[PATCH v3 1/3] [media] coda: Fix error paths

[PATCH v3 1/3] [media] coda: Fix error paths

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

Some resources were not being released in the error path and some were released
in the incorrect order.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
Changes since v2:
- Newly introduced in this series

 drivers/media/platform/coda.c | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index df4ada88..ea16c20 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -1514,15 +1514,17 @@ static int coda_open(struct file *file)
 	int ret = 0;
 	int idx;
 
-	idx = coda_next_free_instance(dev);
-	if (idx >= CODA_MAX_INSTANCES)
-		return -EBUSY;
-	set_bit(idx, &dev->instance_mask);
-
 	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
 
+	idx = coda_next_free_instance(dev);
+	if (idx >= CODA_MAX_INSTANCES) {
+		ret =  -EBUSY;
+		goto err_coda_max;
+	}
+	set_bit(idx, &dev->instance_mask);
+
 	v4l2_fh_init(&ctx->fh, video_devdata(file));
 	file->private_data = &ctx->fh;
 	v4l2_fh_add(&ctx->fh);
@@ -1537,12 +1539,12 @@ static int coda_open(struct file *file)
 
 		v4l2_err(&dev->v4l2_dev, "%s return error (%d)\n",
 			 __func__, ret);
-		goto err;
+		goto err_ctx_init;
 	}
 	ret = coda_ctrls_setup(ctx);
 	if (ret) {
 		v4l2_err(&dev->v4l2_dev, "failed to setup coda controls\n");
-		goto err;
+		goto err_ctrls_setup;
 	}
 
 	ctx->fh.ctrl_handler = &ctx->ctrls;
@@ -1552,7 +1554,7 @@ static int coda_open(struct file *file)
 	if (!ctx->parabuf.vaddr) {
 		v4l2_err(&dev->v4l2_dev, "failed to allocate parabuf");
 		ret = -ENOMEM;
-		goto err;
+		goto err_dma_alloc;
 	}
 
 	coda_lock(ctx);
@@ -1567,9 +1569,15 @@ static int coda_open(struct file *file)
 
 	return 0;
 
-err:
+err_dma_alloc:
+	v4l2_ctrl_handler_free(&ctx->ctrls);
+err_ctrls_setup:
+	v4l2_m2m_ctx_release(ctx->m2m_ctx);
+err_ctx_init:
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);
+	clear_bit(ctx->idx, &dev->instance_mask);
+err_coda_max:
 	kfree(ctx);
 	return ret;
 }
@@ -1582,16 +1590,16 @@ static int coda_release(struct file *file)
 	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "Releasing instance %p\n",
 		 ctx);
 
+	clk_disable_unprepare(dev->clk_ahb);
+	clk_disable_unprepare(dev->clk_per);
 	coda_lock(ctx);
 	list_del(&ctx->list);
 	coda_unlock(ctx);
 
 	dma_free_coherent(&dev->plat_dev->dev, CODA_PARA_BUF_SIZE,
 		ctx->parabuf.vaddr, ctx->parabuf.paddr);
-	v4l2_m2m_ctx_release(ctx->m2m_ctx);
 	v4l2_ctrl_handler_free(&ctx->ctrls);
-	clk_disable_unprepare(dev->clk_per);
-	clk_disable_unprepare(dev->clk_ahb);
+	v4l2_m2m_ctx_release(ctx->m2m_ctx);
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);
 	clear_bit(ctx->idx, &dev->instance_mask);
-- 
1.8.1.2

[PATCH v3 2/3] [media] coda: Check the return value from clk_prepare_enable()

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

clk_prepare_enable() may fail, so let's check its return value and propagate it
in the case of error.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
- Changes since v2:
- Release the previously acquired resources
Changes since v1:
- Add missing 'if'

 drivers/media/platform/coda.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index ea16c20..5f15aaa 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -1561,14 +1561,27 @@ static int coda_open(struct file *file)
 	list_add(&ctx->list, &dev->instances);
 	coda_unlock(ctx);
 
