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linux-stable/drivers/i2c
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Tam Nguyen 5a47c2fa0d i2c: designware: Handle invalid SMBus block data response length value 
commit 69f035c480 upstream.

In the I2C_FUNC_SMBUS_BLOCK_DATA case, the invalid length byte value
(outside of 1-32) of the SMBus block data response from the Slave device
is not correctly handled by the I2C Designware driver.

In case IC_EMPTYFIFO_HOLD_MASTER_EN==1, which cannot be detected
from the registers, the Master can be disabled only if the STOP bit
is set. Without STOP bit set, the Master remains active, holding the bus
until receiving a block data response length. This hangs the bus and
is unrecoverable.

Avoid this by issuing another dump read to reach the stop condition when
an invalid length byte is received.

Cc: stable@vger.kernel.org
Signed-off-by: Tam Nguyen <tamnguyenchi@os.amperecomputing.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20230726080001.337353-3-tamnguyenchi@os.amperecomputing.com
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-23 17:52:31 +02:00
..
algos
busses i2c: designware: Handle invalid SMBus block data response length value 2023-08-23 17:52:31 +02:00
muxes i2c: mux: reg: check return value after calling platform_get_resource() 2022-12-31 13:32:42 +01:00
i2c-boardinfo.c
i2c-core-acpi.c More ACPI updates for 6.1-rc1 2022-10-10 13:28:06 -07:00
i2c-core-base.c i2c: Restore initial power state if probe fails 2022-11-14 20:46:31 +01:00
i2c-core-of.c
i2c-core-slave.c i2c: add tracepoints for I2C slave events 2022-03-20 00:11:05 +01:00
i2c-core-smbus.c i2c: smbus: Check for parent device before dereference 2022-02-19 12:37:20 +01:00
i2c-core.h i2c: acpi: Use ACPI wake capability bit to set wake_irq 2022-10-04 15:41:12 +02:00
i2c-dev.c i2c: dev: Force case user pointers in compat_i2cdev_ioctl() 2022-04-15 23:30:59 +02:00
i2c-mux.c i2c: mux: harden i2c_mux_alloc() against integer overflows 2022-09-21 22:12:06 +02:00
i2c-slave-eeprom.c i2c: Make remove callback return void 2022-08-16 12:46:26 +02:00
i2c-slave-testunit.c i2c: Make remove callback return void 2022-08-16 12:46:26 +02:00
i2c-smbus.c i2c: Make remove callback return void 2022-08-16 12:46:26 +02:00
i2c-stub.c
Kconfig
Makefile