diff --git a/sound/pci/ctxfi/ctamixer.c b/sound/pci/ctxfi/ctamixer.c
index a7f4a67..fee35cf 100644
--- a/sound/pci/ctxfi/ctamixer.c
+++ b/sound/pci/ctxfi/ctamixer.c
@@ -63,7 +63,7 @@
 	hw = amixer->rsc.hw;
 	hw->amixer_set_mode(amixer->rsc.ctrl_blk, AMIXER_Y_IMMEDIATE);
 	amixer->input = rsc;
-	if (NULL == rsc)
+	if (!rsc)
 		hw->amixer_set_x(amixer->rsc.ctrl_blk, BLANK_SLOT);
 	else
 		hw->amixer_set_x(amixer->rsc.ctrl_blk,
@@ -99,7 +99,7 @@
 
 	hw = amixer->rsc.hw;
 	amixer->sum = sum;
-	if (NULL == sum) {
+	if (!sum) {
 		hw->amixer_set_se(amixer->rsc.ctrl_blk, 0);
 	} else {
 		hw->amixer_set_se(amixer->rsc.ctrl_blk, 1);
@@ -124,20 +124,20 @@
 
 	/* Program master and conjugate resources */
 	amixer->rsc.ops->master(&amixer->rsc);
-	if (NULL != input)
+	if (input)
 		input->ops->master(input);
 
-	if (NULL != sum)
+	if (sum)
 		sum->rsc.ops->master(&sum->rsc);
 
 	for (i = 0; i < amixer->rsc.msr; i++) {
 		hw->amixer_set_dirty_all(amixer->rsc.ctrl_blk);
-		if (NULL != input) {
+		if (input) {
 			hw->amixer_set_x(amixer->rsc.ctrl_blk,
 						input->ops->output_slot(input));
 			input->ops->next_conj(input);
 		}
-		if (NULL != sum) {
+		if (sum) {
 			hw->amixer_set_sadr(amixer->rsc.ctrl_blk,
 						sum->rsc.ops->index(&sum->rsc));
 			sum->rsc.ops->next_conj(&sum->rsc);
@@ -147,10 +147,10 @@
 		amixer->rsc.ops->next_conj(&amixer->rsc);
 	}
 	amixer->rsc.ops->master(&amixer->rsc);
-	if (NULL != input)
+	if (input)
 		input->ops->master(input);
 
-	if (NULL != sum)
+	if (sum)
 		sum->rsc.ops->master(&sum->rsc);
 
 	return 0;
@@ -303,7 +303,7 @@
 
 	*ramixer_mgr = NULL;
 	amixer_mgr = kzalloc(sizeof(*amixer_mgr), GFP_KERNEL);
-	if (NULL == amixer_mgr)
+	if (!amixer_mgr)
 		return -ENOMEM;
 
 	err = rsc_mgr_init(&amixer_mgr->mgr, AMIXER, AMIXER_RESOURCE_NUM, hw);
@@ -456,7 +456,7 @@
 
 	*rsum_mgr = NULL;
 	sum_mgr = kzalloc(sizeof(*sum_mgr), GFP_KERNEL);
-	if (NULL == sum_mgr)
+	if (!sum_mgr)
 		return -ENOMEM;
 
 	err = rsc_mgr_init(&sum_mgr->mgr, SUM, SUM_RESOURCE_NUM, hw);
diff --git a/sound/pci/ctxfi/ctatc.c b/sound/pci/ctxfi/ctatc.c
index a49c766..b1b3a64 100644
--- a/sound/pci/ctxfi/ctatc.c
+++ b/sound/pci/ctxfi/ctatc.c
@@ -136,7 +136,7 @@
 	struct snd_pcm_runtime *runtime;
 	struct ct_vm *vm;
 
-	if (NULL == apcm->substream)
+	if (!apcm->substream)
 		return 0;
 
 	runtime = apcm->substream->runtime;
@@ -144,7 +144,7 @@
 
 	apcm->vm_block = vm->map(vm, apcm->substream, runtime->dma_bytes);
 
-	if (NULL == apcm->vm_block)
+	if (!apcm->vm_block)
 		return -ENOENT;
 
 	return 0;
@@ -154,7 +154,7 @@
 {
 	struct ct_vm *vm;
 
