Subject: Re: [PATCH 11/13] ALSA: Deletion of checks before the function call "iounmap"

From: Dan Carpenter <[email-masked]>
Date: Wed, 26 Oct 2016 15:26:05 +0300

Someone was just mentioning in another thread that removing the check
from iounmap() is not portable to other arches and then I remembered
that Markus removed a bunch of these.

We should consider reverting this, perhaps?

regards,
dan carpenter

On Sun, Jan 04, 2015 at 02:36:01PM +0100, SF Markus Elfring wrote:
> From: Markus Elfring <[email-masked]>
> Date: Sat, 3 Jan 2015 22:55:54 +0100
> 
> The iounmap() function performs also input parameter validation.
> Thus the test around the call is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <[email-masked]>
> ---
>  sound/aoa/soundbus/i2sbus/core.c | 13 ++++++-------
>  sound/arm/aaci.c                 |  4 ++--
>  sound/drivers/ml403-ac97cr.c     |  3 +--
>  sound/isa/msnd/msnd_pinnacle.c   |  3 +--
>  sound/parisc/harmony.c           |  4 +---
>  sound/pci/ad1889.c               |  5 +----
>  sound/pci/asihpi/hpioctl.c       |  6 ++----
>  sound/pci/atiixp.c               |  3 +--
>  sound/pci/atiixp_modem.c         |  3 +--
>  sound/pci/aw2/aw2-alsa.c         |  4 +---
>  sound/pci/bt87x.c                |  3 +--
>  sound/pci/cs4281.c               |  6 ++----
>  sound/pci/cs46xx/cs46xx_lib.c    |  4 ++--
>  sound/pci/ctxfi/cthw20k1.c       |  5 +----
>  sound/pci/ctxfi/cthw20k2.c       |  5 +----
>  sound/pci/echoaudio/echoaudio.c  |  6 +-----
>  sound/pci/hda/hda_intel.c        |  3 +--
>  sound/pci/lola/lola.c            |  6 ++----
>  sound/pci/mixart/mixart.c        |  7 +++----
>  sound/pci/nm256/nm256.c          |  6 ++----
>  sound/pci/rme9652/hdsp.c         |  4 +---
>  sound/pci/rme9652/hdspm.c        |  4 +---
>  sound/pci/rme9652/rme9652.c      |  3 +--
>  sound/pci/sis7019.c              |  5 +----
>  sound/pci/ymfpci/ymfpci_main.c   |  3 +--
>  sound/ppc/pmac.c                 | 15 +++++----------
>  26 files changed, 43 insertions(+), 90 deletions(-)
> 
> diff --git a/sound/aoa/soundbus/i2sbus/core.c b/sound/aoa/soundbus/i2sbus/core.c
> index 4e2b4fb..7835045 100644
> --- a/sound/aoa/soundbus/i2sbus/core.c
> +++ b/sound/aoa/soundbus/i2sbus/core.c
> @@ -74,10 +74,9 @@ static void i2sbus_release_dev(struct device *dev)
>  	int i;
>  
>  	i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
> -
> - 	if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
> - 	if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
> - 	if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
> +	iounmap(i2sdev->intfregs);
> +	iounmap(i2sdev->out.dbdma);
> +	iounmap(i2sdev->in.dbdma);
>  	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
>  		release_and_free_resource(i2sdev->allocated_resource[i]);
>  	free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
> @@ -318,9 +317,9 @@ static int i2sbus_add_dev(struct macio_dev *macio,
>  			free_irq(dev->interrupts[i], dev);
>  	free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
>  	free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
> -	if (dev->intfregs) iounmap(dev->intfregs);
> -	if (dev->out.dbdma) iounmap(dev->out.dbdma);
> -	if (dev->in.dbdma) iounmap(dev->in.dbdma);
> +	iounmap(dev->intfregs);
> +	iounmap(dev->out.dbdma);
