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commit 1716efdb07938bd6510e1127d02012799112c433 upstream. `ring_interrupt_index` doesn't change the data for `ring` so mark it as const. This is needed by the following patch that disables interrupt auto clear for rings. Cc: Sanju Mehta <Sanju.Mehta@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>