto
Documentation clocksource: Retry clock read if long delays detected 2021-07-14 16:53:18 +02:00
drivers pinctrl: mcp23s08: fix race condition in irq handler 2021-07-19 08:53:09 +02:00
fs udf: Fix NULL pointer dereference in udf_symlink function 2021-07-19 08:53:08 +02:00
include block: return the correct bvec when checking for gaps 2021-07-14 16:53:48 +02:00
init
ipc
kernel rcu: Invoke rcu_spawn_core_kthreads() from rcu_spawn_gp_kthread() 2021-07-14 16:53:36 +02:00
lib
LICENSES
mm mm/z3fold: fix potential memory leak in z3fold_destroy_pool() 2021-07-14 16:53:47 +02:00
net ipv6: use prandom_u32() for ID generation 2021-07-19 08:53:09 +02:00
samples samples/bpf: Fix the error return code of xdp_redirect's main() 2021-07-14 16:53:30 +02:00
scripts kbuild: Fix objtool dependency for 'OBJECT_FILES_NON_STANDARD_<obj> := n' 2021-07-14 16:53:20 +02:00
security evm: fix writing <securityfs>/evm overflow 2021-07-14 16:53:21 +02:00
sound ASoC: atmel-i2s: Fix usage of capture and playback at the same time 2021-07-14 16:53:46 +02:00
tools perf llvm: Return -ENOMEM when asprintf() fails 2021-07-14 16:53:48 +02:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
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COPYING
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Kbuild
Kconfig
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Makefile Linux 5.4.132 2021-07-14 16:53:49 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.