> +	iounmap(dev->in.dbdma);
>  	for (i=0;i<3;i++)
>  		release_and_free_resource(dev->allocated_resource[i]);
>  	mutex_destroy(&dev->lock);
> diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c
> index 0e83a73..4140b1b 100644
> --- a/sound/arm/aaci.c
> +++ b/sound/arm/aaci.c
> @@ -889,8 +889,8 @@ static int aaci_probe_ac97(struct aaci *aaci)
>  static void aaci_free_card(struct snd_card *card)
>  {
>  	struct aaci *aaci = card->private_data;
> -	if (aaci->base)
> -		iounmap(aaci->base);
> +
> +	iounmap(aaci->base);
>  }
>  
>  static struct aaci *aaci_init_card(struct amba_device *dev)
> diff --git a/sound/drivers/ml403-ac97cr.c b/sound/drivers/ml403-ac97cr.c
> index ec01de1..bdcb572 100644
> --- a/sound/drivers/ml403-ac97cr.c
> +++ b/sound/drivers/ml403-ac97cr.c
> @@ -1094,8 +1094,7 @@ static int snd_ml403_ac97cr_free(struct snd_ml403_ac97cr *ml403_ac97cr)
>  	if (ml403_ac97cr->capture_irq >= 0)
>  		free_irq(ml403_ac97cr->capture_irq, ml403_ac97cr);
>  	/* give back "port" */
> -	if (ml403_ac97cr->port != NULL)
> -		iounmap(ml403_ac97cr->port);
> +	iounmap(ml403_ac97cr->port);
>  	kfree(ml403_ac97cr);
>  	PDEBUG(INIT_INFO, "free(): (done)\n");
>  	return 0;
> diff --git a/sound/isa/msnd/msnd_pinnacle.c b/sound/isa/msnd/msnd_pinnacle.c
> index 65b3682..4c07266 100644
> --- a/sound/isa/msnd/msnd_pinnacle.c
> +++ b/sound/isa/msnd/msnd_pinnacle.c
> @@ -627,8 +627,7 @@ static int snd_msnd_attach(struct snd_card *card)
>  	return 0;
>  
>  err_release_region:
> -	if (chip->mappedbase)
> -		iounmap(chip->mappedbase);
> +	iounmap(chip->mappedbase);
>  	release_mem_region(chip->base, BUFFSIZE);
>  	release_region(chip->io, DSP_NUMIO);
>  	free_irq(chip->irq, chip);
> diff --git a/sound/parisc/harmony.c b/sound/parisc/harmony.c
> index 29604a2..f2350c1 100644
> --- a/sound/parisc/harmony.c
> +++ b/sound/parisc/harmony.c
> @@ -893,9 +893,7 @@ snd_harmony_free(struct snd_harmony *h)
>  	if (h->irq >= 0)
>  		free_irq(h->irq, h);
>  
> -	if (h->iobase)
> -		iounmap(h->iobase);
> -
> +	iounmap(h->iobase);
>  	kfree(h);
>  	return 0;
>  }
> diff --git a/sound/pci/ad1889.c b/sound/pci/ad1889.c
> index 547ee30..0de3129 100644
> --- a/sound/pci/ad1889.c
> +++ b/sound/pci/ad1889.c
> @@ -853,12 +853,9 @@ snd_ad1889_free(struct snd_ad1889 *chip)
>  		free_irq(chip->irq, chip);
>  
>  skip_hw:
> -	if (chip->iobase)
> -		iounmap(chip->iobase);
> -
> +	iounmap(chip->iobase);
>  	pci_release_regions(chip->pci);
>  	pci_disable_device(chip->pci);
> -
>  	kfree(chip);
>  	return 0;
>  }
> diff --git a/sound/pci/asihpi/hpioctl.c b/sound/pci/asihpi/hpioctl.c
> index 72af66b..67d1133 100644
> --- a/sound/pci/asihpi/hpioctl.c
> +++ b/sound/pci/asihpi/hpioctl.c
> @@ -541,10 +541,8 @@ void asihpi_adapter_remove(struct pci_dev *pci_dev)
>  	hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
>  
>  	/* unmap PCI memory space, mapped during device init. */
> -	for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; idx++) {
> -		if (pci.ap_mem_base[idx])
> -			iounmap(pci.ap_mem_base[idx]);
> -	}
> +	for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; ++idx)
> +		iounmap(pci.ap_mem_base[idx]);
>  
>  	if (pa->irq)
>  		free_irq(pa->irq, pa);
> diff --git a/sound/pci/atiixp.c b/sound/pci/atiixp.c