-	clk_prepare_enable(dev->clk_per);
-	clk_prepare_enable(dev->clk_ahb);
+	ret = clk_prepare_enable(dev->clk_per);
+	if (ret)
+		goto err_clk_per;
+
+	ret = clk_prepare_enable(dev->clk_ahb);
+	if (ret)
+		goto err_clk_ahb;
 
 	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "Created instance %d (%p)\n",
 		 ctx->idx, ctx);
 
 	return 0;
 
+err_clk_ahb:
+	clk_disable_unprepare(dev->clk_per);
+err_clk_per:
+	coda_lock(ctx);
+	list_del(&ctx->list);
+	coda_unlock(ctx);
+	dma_free_coherent(&dev->plat_dev->dev, CODA_PARA_BUF_SIZE,
+			  ctx->parabuf.vaddr, ctx->parabuf.paddr);
 err_dma_alloc:
 	v4l2_ctrl_handler_free(&ctx->ctrls);
 err_ctrls_setup:
-- 
1.8.1.2

Re: [PATCH v3 2/3] [media] coda: Check the return value from clk_prepare_enable()

[Philipp Zabel]

Hi Fabio,

Am Montag, den 22.07.2013, 22:38 -0300 schrieb Fabio Estevam:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> clk_prepare_enable() may fail, so let's check its return value and propagate it
> in the case of error.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
> - Changes since v2:
> - Release the previously acquired resources
> Changes since v1:
> - Add missing 'if'
> 
>  drivers/media/platform/coda.c | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
> index ea16c20..5f15aaa 100644
> --- a/drivers/media/platform/coda.c
> +++ b/drivers/media/platform/coda.c
> @@ -1561,14 +1561,27 @@ static int coda_open(struct file *file)
>  	list_add(&ctx->list, &dev->instances);
>  	coda_unlock(ctx);
>  
> -	clk_prepare_enable(dev->clk_per);
> -	clk_prepare_enable(dev->clk_ahb);
> +	ret = clk_prepare_enable(dev->clk_per);
> +	if (ret)
> +		goto err_clk_per;
> +
> +	ret = clk_prepare_enable(dev->clk_ahb);
> +	if (ret)
> +		goto err_clk_ahb;
>  
>  	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "Created instance %d (%p)\n",
>  		 ctx->idx, ctx);
>  
>  	return 0;
>  
> +err_clk_ahb:
> +	clk_disable_unprepare(dev->clk_per);
> +err_clk_per:
> +	coda_lock(ctx);
> +	list_del(&ctx->list);
> +	coda_unlock(ctx);
> +	dma_free_coherent(&dev->plat_dev->dev, CODA_PARA_BUF_SIZE,
> +			  ctx->parabuf.vaddr, ctx->parabuf.paddr);
>  err_dma_alloc:
>  	v4l2_ctrl_handler_free(&ctx->ctrls);
>  err_ctrls_setup:

I still think the list_add() should be moved after the last possible
error case and the lock/list_del/unlock should be removed from the error
path.

regards
Philipp

[PATCH v3 3/3] [media] coda: No need to check the return value of platform_get_resource()

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam@freescale.com>

When using devm_ioremap_resource(), we do not need to check the return value of
platform_get_resource(), so just remove it.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
Changes since v2:
- None
Changes since v1:
- None

 drivers/media/platform/coda.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index 5f15aaa..78c9236 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -2053,11 +2053,6 @@ static int coda_probe(struct platform_device *pdev)
 
 	/* Get  memory for physical registers */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res == NULL) {
-		dev_err(&pdev->dev, "failed to get memory region resource\n");
-		return -ENOENT;
-	}
-
 	dev->regs_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(dev->regs_base))
 		return PTR_ERR(dev->regs_base);
-- 
1.8.1.2

Re: [PATCH v3 1/3] [media] coda: Fix error paths

[Philipp Zabel]

