ath9k_hw: make bluetooth coexistence support optional at compile time

Many systems (e.g. embedded systems) do not have wifi modules connected to
bluetooth modules, so bluetooth coexistence is irrelevant there. With the
addition of MCI support, ath9k picked up quite a bit of extra code that
can be compiled out this way.

This patch redefines ATH9K_HW_CAP_MCI and adds an inline wrapper for
querying the bluetooth coexistence scheme, allowing the compiler to
eliminate code that uses it, with only very little use of #ifdef.

On MIPS this reduces the total size for the modules by about 20k.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
index ca9b53cc4001..fee8c6f0b251 100644
--- a/drivers/net/wireless/ath/ath9k/mci.c
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -417,6 +417,9 @@ int ath_mci_setup(struct ath_softc *sc)
         struct ath_mci_coex *mci = &sc->mci_coex;
         int error = 0;
 
+        if (!ATH9K_HW_CAP_MCI)
+                return 0;
+
         mci->sched_buf.bf_len = ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE;
 
         if (ath_mci_buf_alloc(sc, &mci->sched_buf)) {
@@ -450,6 +453,9 @@ void ath_mci_cleanup(struct ath_softc *sc)
         struct ath_hw *ah = sc->sc_ah;
         struct ath_mci_coex *mci = &sc->mci_coex;
 
+        if (!ATH9K_HW_CAP_MCI)
+                return;
+
         /*
          * both schedule and gpm buffers will be released
          */
@@ -468,6 +474,9 @@ void ath_mci_intr(struct ath_softc *sc)
         u32 more_data = MCI_GPM_MORE;
         bool skip_gpm = false;
 
+        if (!ATH9K_HW_CAP_MCI)
+                return;
+
         ar9003_mci_get_interrupt(sc->sc_ah, &mci_int, &mci_int_rxmsg);
 
         if (ar9003_mci_state(ah, MCI_STATE_ENABLE, NULL) == 0) {