> index 9c1c445..d24188f 100644
> --- a/sound/pci/atiixp.c
> +++ b/sound/pci/atiixp.c
> @@ -1585,8 +1585,7 @@ static int snd_atiixp_free(struct atiixp *chip)
>        __hw_end:
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, chip);
> -	if (chip->remap_addr)
> -		iounmap(chip->remap_addr);
> +	iounmap(chip->remap_addr);
>  	pci_release_regions(chip->pci);
>  	pci_disable_device(chip->pci);
>  	kfree(chip);
> diff --git a/sound/pci/atiixp_modem.c b/sound/pci/atiixp_modem.c
> index b2f63e0..c321a97 100644
> --- a/sound/pci/atiixp_modem.c
> +++ b/sound/pci/atiixp_modem.c
> @@ -1211,8 +1211,7 @@ static int snd_atiixp_free(struct atiixp_modem *chip)
>        __hw_end:
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, chip);
> -	if (chip->remap_addr)
> -		iounmap(chip->remap_addr);
> +	iounmap(chip->remap_addr);
>  	pci_release_regions(chip->pci);
>  	pci_disable_device(chip->pci);
>  	kfree(chip);
> diff --git a/sound/pci/aw2/aw2-alsa.c b/sound/pci/aw2/aw2-alsa.c
> index e1cf019..8d2fee7 100644
> --- a/sound/pci/aw2/aw2-alsa.c
> +++ b/sound/pci/aw2/aw2-alsa.c
> @@ -229,9 +229,7 @@ static int snd_aw2_dev_free(struct snd_device *device)
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, (void *)chip);
>  	/* release the i/o ports & memory */
> -	if (chip->iobase_virt)
> -		iounmap(chip->iobase_virt);
> -
> +	iounmap(chip->iobase_virt);
>  	pci_release_regions(chip->pci);
>  	/* disable the PCI entry */
>  	pci_disable_device(chip->pci);
> diff --git a/sound/pci/bt87x.c b/sound/pci/bt87x.c
> index 058b997..e82ceac 100644
> --- a/sound/pci/bt87x.c
> +++ b/sound/pci/bt87x.c
> @@ -690,8 +690,7 @@ static int snd_bt87x_free(struct snd_bt87x *chip)
>  		snd_bt87x_stop(chip);
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, chip);
> -	if (chip->mmio)
> -		iounmap(chip->mmio);
> +	iounmap(chip->mmio);
>  	pci_release_regions(chip->pci);
>  	pci_disable_device(chip->pci);
>  	kfree(chip);
> diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
> index 05a4337..ea33911 100644
> --- a/sound/pci/cs4281.c
> +++ b/sound/pci/cs4281.c
> @@ -1316,10 +1316,8 @@ static int snd_cs4281_free(struct cs4281 *chip)
>  
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, chip);
> -	if (chip->ba0)
> -		iounmap(chip->ba0);
> -	if (chip->ba1)
> -		iounmap(chip->ba1);
> +	iounmap(chip->ba0);
> +	iounmap(chip->ba1);
>  	pci_release_regions(chip->pci);
>  	pci_disable_device(chip->pci);
>  
> diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
> index dfec84e..128bbfe 100644
> --- a/sound/pci/cs46xx/cs46xx_lib.c
> +++ b/sound/pci/cs46xx/cs46xx_lib.c
> @@ -2949,8 +2949,8 @@ static int snd_cs46xx_free(struct snd_cs46xx *chip)
>  
>  	for (idx = 0; idx < 5; idx++) {
>  		struct snd_cs46xx_region *region = &chip->region.idx[idx];
> -		if (region->remap_addr)
> -			iounmap(region->remap_addr);
> +
> +		iounmap(region->remap_addr);
>  		release_and_free_resource(region->resource);
>  	}
>  
> diff --git a/sound/pci/ctxfi/cthw20k1.c b/sound/pci/ctxfi/cthw20k1.c
> index b425aa8..b8b0d8e 100644
> --- a/sound/pci/ctxfi/cthw20k1.c
> +++ b/sound/pci/ctxfi/cthw20k1.c
> @@ -1985,10 +1985,7 @@ static int hw_card_shutdown(struct hw *hw)
>  		free_irq(hw->irq, hw);
>  
>  	hw->irq	= -1;
> -
> -	if (hw->mem_base)
