brcmfmac: streamline SDIO dpc

Streamline SDIO dpc by removing some unnecessary code path.
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c

@@ -2330,15 +2330,11 @@ static void brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
 				bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
 			}
 			bus->clkstate = CLK_AVAIL;
-		} else {
-			goto clkwait;
 		}
 	}
 
 	/* Make sure backplane clock is on */
 	brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, true);
-	if (bus->clkstate == CLK_PENDING)
-		goto clkwait;
 
 	/* Pending interrupt indicates new device status */
 	if (atomic_read(&bus->ipend) > 0) {
@@ -2412,7 +2408,7 @@ static void brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
 		intstatus &= ~I_HMB_FRAME_IND;
 
 	/* On frame indication, read available frames */
-	if (PKT_AVAILABLE()) {
+	if (PKT_AVAILABLE() && bus->clkstate == CLK_AVAIL) {
 		framecnt = brcmf_sdbrcm_readframes(bus, rxlimit, &rxdone);
 		if (rxdone || bus->rxskip)
 			intstatus &= ~I_HMB_FRAME_IND;
@@ -2422,22 +2418,21 @@ static void brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
 	/* Keep still-pending events for next scheduling */
 	bus->intstatus = intstatus;
 
-clkwait:
 	brcmf_sdbrcm_clrintr(bus);
 
 	if (data_ok(bus) && bus->ctrl_frame_stat &&
 		(bus->clkstate == CLK_AVAIL)) {
-		int ret, i;
+		int i;
 
-		ret = brcmf_sdcard_send_buf(bus->sdiodev, bus->sdiodev->sbwad,
+		err = brcmf_sdcard_send_buf(bus->sdiodev, bus->sdiodev->sbwad,
 			SDIO_FUNC_2, F2SYNC, bus->ctrl_frame_buf,
 			(u32) bus->ctrl_frame_len);
 
-		if (ret < 0) {
+		if (err < 0) {
 			/* On failure, abort the command and
 				terminate the frame */
 			brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
-				  ret);
+				  err);
 			bus->sdcnt.tx_sderrs++;
 
 			brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
@@ -2459,10 +2454,9 @@ static void brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
 					break;
 			}
 
-		}
-		if (ret == 0)
+		} else {
 			bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;
-
+		}
 		bus->ctrl_frame_stat = false;
 		brcmf_sdbrcm_wait_event_wakeup(bus);
 	}
@@ -2475,17 +2469,10 @@ static void brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
 		txlimit -= framecnt;
 	}
 
-	/* Resched if events or tx frames are pending,
-		 else await next interrupt */
-	/* On failed register access, all bets are off:
-		 no resched or interrupts */
 	if ((bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) || (err != 0)) {
 		brcmf_dbg(ERROR, "failed backplane access over SDIO, halting operation\n");
 		bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
 		bus->intstatus = 0;
-	} else if (bus->clkstate == CLK_PENDING) {
-		brcmf_dbg(INFO, "rescheduled due to CLK_PENDING awaiting I_CHIPACTIVE interrupt\n");
-		brcmf_sdbrcm_adddpctsk(bus);
 	} else if (bus->intstatus || atomic_read(&bus->ipend) > 0 ||
 		(!bus->fcstate && brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol)
 		 && data_ok(bus)) || PKT_AVAILABLE()) {