-	if (NULL == apcm->vm_block)
+	if (!apcm->vm_block)
 		return;
 
 	vm = atc->vm;
@@ -231,16 +231,16 @@
 
 static int select_rom(unsigned int pitch)
 {
-	if ((pitch > 0x00428f5c) && (pitch < 0x01b851ec)) {
+	if (pitch > 0x00428f5c && pitch < 0x01b851ec) {
 		/* 0.26 <= pitch <= 1.72 */
 		return 1;
-	} else if ((0x01d66666 == pitch) || (0x01d66667 == pitch)) {
+	} else if (pitch == 0x01d66666 || pitch == 0x01d66667) {
 		/* pitch == 1.8375 */
 		return 2;
-	} else if (0x02000000 == pitch) {
+	} else if (pitch == 0x02000000) {
 		/* pitch == 2 */
 		return 3;
-	} else if ((pitch >= 0x0) && (pitch <= 0x08000000)) {
+	} else if (pitch >= 0x0 && pitch <= 0x08000000) {
 		/* 0 <= pitch <= 8 */
 		return 0;
 	} else {
@@ -283,7 +283,7 @@
 	/* Get AMIXER resource */
 	n_amixer = (n_amixer < 2) ? 2 : n_amixer;
 	apcm->amixers = kzalloc(sizeof(void *)*n_amixer, GFP_KERNEL);
-	if (NULL == apcm->amixers) {
+	if (!apcm->amixers) {
 		err = -ENOMEM;
 		goto error1;
 	}
@@ -311,7 +311,7 @@
 					INIT_VOL, atc->pcm[i+device*2]);
 		mutex_unlock(&atc->atc_mutex);
 		src = src->ops->next_interleave(src);
-		if (NULL == src)
+		if (!src)
 			src = apcm->src;
 	}
 
@@ -334,7 +334,7 @@
 	struct srcimp *srcimp;
 	int i;
 
-	if (NULL != apcm->srcimps) {
+	if (apcm->srcimps) {
 		for (i = 0; i < apcm->n_srcimp; i++) {
 			srcimp = apcm->srcimps[i];
 			srcimp->ops->unmap(srcimp);
@@ -345,7 +345,7 @@
 		apcm->srcimps = NULL;
 	}
 
-	if (NULL != apcm->srccs) {
+	if (apcm->srccs) {
 		for (i = 0; i < apcm->n_srcc; i++) {
 			src_mgr->put_src(src_mgr, apcm->srccs[i]);
 			apcm->srccs[i] = NULL;
@@ -354,7 +354,7 @@
 		apcm->srccs = NULL;
 	}
 
-	if (NULL != apcm->amixers) {
+	if (apcm->amixers) {
 		for (i = 0; i < apcm->n_amixer; i++) {
 			amixer_mgr->put_amixer(amixer_mgr, apcm->amixers[i]);
 			apcm->amixers[i] = NULL;
@@ -363,17 +363,17 @@
 		apcm->amixers = NULL;
 	}
 
-	if (NULL != apcm->mono) {
+	if (apcm->mono) {
 		sum_mgr->put_sum(sum_mgr, apcm->mono);
 		apcm->mono = NULL;
 	}
 
-	if (NULL != apcm->src) {
+	if (apcm->src) {
 		src_mgr->put_src(src_mgr, apcm->src);
 		apcm->src = NULL;
 	}
 
-	if (NULL != apcm->vm_block) {
+	if (apcm->vm_block) {
 		/* Undo device virtual mem map */
 		ct_unmap_audio_buffer(atc, apcm);
 		apcm->vm_block = NULL;
@@ -419,7 +419,7 @@
 	src->ops->set_state(src, SRC_STATE_OFF);
 	src->ops->commit_write(src);
 
