CVE ID:	CVE-2024-26846
Description:	In the Linux kernel, the following vulnerability has been resolved: nvme-fc: do not wait in vain when unloading module The module exit path has race between deleting all controllers and freeing 'left over IDs'. To prevent double free a synchronization between nvme_delete_ctrl and ida_destroy has been added by the initial commit. There is some logic around trying to prevent from hanging forever in wait_for_completion, though it does not handling all cases. E.g. blktests is able to reproduce the situation where the module unload hangs forever. If we completely rely on the cleanup code executed from the nvme_delete_ctrl path, all IDs will be freed eventually. This makes calling ida_destroy unnecessary. We only have to ensure that all nvme_delete_ctrl code has been executed before we leave nvme_fc_exit_module. This is done by flushing the nvme_delete_wq workqueue. While at it, remove the unused nvme_fc_wq workqueue too.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2024-26846 https://git.kernel.org/stable/c/085195aa90a924c79e35569bcdad860d764a8e17 https://git.kernel.org/stable/c/085195aa90a924c79e35569bcdad860d764a8e17 https://git.kernel.org/stable/c/0bf567d6d9ffe09e059bbdfb4d07143cef42c75c https://git.kernel.org/stable/c/0bf567d6d9ffe09e059bbdfb4d07143cef42c75c https://git.kernel.org/stable/c/4f2c95015ec2a1899161be6c0bdaecedd5a7bfb2 https://git.kernel.org/stable/c/4f2c95015ec2a1899161be6c0bdaecedd5a7bfb2 https://git.kernel.org/stable/c/70fbfc47a392b98e5f8dba70c6efc6839205c982 https://git.kernel.org/stable/c/70fbfc47a392b98e5f8dba70c6efc6839205c982 https://git.kernel.org/stable/c/baa6b7eb8c66486bd64608adc63fe03b30d3c0b9 https://git.kernel.org/stable/c/baa6b7eb8c66486bd64608adc63fe03b30d3c0b9 https://git.kernel.org/stable/c/c0882c366418bf9c19e1ba7f270fe377a9bf5d67 https://git.kernel.org/stable/c/c0882c366418bf9c19e1ba7f270fe377a9bf5d67