Commits on Mar 7, 2021

1. net: dns: update k_work API and fix misuse …

   Cancelling an in-progress work item is not guaranteed to complete
   synchronously.  Convert the DNS timeout to use the new delayable work
   structure, and use its handler to release the query slot for use in
   subsequent operations.
   
   This delays the release of the query slot but avoids some race
   conditions.
   
   Allocation of slots remains racy as the mixed identification of query
   slots through pointers and indexes, and the use of a null check for a
   function pointer (not compatible with the atomic_ptr API) as the
   in-use condition, makes it difficult to switch to a thread-safe
   request/release interface.
   
   Signed-off-by: Peter Bigot <[email protected]>

   

   pabigot committed Mar 7, 2021
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