-	if (NULL != apcm->srccs) {
+	if (apcm->srccs) {
 		for (i = 0; i < apcm->n_srcc; i++) {
 			src = apcm->srccs[i];
 			src->ops->set_bm(src, 0);
@@ -544,18 +544,18 @@
 
 	if (n_srcc) {
 		apcm->srccs = kzalloc(sizeof(void *)*n_srcc, GFP_KERNEL);
-		if (NULL == apcm->srccs)
+		if (!apcm->srccs)
 			return -ENOMEM;
 	}
 	if (n_amixer) {
 		apcm->amixers = kzalloc(sizeof(void *)*n_amixer, GFP_KERNEL);
-		if (NULL == apcm->amixers) {
+		if (!apcm->amixers) {
 			err = -ENOMEM;
 			goto error1;
 		}
 	}
 	apcm->srcimps = kzalloc(sizeof(void *)*n_srcimp, GFP_KERNEL);
-	if (NULL == apcm->srcimps) {
+	if (!apcm->srcimps) {
 		err = -ENOMEM;
 		goto error1;
 	}
@@ -818,7 +818,7 @@
 	/* Get AMIXER resource */
 	n_amixer = (n_amixer < 2) ? 2 : n_amixer;
 	apcm->amixers = kzalloc(sizeof(void *)*n_amixer, GFP_KERNEL);
-	if (NULL == apcm->amixers) {
+	if (!apcm->amixers) {
 		err = -ENOMEM;
 		goto error1;
 	}
@@ -919,7 +919,7 @@
 		amixer = apcm->amixers[i];
 		amixer->ops->setup(amixer, &src->rsc, INIT_VOL, NULL);
 		src = src->ops->next_interleave(src);
-		if (NULL == src)
+		if (!src)
 			src = apcm->src;
 	}
 	/* Connect to SPDIFOO */
@@ -1121,7 +1121,7 @@
 	struct ct_mixer *mixer = NULL;
 
 	/* disconnect internal mixer objects */
-	if (NULL != atc->mixer) {
+	if (atc->mixer) {
 		mixer = atc->mixer;
 		mixer->set_input_left(mixer, MIX_LINE_IN, NULL);
 		mixer->set_input_right(mixer, MIX_LINE_IN, NULL);
@@ -1131,7 +1131,7 @@
 		mixer->set_input_right(mixer, MIX_SPDIF_IN, NULL);
 	}
 
-	if (NULL != atc->daios) {
+	if (atc->daios) {
 		daio_mgr = (struct daio_mgr *)atc->rsc_mgrs[DAIO];
 		for (i = 0; i < atc->n_daio; i++) {
 			daio = atc->daios[i];
@@ -1149,7 +1149,7 @@
 		atc->daios = NULL;
 	}
 
-	if (NULL != atc->pcm) {
+	if (atc->pcm) {
 		sum_mgr = atc->rsc_mgrs[SUM];
 		for (i = 0; i < atc->n_pcm; i++)
 			sum_mgr->put_sum(sum_mgr, atc->pcm[i]);
@@ -1158,7 +1158,7 @@
 		atc->pcm = NULL;
 	}
 
-	if (NULL != atc->srcs) {
+	if (atc->srcs) {
 		src_mgr = atc->rsc_mgrs[SRC];
 		for (i = 0; i < atc->n_src; i++)
 			src_mgr->put_src(src_mgr, atc->srcs[i]);
@@ -1167,7 +1167,7 @@
 		atc->srcs = NULL;
 	}
 
-	if (NULL != atc->srcimps) {
+	if (atc->srcimps) {
 		srcimp_mgr = atc->rsc_mgrs[SRCIMP];
 		for (i = 0; i < atc->n_srcimp; i++) {
 			srcimp = atc->srcimps[i];
@@ -1185,7 +1185,7 @@
 {
 	int i = 0;
 
-	if (NULL == atc)
+	if (!atc)
 		return 0;
 
 	if (atc->timer) {
@@ -1196,21 +1196,20 @@
 	atc_release_resources(atc);
 
 	/* Destroy internal mixer objects */
-	if (NULL != atc->mixer)
+	if (atc->mixer)
 		ct_mixer_destroy(atc->mixer);
 
 	for (i = 0; i < NUM_RSCTYP; i++) {
-		if ((NULL != rsc_mgr_funcs[i].destroy) &&
-		    (NULL != atc->rsc_mgrs[i]))
+		if (rsc_mgr_funcs[i].destroy && atc->rsc_mgrs[i])
 			rsc_mgr_funcs[i].destroy(atc->rsc_mgrs[i]);
 
