ath9k: Cleanup MCI init/deinit routines

This patch simplifies the buffer allocation functions
for MCI and removes unneeded memset calls. Also, a couple
of unused variables are removed and a memory leak in DMA
allocation is fixed.

[ 1263.788267] WARNING: at /home/sujith/dev/wireless-testing/lib/dma-debug.c:875 check_unmap+0x173/0x7e0()
[ 1263.788273] ath9k 0000:06:00.0: DMA-API: device driver frees DMA memory with different size
               [device address=0x0000000071908000] [map size=512 bytes] [unmap size=256 bytes]
[ 1263.788345] Pid: 774, comm: rmmod Tainted: G        W  O 3.3.0-rc3-wl #18
[ 1263.788348] Call Trace:
[ 1263.788355]  [<ffffffff8105110f>] warn_slowpath_common+0x7f/0xc0
[ 1263.788359]  [<ffffffff81051206>] warn_slowpath_fmt+0x46/0x50
[ 1263.788363]  [<ffffffff8125a713>] check_unmap+0x173/0x7e0
[ 1263.788368]  [<ffffffff8123fc22>] ? prio_tree_left+0x32/0xc0
[ 1263.788373]  [<ffffffff8125aded>] debug_dma_free_coherent+0x6d/0x80
[ 1263.788381]  [<ffffffffa0701c3c>] ath_mci_cleanup+0x7c/0x110 [ath9k]
[ 1263.788387]  [<ffffffffa06f4033>] ath9k_deinit_softc+0x113/0x120 [ath9k]
[ 1263.788392]  [<ffffffffa06f55cc>] ath9k_deinit_device+0x5c/0x70 [ath9k]
[ 1263.788397]  [<ffffffffa0704934>] ath_pci_remove+0x54/0xa0 [ath9k]
[ 1263.788401]  [<ffffffff81267d06>] pci_device_remove+0x46/0x110
[ 1263.788406]  [<ffffffff813102bc>] __device_release_driver+0x7c/0xe0
[ 1263.788410]  [<ffffffff81310a00>] driver_detach+0xd0/0xe0
[ 1263.788414]  [<ffffffff81310118>] bus_remove_driver+0x88/0xe0
[ 1263.788418]  [<ffffffff813111c2>] driver_unregister+0x62/0xa0
[ 1263.788421]  [<ffffffff812680c4>] pci_unregister_driver+0x44/0xc0
[ 1263.788427]  [<ffffffffa0705015>] ath_pci_exit+0x15/0x20 [ath9k]
[ 1263.788432]  [<ffffffffa070a92d>] ath9k_exit+0x15/0x31 [ath9k]
[ 1263.788436]  [<ffffffff810b971c>] sys_delete_module+0x18c/0x270
[ 1263.788441]  [<ffffffff81436edd>] ? retint_swapgs+0x13/0x1b
[ 1263.788446]  [<ffffffff812483be>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 1263.788450]  [<ffffffff814378e9>] system_call_fastpath+0x16/0x1b
[ 1263.788453] ---[ end trace 3ab4d030ffde40d4 ]---

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_mci.c

@@ -973,7 +973,6 @@ void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
 		      u16 len, u32 sched_addr)
 {
 	struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
-	void *sched_buf = (void *)((char *) gpm_buf + (sched_addr - gpm_addr));
 
 	if (!ATH9K_HW_CAP_MCI)
 		return;
@@ -982,7 +981,6 @@ void ar9003_mci_setup(struct ath_hw *ah, u32 gpm_addr, void *gpm_buf,
 	mci->gpm_buf = gpm_buf;
 	mci->gpm_len = len;
 	mci->sched_addr = sched_addr;
-	mci->sched_buf = sched_buf;
 
 	ar9003_mci_reset(ah, true, true, true);
 }
@@ -990,14 +988,11 @@ EXPORT_SYMBOL(ar9003_mci_setup);
 
 void ar9003_mci_cleanup(struct ath_hw *ah)
 {
-	struct ath_common *common = ath9k_hw_common(ah);
-
 	if (!ATH9K_HW_CAP_MCI)
 		return;
 
 	/* Turn off MCI and Jupiter mode. */
 	REG_WRITE(ah, AR_BTCOEX_CTRL, 0x00);
-	ath_dbg(common, MCI, "MCI ar9003_mci_cleanup\n");
 	ar9003_mci_disable_interrupt(ah);
 }
 EXPORT_SYMBOL(ar9003_mci_cleanup);

drivers/net/wireless/ath/ath9k/btcoex.h

@@ -67,7 +67,6 @@ struct ath9k_hw_mci {
 	u32 wlan_cal_done;
 	u32 config;
 	u8 *gpm_buf;
-	u8 *sched_buf;
 	bool ready;
 	bool update_2g5g;
 	bool is_2g;

drivers/net/wireless/ath/ath9k/mci.c

@@ -383,84 +383,60 @@ static void ath_mci_msg(struct ath_softc *sc, u8 opcode, u8 *rx_payload)
 	}
 }
 
