i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue

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commit 4caf4cb1ea upstream.

iproc_i2c_rd_reg() and iproc_i2c_wr_reg() are called from both
interrupt context (e.g. bcm_iproc_i2c_isr) and process context
(e.g. bcm_iproc_i2c_suspend). Therefore, interrupts should be
disabled to avoid potential deadlock. To prevent this scenario,
use spin_lock_irqsave().

Fixes: 9a10387280 ("i2c: iproc: add NIC I2C support")
Signed-off-by: Chengfeng Ye <dg573847474@gmail.com>
Acked-by: Ray Jui <ray.jui@broadcom.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>

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Chengfeng Ye 2023-07-07 08:49:41 +00:00 • committed by Greg Kroah-Hartman

parent b99f490ea8

commit c4e671dae5

1 changed files with 7 additions and 4 deletions

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drivers/i2c/busses/i2c-bcm-iproc.c

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