 	}
 
-	if (NULL != atc->hw)
+	if (atc->hw)
 		destroy_hw_obj((struct hw *)atc->hw);
 
 	/* Destroy device virtual memory manager object */
-	if (NULL != atc->vm) {
+	if (atc->vm) {
 		ct_vm_destroy(atc->vm);
 		atc->vm = NULL;
 	}
@@ -1275,7 +1274,7 @@
 	alsa_dev_funcs[MIXER].public_name = atc->chip_name;
 
 	for (i = 0; i < NUM_CTALSADEVS; i++) {
-		if (NULL == alsa_dev_funcs[i].create)
+		if (!alsa_dev_funcs[i].create)
 			continue;
 
 		err = alsa_dev_funcs[i].create(atc, i,
@@ -1312,7 +1311,7 @@
 		return err;
 
 	for (i = 0; i < NUM_RSCTYP; i++) {
-		if (NULL == rsc_mgr_funcs[i].create)
+		if (!rsc_mgr_funcs[i].create)
 			continue;
 
 		err = rsc_mgr_funcs[i].create(atc->hw, &atc->rsc_mgrs[i]);
@@ -1339,19 +1338,19 @@
 	int err, i;
 
 	atc->daios = kzalloc(sizeof(void *)*(DAIONUM), GFP_KERNEL);
-	if (NULL == atc->daios)
+	if (!atc->daios)
 		return -ENOMEM;
 
 	atc->srcs = kzalloc(sizeof(void *)*(2*2), GFP_KERNEL);
-	if (NULL == atc->srcs)
+	if (!atc->srcs)
 		return -ENOMEM;
 
 	atc->srcimps = kzalloc(sizeof(void *)*(2*2), GFP_KERNEL);
-	if (NULL == atc->srcimps)
+	if (!atc->srcimps)
 		return -ENOMEM;
 
 	atc->pcm = kzalloc(sizeof(void *)*(2*4), GFP_KERNEL);
-	if (NULL == atc->pcm)
+	if (!atc->pcm)
 		return -ENOMEM;
 
 	daio_mgr = (struct daio_mgr *)atc->rsc_mgrs[DAIO];
@@ -1648,7 +1647,7 @@
 	*ratc = NULL;
 
 	atc = kzalloc(sizeof(*atc), GFP_KERNEL);
-	if (NULL == atc)
+	if (!atc)
 		return -ENOMEM;
 
 	/* Set operations */
diff --git a/sound/pci/ctxfi/ctdaio.c b/sound/pci/ctxfi/ctdaio.c
index deb6cfa..af56eb9 100644
--- a/sound/pci/ctxfi/ctdaio.c
+++ b/sound/pci/ctxfi/ctdaio.c
@@ -173,7 +173,7 @@
 	int i;
 
 	entry = kzalloc((sizeof(*entry) * daio->rscl.msr), GFP_KERNEL);
-	if (NULL == entry)
+	if (!entry)
 		return -ENOMEM;
 
 	/* Program master and conjugate resources */
@@ -201,7 +201,7 @@
 	int i;
 
 	entry = kzalloc((sizeof(*entry) * daio->rscr.msr), GFP_KERNEL);
-	if (NULL == entry)
+	if (!entry)
 		return -ENOMEM;
 
 	/* Program master and conjugate resources */
@@ -228,7 +228,7 @@
 	struct daio *daio = &dao->daio;
 	int i;
 
-	if (NULL == dao->imappers[0])
+	if (!dao->imappers[0])
 		return 0;
 
 	entry = dao->imappers[0];
@@ -252,7 +252,7 @@
 	struct daio *daio = &dao->daio;
 	int i;
 
