[PATCH v2] powerpc/pseries/vas: Hold mmap_mutex after mmap lock during window close

[Michael Ellerman]

On Sun, 16 Jul 2023 03:05:06 -0700, Haren Myneni wrote:
> Commit 8ef7b9e1765a ("powerpc/pseries/vas: Close windows with DLPAR
> core removal") unmaps the window paste address and issues HCALL to
> close window in the hypervisor for migration or DLPAR core removal
> events. So holds mmap_mutex and then mmap lock before unmap the
> paste address. But if the user space issue mmap paste address at
> the same time with the migration event, coproc_mmap() is called
> after holding the mmap lock which can trigger deadlock when trying
> to acquire mmap_mutex in coproc_mmap().
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/pseries/vas: Hold mmap_mutex after mmap lock during window close
      https://git.kernel.org/powerpc/c/b59c9dc4d9d47b3c4572d826603fde507055b656

cheers