Wolfram Sang 9153e0d437 i2c: rcar: avoid race when unregistering slave ... [ Upstream commit c7c9e914f9 ] Due to the lockless design of the driver, it is theoretically possible to access a NULL pointer, if a slave interrupt was running while we were unregistering the slave. To make this rock solid, disable the interrupt for a short time while we are clearing the interrupt_enable register. This patch is purely based on code inspection. The OOPS is super-hard to trigger because clearing SAR (the address) makes interrupts even more unlikely to happen as well. While here, reinit SCR to SDBS because this bit should always be set according to documentation. There is no effect, though, because the interface is disabled. Fixes: 7b814d852a ("i2c: rcar: avoid race when unregistering slave client") Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-08-21 13:05:34 +02:00
..
algos	i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665	2020-07-09 09:37:54 +02:00
busses	i2c: rcar: avoid race when unregistering slave	2020-08-21 13:05:34 +02:00
muxes	i2c: mux: demux-pinctrl: Fix an error handling path in 'i2c_demux_pinctrl_probe()'	2020-05-27 17:46:18 +02:00
Kconfig	docs: i2c: convert to ReST and add to driver-api bookset	2019-07-31 13:25:27 -06:00
Makefile	i2c: don't use any __deprecated handling anymore	2018-08-24 17:26:43 +02:00
i2c-boardinfo.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00
i2c-core-acpi.c	i2c: acpi: put device when verifying client fails	2020-03-18 07:17:58 +01:00
i2c-core-base.c	i2c: fix missing pm_runtime_put_sync in i2c_device_probe	2020-05-27 17:46:15 +02:00
i2c-core-of.c	i2c: core: fix use after free in of_i2c_notify	2019-11-15 22:01:13 +01:00
i2c-core-slave.c	i2c: slave: add sanity check when unregistering	2020-08-11 15:33:37 +02:00
i2c-core-smbus.c	i2c: core: check returned size of emulated smbus block read	2020-06-30 15:37:02 -04:00
i2c-core.h	Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2019-07-15 21:10:39 -07:00
i2c-dev.c	i2c: dev: Fix the race between the release of i2c_dev and cdev	2020-05-27 17:46:07 +02:00
i2c-mux.c	i2c: mux: add sysfs header	2019-06-22 07:32:33 +02:00
i2c-slave-eeprom.c	i2c: slave-eeprom: Add read only mode	2019-09-28 20:44:12 +02:00
i2c-smbus.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00
i2c-stub.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00