-	if (NULL == dao->imappers[daio->rscl.msr])
+	if (!dao->imappers[daio->rscl.msr])
 		return 0;
 
 	entry = dao->imappers[daio->rscl.msr];
@@ -408,7 +408,7 @@
 		return err;
 
 	dao->imappers = kzalloc(sizeof(void *)*desc->msr*2, GFP_KERNEL);
-	if (NULL == dao->imappers) {
+	if (!dao->imappers) {
 		err = -ENOMEM;
 		goto error1;
 	}
@@ -442,11 +442,11 @@
 
 static int dao_rsc_uninit(struct dao *dao)
 {
-	if (NULL != dao->imappers) {
-		if (NULL != dao->imappers[0])
+	if (dao->imappers) {
+		if (dao->imappers[0])
 			dao_clear_left_input(dao);
 
-		if (NULL != dao->imappers[dao->daio.rscl.msr])
+		if (dao->imappers[dao->daio.rscl.msr])
 			dao_clear_right_input(dao);
 
 		kfree(dao->imappers);
@@ -555,7 +555,7 @@
 	/* Allocate mem for daio resource */
 	if (desc->type <= DAIO_OUT_MAX) {
 		dao = kzalloc(sizeof(*dao), GFP_KERNEL);
-		if (NULL == dao) {
+		if (!dao) {
 			err = -ENOMEM;
 			goto error;
 		}
@@ -566,7 +566,7 @@
 		*rdaio = &dao->daio;
 	} else {
 		dai = kzalloc(sizeof(*dai), GFP_KERNEL);
-		if (NULL == dai) {
+		if (!dai) {
 			err = -ENOMEM;
 			goto error;
 		}
@@ -583,9 +583,9 @@
 	return 0;
 
 error:
-	if (NULL != dao)
+	if (dao)
 		kfree(dao);
-	else if (NULL != dai)
+	else if (dai)
 		kfree(dai);
 
 	spin_lock_irqsave(&mgr->mgr_lock, flags);
@@ -663,7 +663,7 @@
 	int err;
 
 	spin_lock_irqsave(&mgr->imap_lock, flags);
-	if ((0 == entry->addr) && (mgr->init_imap_added)) {
+	if (!entry->addr && mgr->init_imap_added) {
 		input_mapper_delete(&mgr->imappers, mgr->init_imap,
 							daio_map_op, mgr);
 		mgr->init_imap_added = 0;
@@ -707,7 +707,7 @@
 
 	*rdaio_mgr = NULL;
 	daio_mgr = kzalloc(sizeof(*daio_mgr), GFP_KERNEL);
-	if (NULL == daio_mgr)
+	if (!daio_mgr)
 		return -ENOMEM;
 
 	err = rsc_mgr_init(&daio_mgr->mgr, DAIO, DAIO_RESOURCE_NUM, hw);
@@ -718,7 +718,7 @@
 	spin_lock_init(&daio_mgr->imap_lock);
 	INIT_LIST_HEAD(&daio_mgr->imappers);
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
-	if (NULL == entry) {
+	if (!entry) {
 		err = -ENOMEM;
 		goto error2;
 	}
diff --git a/sound/pci/ctxfi/cthw20k1.c b/sound/pci/ctxfi/cthw20k1.c
index ad3e1d1..0cf400f 100644
--- a/sound/pci/ctxfi/cthw20k1.c
+++ b/sound/pci/ctxfi/cthw20k1.c
@@ -168,7 +168,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -494,7 +494,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -515,7 +515,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -702,7 +702,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -723,7 +723,7 @@
 
 	*rblk = NULL;
 	/*blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;*/
@@ -909,7 +909,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -958,7 +958,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -1152,7 +1152,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	blk->i2sctl = hw_read_20kx(hw, I2SCTL);
@@ -1808,7 +1808,7 @@
 	/* By default, Hendrix card UAA Bar0 should be using memory... */
 	io_base = pci_resource_start(pci, 0);
 	mem_base = ioremap(io_base, pci_resource_len(pci, 0));
-	if (NULL == mem_base)
+	if (!mem_base)
 		return -ENOENT;
 
 	/* Read current mode from Mode Change Register */
@@ -1977,7 +1977,7 @@
 
 	hw->irq	= -1;
 
