net/smc: Use a mutex for locking "struct smc_pnettable"
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.26 by commit 062772d5cc8cd4018585cdbc2c03457dfb5a3d88, it was introduced in version v5.1 by commit 64e28b52c7a6616217bee67ba2ad886f478f9737. For more details please see the references link.