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The sk_prot is irda's own set of protocol handlers, so irda should statically know what that function is anyway, without using an indirect pointer. And as it happens, we know *exactly* what that pointer is statically: it's NULL, because irda doesn't define a disconnect operation. So calling that function is doubly wrong, and will just cause an oops. Reported-by: Martin Lang <[email protected]> Cc: Samuel Ortiz <[email protected]> Cc: David Miller <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>