-	if (NULL != ((void *)hw->mem_base))
+	if (hw->mem_base)
 		iounmap((void *)hw->mem_base);
 
 	hw->mem_base = (unsigned long)NULL;
@@ -2274,7 +2274,7 @@
 
 	*rhw = NULL;
 	hw20k1 = kzalloc(sizeof(*hw20k1), GFP_KERNEL);
-	if (NULL == hw20k1)
+	if (!hw20k1)
 		return -ENOMEM;
 
 	spin_lock_init(&hw20k1->reg_20k1_lock);
diff --git a/sound/pci/ctxfi/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
index 0c4db2d..b6b11bf 100644
--- a/sound/pci/ctxfi/cthw20k2.c
+++ b/sound/pci/ctxfi/cthw20k2.c
@@ -166,7 +166,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -492,7 +492,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -513,7 +513,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -702,7 +702,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -891,7 +891,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -941,7 +941,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	*rblk = blk;
@@ -1092,7 +1092,7 @@
 
 	*rblk = NULL;
 	blk = kzalloc(sizeof(*blk), GFP_KERNEL);
-	if (NULL == blk)
+	if (!blk)
 		return -ENOMEM;
 
 	for (i = 0; i < 8; i++) {
@@ -1904,7 +1904,7 @@
 		hw->io_base = pci_resource_start(hw->pci, 2);
 		hw->mem_base = (unsigned long)ioremap(hw->io_base,
 					pci_resource_len(hw->pci, 2));
-		if (NULL == (void *)hw->mem_base) {
+		if (!hw->mem_base) {
 			err = -ENOENT;
 			goto error2;
 		}
@@ -1962,7 +1962,7 @@
 
 	hw->irq	= -1;
 
-	if (NULL != ((void *)hw->mem_base))
+	if (hw->mem_base)
 		iounmap((void *)hw->mem_base);
 
 	hw->mem_base = (unsigned long)NULL;
diff --git a/sound/pci/ctxfi/ctmixer.c b/sound/pci/ctxfi/ctmixer.c
index f26d7cd..15c1e72 100644
--- a/sound/pci/ctxfi/ctmixer.c
+++ b/sound/pci/ctxfi/ctmixer.c
@@ -654,7 +654,7 @@
 	int err;
 
 	kctl = snd_ctl_new1(new, mixer->atc);
-	if (NULL == kctl)
+	if (!kctl)
 		return -ENOMEM;
 
 	if (SNDRV_CTL_ELEM_IFACE_PCM == kctl->id.iface)
@@ -837,17 +837,17 @@
 	*rmixer = NULL;
 	/* Allocate mem for mixer obj */
 	mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
-	if (NULL == mixer)
+	if (!mixer)
 		return -ENOMEM;
 
 	mixer->amixers = kzalloc(sizeof(void *)*(NUM_CT_AMIXERS*CHN_NUM),
 				 GFP_KERNEL);
-	if (NULL == mixer->amixers) {
+	if (!mixer->amixers) {
 		err = -ENOMEM;
 		goto error1;
 	}
 	mixer->sums = kzalloc(sizeof(void *)*(NUM_CT_SUMS*CHN_NUM), GFP_KERNEL);
-	if (NULL == mixer->sums) {
+	if (!mixer->sums) {
 		err = -ENOMEM;
 		goto error2;
 	}
diff --git a/sound/pci/ctxfi/ctpcm.c b/sound/pci/ctxfi/ctpcm.c
index 60ea231..d0dc227 100644
--- a/sound/pci/ctxfi/ctpcm.c
+++ b/sound/pci/ctxfi/ctpcm.c
@@ -97,7 +97,7 @@
 {
 	struct ct_atc_pcm *apcm = atc_pcm;
 
-	if (NULL == apcm->substream)
+	if (!apcm->substream)
 		return;
 
 	snd_pcm_period_elapsed(apcm->substream);
@@ -123,7 +123,7 @@
 	int err;
 
 	apcm = kzalloc(sizeof(*apcm), GFP_KERNEL);
-	if (NULL == apcm)
+	if (!apcm)
 		return -ENOMEM;
 
 	apcm->substream = substream;
@@ -271,7 +271,7 @@
 	int err;
 
 	apcm = kzalloc(sizeof(*apcm), GFP_KERNEL);
-	if (NULL == apcm)
+	if (!apcm)
 		return -ENOMEM;
 
