netdevsim: move max vf config to dev
max_vfs is a strange little beast because the file hangs off of nsim's debugfs, but it configures a field in the bus device. Move it to dev.c, let's look at it as if the device driver was imposing VF limit based on FW info (like pci_sriov_set_totalvfs()). Again, when moving refactor the function not to hold the vfs lock pointlessly while parsing the input. Wrap the access from the read side in READ_ONCE() to appease concurrency checkers. Do not check if return value from snprintf() is negative... Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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