CVE-2024-26806

In the Linux kernel, the following vulnerability has been resolved: spi:
cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks
The ->runtime_suspend() and ->runtime_resume() callbacks are not expected
to call spi_controller_suspend() and spi_controller_resume(). Remove calls
to those in the cadence-qspi driver. Those helpers have two roles
currently: - They stop/start the queue, including dealing with the kworker.

• They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It requires
  acquiring ctlr->bus_lock_mutex. Step one is irrelevant because cadence-qspi
  is not queued. Step two however has two implications: - A deadlock occurs,
  because ->runtime_resume() is called in a context where the lock is already
  taken (in the ->exec_op() callback, where the usage count is incremented).
• It would disallow all operations once the device is auto-suspended. Here
  is a brief call tree highlighting the mutex deadlock: spi_mem_exec_op() …
  spi_mem_access_start() mutex_lock(&ctlr->bus_lock_mutex)
  cqspi_exec_mem_op() pm_runtime_resume_and_get() cqspi_resume()
  spi_controller_resume() mutex_lock(&ctlr->bus_lock_mutex) …
  spi_mem_access_end() mutex_unlock(&ctlr->bus_lock_mutex) …