[Bug 99301] socket shutdown of L2CAP ERTM channel causes hung tasks when S or I frame ACK is pending

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https://bugzilla.kernel.org/show_bug.cgi?id=99301

--- Comment #3 from Dean Jenkins <Dean_Jenkins@xxxxxxxxxx> ---
Created attachment 178551
  --> https://bugzilla.kernel.org/attachment.cgi?id=178551&action=edit
Uses hold and put functions to protect sk and chan structures based on 3.18.14
(RPi)

This patch improves the solution by preventing sk and chan structures from
being freed during the execution of l2cap_sock_shutdown().

However, the conn structure is at potential risk of freeing from
l2cap_conn_del() which needs further analysis.

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