Linux Kernel Runtime Power Management Underflow Vulnerability in DMA Engine

A vulnerability in the Linux kernel's DMA engine for Qualcomm BAM (Broadband Access Module) has been addressed. The issue arose from unbalanced power management calls when BAM was controlled remotely, following a previous commit that introduced a check for runtime power management. The latest fix reverts this change, ensuring that power management is consistently enabled, while also streamlining the code by removing unnecessary checks for null clock references.

Impact

Exploitation of this vulnerability could lead to improper power management, potentially causing performance issues or increased power consumption.