ptdma: pt_core_execute_cmd() should use spinlock

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ptdma: pt_core_execute_cmd() should use spinlock The interrupt handler (pt_core_irq_handler()) of the ptdma driver can be called from interrupt context. The code flow in this function can lead down to pt_core_execute_cmd() which will attempt to grab a mutex, which is not appropriate in interrupt context and ultimately leads to a kernel panic. The fix here changes this mutex to a spinlock, which has been verified to resolve the issue.

References

• https://git.kernel.org/stable/c/ed0d8f731e0bf1bb12a7a37698ac613db20e2794
• https://git.kernel.org/stable/c/13ba563c2c8055ba8a637c9f70bb833b43cb4207
• https://git.kernel.org/stable/c/95e5fda3b5f9ed8239b145da3fa01e641cf5d53c