Hi Fabio,

Am Montag, den 22.07.2013, 22:38 -0300 schrieb Fabio Estevam:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> Some resources were not being released in the error path and some were released
> in the incorrect order.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
> Changes since v2:
> - Newly introduced in this series
> 
>  drivers/media/platform/coda.c | 32 ++++++++++++++++++++------------
>  1 file changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
> index df4ada88..ea16c20 100644
> --- a/drivers/media/platform/coda.c
> +++ b/drivers/media/platform/coda.c
> @@ -1514,15 +1514,17 @@ static int coda_open(struct file *file)
>  	int ret = 0;
>  	int idx;
>  
> -	idx = coda_next_free_instance(dev);
> -	if (idx >= CODA_MAX_INSTANCES)
> -		return -EBUSY;
> -	set_bit(idx, &dev->instance_mask);
> -
>  	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
>  	if (!ctx)
>  		return -ENOMEM;
>  
> +	idx = coda_next_free_instance(dev);
> +	if (idx >= CODA_MAX_INSTANCES) {
> +		ret =  -EBUSY;
> +		goto err_coda_max;
> +	}
> +	set_bit(idx, &dev->instance_mask);
> +
>  	v4l2_fh_init(&ctx->fh, video_devdata(file));
>  	file->private_data = &ctx->fh;
>  	v4l2_fh_add(&ctx->fh);
> @@ -1537,12 +1539,12 @@ static int coda_open(struct file *file)
>  
>  		v4l2_err(&dev->v4l2_dev, "%s return error (%d)\n",
>  			 __func__, ret);
> -		goto err;
> +		goto err_ctx_init;
>  	}
>  	ret = coda_ctrls_setup(ctx);
>  	if (ret) {
>  		v4l2_err(&dev->v4l2_dev, "failed to setup coda controls\n");
> -		goto err;
> +		goto err_ctrls_setup;
>  	}
>  
>  	ctx->fh.ctrl_handler = &ctx->ctrls;
> @@ -1552,7 +1554,7 @@ static int coda_open(struct file *file)
>  	if (!ctx->parabuf.vaddr) {
>  		v4l2_err(&dev->v4l2_dev, "failed to allocate parabuf");
>  		ret = -ENOMEM;
> -		goto err;
> +		goto err_dma_alloc;
>  	}
>  
>  	coda_lock(ctx);
> @@ -1567,9 +1569,15 @@ static int coda_open(struct file *file)
>  
>  	return 0;
>  
> -err:
> +err_dma_alloc:
> +	v4l2_ctrl_handler_free(&ctx->ctrls);
> +err_ctrls_setup:
> +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> +err_ctx_init:
>  	v4l2_fh_del(&ctx->fh);
>  	v4l2_fh_exit(&ctx->fh);
> +	clear_bit(ctx->idx, &dev->instance_mask);
> +err_coda_max:
>  	kfree(ctx);
>  	return ret;
>  }
> @@ -1582,16 +1590,16 @@ static int coda_release(struct file *file)
>  	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "Releasing instance %p\n",
>  		 ctx);
>  
> +	clk_disable_unprepare(dev->clk_ahb);
> +	clk_disable_unprepare(dev->clk_per);
>  	coda_lock(ctx);
>  	list_del(&ctx->list);
>  	coda_unlock(ctx);
>  
>  	dma_free_coherent(&dev->plat_dev->dev, CODA_PARA_BUF_SIZE,
>  		ctx->parabuf.vaddr, ctx->parabuf.paddr);
> -	v4l2_m2m_ctx_release(ctx->m2m_ctx);
>  	v4l2_ctrl_handler_free(&ctx->ctrls);
> -	clk_disable_unprepare(dev->clk_per);
> -	clk_disable_unprepare(dev->clk_ahb);
> +	v4l2_m2m_ctx_release(ctx->m2m_ctx);

the clocks must not be disabled until after v4l2_m2m_ctx_release
returns: this function might wait for the currently running job to
finish.

>  	v4l2_fh_del(&ctx->fh);
>  	v4l2_fh_exit(&ctx->fh);
>  	clear_bit(ctx->idx, &dev->instance_mask);

regards
Philipp