firmware: qcom: scm: Mark get_wq_ctx() as atomic call

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: scm: Mark get_wq_ctx() as atomic call Currently get_wq_ctx() is wrongly configured as a standard call. When two SMC calls are in sleep and one SMC wakes up, it calls get_wq_ctx() to resume the corresponding sleeping thread. But if get_wq_ctx() is interrupted, goes to sleep and another SMC call is waiting to be allocated a waitq context, it leads to a deadlock. To avoid this get_wq_ctx() must be an atomic call and can't be a standard SMC call. Hence mark get_wq_ctx() as a fast call.

References

• https://git.kernel.org/stable/c/cdf7efe4b02aa93813db0bf1ca596ad298ab6b06
• https://git.kernel.org/stable/c/e40115c33c0d79c940545b6b12112aace7acd9f5
• https://git.kernel.org/stable/c/9960085a3a82c58d3323c1c20b991db6045063b0