i2c: designware: Disable SMBus interrupts to prevent storms from mis-configured firmware

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[ Upstream commit d3429178ee ]

When probing the I2C master, disable SMBus interrupts to prevent
storms caused by broken firmware mis-configuring IC_SMBUS=1; the
handler never services them and a mis-configured SMBUS Master
extend-clock timeout or SMBUS Slave extend-clock timeout can
flood the CPU.

Signed-off-by: Jinhui Guo <guojinhui.liam@bytedance.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20251021075714.3712-2-guojinhui.liam@bytedance.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Jinhui Guo 2025-10-21 15:57:14 +08:00 • committed by Greg Kroah-Hartman

parent 7b85814424

commit ef7653481a

2 changed files with 8 additions and 0 deletions

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1

drivers/i2c/busses/i2c-designware-core.h

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7

drivers/i2c/busses/i2c-designware-master.c

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