The Linux kernel Realtek DSA driver used gpiod_set_value() for reset GPIO operations in rtl83xx_reset_assert() and rtl83xx_reset_deassert(), which are called only during probe paths that may sleep. Using gpiod_set_value() with sleeping GPIO controllers like I2C I/O expanders triggers kernel warnings. The vulnerability was addressed by switching to gpiod_set_value_cansleep(), which safely handles sleeping GPIO controllers. This patch applies to kernels version 6.9 and later, as the affected helper functions were introduced in v6.9. Older stable kernels require similar changes at their respective call sites.

The impact is primarily related to kernel stability and warning suppression during device probing involving reset GPIOs managed by sleeping controllers. There is no indication of direct security compromise or exploitation. The issue could cause kernel warnings and potentially affect device initialization reliability.

A fix is available and has been applied to Linux kernel versions 6.9 and later by replacing gpiod_set_value() with gpiod_set_value_cansleep() in the affected reset helper functions. Older stable kernels require backporting this change at the corresponding code locations. Users should update to a patched kernel version to resolve this issue.