> -		iounmap(hw->mem_base);
> -
> +	iounmap(hw->mem_base);
>  	hw->mem_base = NULL;
>  
>  	if (hw->io_base)
> diff --git a/sound/pci/ctxfi/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
> index 253899d..4e16b4d 100644
> --- a/sound/pci/ctxfi/cthw20k2.c
> +++ b/sound/pci/ctxfi/cthw20k2.c
> @@ -2110,10 +2110,7 @@ static int hw_card_shutdown(struct hw *hw)
>  		free_irq(hw->irq, hw);
>  
>  	hw->irq	= -1;
> -
> -	if (hw->mem_base)
> -		iounmap(hw->mem_base);
> -
> +	iounmap(hw->mem_base);
>  	hw->mem_base = NULL;
>  
>  	if (hw->io_base)
> diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
> index 21228ad..98d4f35 100644
> --- a/sound/pci/echoaudio/echoaudio.c
> +++ b/sound/pci/echoaudio/echoaudio.c
> @@ -1872,12 +1872,8 @@ static int snd_echo_free(struct echoaudio *chip)
>  	if (chip->comm_page)
>  		snd_dma_free_pages(&chip->commpage_dma_buf);
>  
> -	if (chip->dsp_registers)
> -		iounmap(chip->dsp_registers);
> -
> +	iounmap(chip->dsp_registers);
>  	release_and_free_resource(chip->iores);
> -
> -
>  	pci_disable_device(chip->pci);
>  
>  	/* release chip data */
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index d426a0b..a971425 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -1138,8 +1138,7 @@ static int azx_free(struct azx *chip)
>  		free_irq(chip->irq, (void*)chip);
>  	if (chip->msi)
>  		pci_disable_msi(chip->pci);
> -	if (chip->remap_addr)
> -		iounmap(chip->remap_addr);
> +	iounmap(chip->remap_addr);
>  
>  	azx_free_stream_pages(chip);
>  	if (chip->region_requested)
> diff --git a/sound/pci/lola/lola.c b/sound/pci/lola/lola.c
> index 4cf4be5..9ff60008 100644
> --- a/sound/pci/lola/lola.c
> +++ b/sound/pci/lola/lola.c
> @@ -551,10 +551,8 @@ static void lola_free(struct lola *chip)
>  	lola_free_mixer(chip);
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, (void *)chip);
> -	if (chip->bar[0].remap_addr)
> -		iounmap(chip->bar[0].remap_addr);
> -	if (chip->bar[1].remap_addr)
> -		iounmap(chip->bar[1].remap_addr);
> +	iounmap(chip->bar[0].remap_addr);
> +	iounmap(chip->bar[1].remap_addr);
>  	if (chip->rb.area)
>  		snd_dma_free_pages(&chip->rb);
>  	pci_release_regions(chip->pci);
> diff --git a/sound/pci/mixart/mixart.c b/sound/pci/mixart/mixart.c
> index 1faf47e..c3a9f39 100644
> --- a/sound/pci/mixart/mixart.c
> +++ b/sound/pci/mixart/mixart.c
> @@ -1114,10 +1114,9 @@ static int snd_mixart_free(struct mixart_mgr *mgr)
>  	}
>  
>  	/* release the i/o ports */
> -	for (i = 0; i < 2; i++) {
> -		if (mgr->mem[i].virt)
> -			iounmap(mgr->mem[i].virt);
> -	}
> +	for (i = 0; i < 2; ++i)
> +		iounmap(mgr->mem[i].virt);
> +
>  	pci_release_regions(mgr->pci);
>  
>  	/* free flowarray */
> diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
> index 4e41a4e..3f52a44 100644
> --- a/sound/pci/nm256/nm256.c
> +++ b/sound/pci/nm256/nm256.c
> @@ -1460,10 +1460,8 @@ static int snd_nm256_free(struct nm256 *chip)
>  	if (chip->irq >= 0)
>  		free_irq(chip->irq, chip);
>  
> -	if (chip->cport)
> -		iounmap(chip->cport);
> -	if (chip->buffer)
> -		iounmap(chip->buffer);
> +	iounmap(chip->cport);
> +	iounmap(chip->buffer);
>  	release_and_free_resource(chip->res_cport);
>  	release_and_free_resource(chip->res_buffer);
>  
> diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