-static int ath_mci_buf_alloc(struct ath_softc *sc, struct ath_mci_buf *buf)
-{
-	int error = 0;
-
-	buf->bf_addr = dma_alloc_coherent(sc->dev, buf->bf_len,
-					  &buf->bf_paddr, GFP_KERNEL);
-
-	if (buf->bf_addr == NULL) {
-		error = -ENOMEM;
-		goto fail;
-	}
-
-	return 0;
-
-fail:
-	memset(buf, 0, sizeof(*buf));
-	return error;
-}
-
-static void ath_mci_buf_free(struct ath_softc *sc, struct ath_mci_buf *buf)
-{
-	if (buf->bf_addr) {
-		dma_free_coherent(sc->dev, buf->bf_len, buf->bf_addr,
-							buf->bf_paddr);
-		memset(buf, 0, sizeof(*buf));
-	}
-}
-
 int ath_mci_setup(struct ath_softc *sc)
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_mci_coex *mci = &sc->mci_coex;
-	int error = 0;
+	struct ath_mci_buf *buf = &mci->sched_buf;
 
 	if (!ATH9K_HW_CAP_MCI)
 		return 0;
 
-	mci->sched_buf.bf_len = ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE;
+	buf->bf_addr = dma_alloc_coherent(sc->dev,
+				  ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
+				  &buf->bf_paddr, GFP_KERNEL);
 
-	if (ath_mci_buf_alloc(sc, &mci->sched_buf)) {
+	if (buf->bf_addr == NULL) {
 		ath_dbg(common, FATAL, "MCI buffer alloc failed\n");
-		error = -ENOMEM;
-		goto fail;
+		return -ENOMEM;
 	}
 
-	mci->sched_buf.bf_len = ATH_MCI_SCHED_BUF_SIZE;
+	memset(buf->bf_addr, MCI_GPM_RSVD_PATTERN,
+	       ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE);
 
-	memset(mci->sched_buf.bf_addr, MCI_GPM_RSVD_PATTERN,
-						mci->sched_buf.bf_len);
+	mci->sched_buf.bf_len = ATH_MCI_SCHED_BUF_SIZE;
 
 	mci->gpm_buf.bf_len = ATH_MCI_GPM_BUF_SIZE;
-	mci->gpm_buf.bf_addr = (u8 *)mci->sched_buf.bf_addr +
-							mci->sched_buf.bf_len;
+	mci->gpm_buf.bf_addr = (u8 *)mci->sched_buf.bf_addr + mci->sched_buf.bf_len;
 	mci->gpm_buf.bf_paddr = mci->sched_buf.bf_paddr + mci->sched_buf.bf_len;
 
-	/* initialize the buffer */
-	memset(mci->gpm_buf.bf_addr, MCI_GPM_RSVD_PATTERN, mci->gpm_buf.bf_len);
-
 	ar9003_mci_setup(sc->sc_ah, mci->gpm_buf.bf_paddr,
 			 mci->gpm_buf.bf_addr, (mci->gpm_buf.bf_len >> 4),
 			 mci->sched_buf.bf_paddr);
-fail:
-	return error;
+
+	ath_dbg(common, MCI, "MCI Initialized\n");
+
+	return 0;
 }
 
 void ath_mci_cleanup(struct ath_softc *sc)
 {
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_mci_coex *mci = &sc->mci_coex;
+	struct ath_mci_buf *buf = &mci->sched_buf;
 
 	if (!ATH9K_HW_CAP_MCI)
 		return;
 
-	/*
-	 * both schedule and gpm buffers will be released
-	 */
-	ath_mci_buf_free(sc, &mci->sched_buf);
+	if (buf->bf_addr)
+		dma_free_coherent(sc->dev,
+				  ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
+				  buf->bf_addr, buf->bf_paddr);
+
 	ar9003_mci_cleanup(ah);
+
+	ath_dbg(common, MCI, "MCI De-Initialized\n");
 }
 
 void ath_mci_intr(struct ath_softc *sc)

drivers/net/wireless/ath/ath9k/mci.h

@@ -113,7 +113,6 @@ struct ath_mci_profile {
 	u8 num_bdr;
 };
 
-
 struct ath_mci_buf {
 	void *bf_addr;		/* virtual addr of desc */
 	dma_addr_t bf_paddr;    /* physical addr of buffer */
@@ -121,10 +120,8 @@ struct ath_mci_buf {
 };
 
 struct ath_mci_coex {
-	atomic_t mci_cal_flag;
 	struct ath_mci_buf sched_buf;
 	struct ath_mci_buf gpm_buf;
-	u32 bt_cal_start;
 };
 
 void ath_mci_flush_profile(struct ath_mci_profile *mci);