 	apcm->started = 0;
diff --git a/sound/pci/ctxfi/ctresource.c b/sound/pci/ctxfi/ctresource.c
index 889c495..7dfaf67 100644
--- a/sound/pci/ctxfi/ctresource.c
+++ b/sound/pci/ctxfi/ctresource.c
@@ -144,7 +144,7 @@
 	rsc->msr = msr;
 	rsc->hw = hw;
 	rsc->ops = &rsc_generic_ops;
-	if (NULL == hw) {
+	if (!hw) {
 		rsc->ctrl_blk = NULL;
 		return 0;
 	}
@@ -216,7 +216,7 @@
 	mgr->type = NUM_RSCTYP;
 
 	mgr->rscs = kzalloc(((amount + 8 - 1) / 8), GFP_KERNEL);
-	if (NULL == mgr->rscs)
+	if (!mgr->rscs)
 		return -ENOMEM;
 
 	switch (type) {
diff --git a/sound/pci/ctxfi/ctsrc.c b/sound/pci/ctxfi/ctsrc.c
index df43a5c..c749fa7 100644
--- a/sound/pci/ctxfi/ctsrc.c
+++ b/sound/pci/ctxfi/ctsrc.c
@@ -441,7 +441,7 @@
 	else
 		src = kzalloc(sizeof(*src), GFP_KERNEL);
 
-	if (NULL == src) {
+	if (!src) {
 		err = -ENOMEM;
 		goto error1;
 	}
@@ -550,7 +550,7 @@
 
 	*rsrc_mgr = NULL;
 	src_mgr = kzalloc(sizeof(*src_mgr), GFP_KERNEL);
-	if (NULL == src_mgr)
+	if (!src_mgr)
 		return -ENOMEM;
 
 	err = rsc_mgr_init(&src_mgr->mgr, SRC, SRC_RESOURCE_NUM, hw);
@@ -679,7 +679,7 @@
 	/* Reserve memory for imapper nodes */
 	srcimp->imappers = kzalloc(sizeof(struct imapper)*desc->msr,
 				   GFP_KERNEL);
-	if (NULL == srcimp->imappers) {
+	if (!srcimp->imappers) {
 		err = -ENOMEM;
 		goto error1;
 	}
@@ -833,7 +833,7 @@
 
 	*rsrcimp_mgr = NULL;
 	srcimp_mgr = kzalloc(sizeof(*srcimp_mgr), GFP_KERNEL);
-	if (NULL == srcimp_mgr)
+	if (!srcimp_mgr)
 		return -ENOMEM;
 
 	err = rsc_mgr_init(&srcimp_mgr->mgr, SRCIMP, SRCIMP_RESOURCE_NUM, hw);
@@ -844,7 +844,7 @@
 	spin_lock_init(&srcimp_mgr->imap_lock);
 	INIT_LIST_HEAD(&srcimp_mgr->imappers);
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
-	if (NULL == entry) {
+	if (!entry) {
 		err = -ENOMEM;
 		goto error2;
 	}
diff --git a/sound/pci/ctxfi/ctvmem.c b/sound/pci/ctxfi/ctvmem.c
index 67665a7..6b78752 100644
--- a/sound/pci/ctxfi/ctvmem.c
+++ b/sound/pci/ctxfi/ctvmem.c
@@ -60,7 +60,7 @@
 	}
 
 	block = kzalloc(sizeof(*block), GFP_KERNEL);
-	if (NULL == block)
+	if (!block)
 		goto out;
 
 	block->addr = entry->addr;
@@ -181,7 +181,7 @@
 	*rvm = NULL;
 
 	vm = kzalloc(sizeof(*vm), GFP_KERNEL);
-	if (NULL == vm)
+	if (!vm)
 		return -ENOMEM;
 
 	mutex_init(&vm->lock);
@@ -189,7 +189,7 @@
 	/* Allocate page table pages */
 	for (i = 0; i < CT_PTP_NUM; i++) {
 		vm->ptp[i] = kmalloc(PAGE_SIZE, GFP_KERNEL);
-		if (NULL == vm->ptp[i])
+		if (!vm->ptp[i])
 			break;
 	}
 	if (!i) {