> index cf5a6c8..fe66bcb 100644
> --- a/sound/pci/rme9652/hdsp.c
> +++ b/sound/pci/rme9652/hdsp.c
> @@ -5309,9 +5309,7 @@ static int snd_hdsp_free(struct hdsp *hdsp)
>  
>  	release_firmware(hdsp->firmware);
>  	vfree(hdsp->fw_uploaded);
> -
> -	if (hdsp->iobase)
> -		iounmap(hdsp->iobase);
> +	iounmap(hdsp->iobase);
>  
>  	if (hdsp->port)
>  		pci_release_regions(hdsp->pci);
> diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
> index 3342705..8109b8e 100644
> --- a/sound/pci/rme9652/hdspm.c
> +++ b/sound/pci/rme9652/hdspm.c
> @@ -6965,9 +6965,7 @@ static int snd_hdspm_free(struct hdspm * hdspm)
>  		free_irq(hdspm->irq, (void *) hdspm);
>  
>  	kfree(hdspm->mixer);
> -
> -	if (hdspm->iobase)
> -		iounmap(hdspm->iobase);
> +	iounmap(hdspm->iobase);
>  
>  	if (hdspm->port)
>  		pci_release_regions(hdspm->pci);
> diff --git a/sound/pci/rme9652/rme9652.c b/sound/pci/rme9652/rme9652.c
> index 6521521..648911c 100644
> --- a/sound/pci/rme9652/rme9652.c
> +++ b/sound/pci/rme9652/rme9652.c
> @@ -1756,8 +1756,7 @@ static int snd_rme9652_free(struct snd_rme9652 *rme9652)
>  
>  	if (rme9652->irq >= 0)
>  		free_irq(rme9652->irq, (void *)rme9652);
> -	if (rme9652->iobase)
> -		iounmap(rme9652->iobase);
> +	iounmap(rme9652->iobase);
>  	if (rme9652->port)
>  		pci_release_regions(rme9652->pci);
>  
> diff --git a/sound/pci/sis7019.c b/sound/pci/sis7019.c
> index 7f6a0a0..5e9437b 100644
> --- a/sound/pci/sis7019.c
> +++ b/sound/pci/sis7019.c
> @@ -1064,12 +1064,9 @@ static int sis_chip_free(struct sis7019 *sis)
>  	if (sis->irq >= 0)
>  		free_irq(sis->irq, sis);
>  
> -	if (sis->ioaddr)
> -		iounmap(sis->ioaddr);
> -
> +	iounmap(sis->ioaddr);
>  	pci_release_regions(sis->pci);
>  	pci_disable_device(sis->pci);
> -
>  	sis_free_suspend(sis);
>  	return 0;
>  }
> diff --git a/sound/pci/ymfpci/ymfpci_main.c b/sound/pci/ymfpci/ymfpci_main.c
> index f5581a9..de7f06f 100644
> --- a/sound/pci/ymfpci/ymfpci_main.c
> +++ b/sound/pci/ymfpci/ymfpci_main.c
> @@ -2246,8 +2246,7 @@ static int snd_ymfpci_free(struct snd_ymfpci *chip)
>  	release_and_free_resource(chip->mpu_res);
>  	release_and_free_resource(chip->fm_res);
>  	snd_ymfpci_free_gameport(chip);
> -	if (chip->reg_area_virt)
> -		iounmap(chip->reg_area_virt);
> +	iounmap(chip->reg_area_virt);
>  	if (chip->work_ptr.area)
>  		snd_dma_free_pages(&chip->work_ptr);
>  	
> diff --git a/sound/ppc/pmac.c b/sound/ppc/pmac.c
> index 5a13b22..d399df4 100644
> --- a/sound/ppc/pmac.c
> +++ b/sound/ppc/pmac.c
> @@ -867,16 +867,11 @@ static int snd_pmac_free(struct snd_pmac *chip)
>  	snd_pmac_dbdma_free(chip, &chip->capture.cmd);
>  	snd_pmac_dbdma_free(chip, &chip->extra_dma);
>  	snd_pmac_dbdma_free(chip, &emergency_dbdma);
> -	if (chip->macio_base)
> -		iounmap(chip->macio_base);
> -	if (chip->latch_base)
> -		iounmap(chip->latch_base);
> -	if (chip->awacs)
> -		iounmap(chip->awacs);
> -	if (chip->playback.dma)
> -		iounmap(chip->playback.dma);
> -	if (chip->capture.dma)
> -		iounmap(chip->capture.dma);
> +	iounmap(chip->macio_base);
> +	iounmap(chip->latch_base);
> +	iounmap(chip->awacs);
> +	iounmap(chip->playback.dma);
> +	iounmap(chip->capture.dma);
>  
>  	if (chip->node) {
>  		int i;
> -- 
> 2.2.1
> 
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