PCI: switchtec: Fix stdev_release() crash after surprise hot remove

In the Linux kernel, the following vulnerability has been resolved:

PCI: switchtec: Fix stdev_release() crash after surprise hot remove

A PCI device hot removal may occur while stdev->cdev is held open. The call

to stdev_release() then happens during close or exit, at a point way past

switchtec_pci_remove(). Otherwise the last ref would vanish with the

trailing put_device(), just before return.

At that later point in time, the devm cleanup has already removed the

stdev->mmio_mrpc mapping. Also, the stdev->pdev reference was not a counted

one. Therefore, in DMA mode, the iowrite32() in stdev_release() will cause

a fatal page fault, and the subsequent dma_free_coherent(), if reached,

would pass a stale &stdev->pdev->dev pointer.

Fix by moving MRPC DMA shutdown into switchtec_pci_remove(), after

stdev_kill(). Counting the stdev->pdev ref is now optional, but may prevent

future accidents.

Reproducible via the script at

https://lore.kernel.org/r/[email protected]