[PATCH] dmaengine: bestcomm: ioremap early

[PATCH] dmaengine: bestcomm: ioremap early

[Rosen Penev]

Doing so allows handling potential -EPROBE_DEFER before any work gets
done.

Replace the open-coded resource lookup, request_mem_region, ioremap and
the manual iounmap/release_mem_region cleanup in probe/remove with the
managed devm_platform_get_and_ioremap_resource() helper. This removes the
now-unused error-unmap/release paths and simplifies probing.

This also fixes a resource size mismatch between allocating and freeing.
From sashiko:

>  	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));

This is a pre-existing issue, but does this mismatch in size during release
cause a permanent resource leak?
The memory region is requested earlier in mpc52xx_bcom_probe() using the
device tree node size:
    if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
                            DRIVER_NAME)) {
However, the error path above attempts to release the region using a fixed
compile-time size: sizeof(struct mpc52xx_sdma). Since __release_region()
strictly verifies the boundaries of the requested resource, if these sizes
differ, the check fails and the I/O memory region is never freed. Driver
unbinding in mpc52xx_bcom_remove() also uses this same fixed size.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/dma/bestcomm/bestcomm.c | 45 ++++++++-------------------------
 1 file changed, 10 insertions(+), 35 deletions(-)

diff --git a/drivers/dma/bestcomm/bestcomm.c b/drivers/dma/bestcomm/bestcomm.c
index 432b43520ddc..44ff4a42376b 100644
--- a/drivers/dma/bestcomm/bestcomm.c
+++ b/drivers/dma/bestcomm/bestcomm.c
@@ -13,7 +13,6 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <asm/io.h>
@@ -365,13 +364,19 @@ bcom_engine_cleanup(void)
 static int mpc52xx_bcom_probe(struct platform_device *op)
 {
 	struct device_node *ofn_sram;
-	struct resource res_bcom;
+	struct resource *res_bcom;
+	void __iomem *regs;
 
 	int rv;
 
 	/* Inform user we're ok so far */
 	printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
 
+	/* Get, reserve & map io */
+	regs = devm_platform_get_and_ioremap_resource(op, 0, &res_bcom);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
 	/* Get the bestcomm node */
 	of_node_get(op->dev.of_node);
 
@@ -402,35 +407,13 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
 	/* Save the node */
 	bcom_eng->ofnode = op->dev.of_node;
 
-	/* Get, reserve & map io */
-	if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
-		printk(KERN_ERR DRIVER_NAME ": "
-			"Can't get resource\n");
-		rv = -EINVAL;
-		goto error_sramclean;
-	}
-
-	if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
-				DRIVER_NAME)) {
-		printk(KERN_ERR DRIVER_NAME ": "
-			"Can't request registers region\n");
-		rv = -EBUSY;
-		goto error_sramclean;
-	}
-
-	bcom_eng->regs_base = res_bcom.start;
-	bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
-	if (!bcom_eng->regs) {
-		printk(KERN_ERR DRIVER_NAME ": "
-			"Can't map registers\n");
-		rv = -ENOMEM;
-		goto error_release;
-	}
+	bcom_eng->regs = regs;
+	bcom_eng->regs_base = res_bcom->start;
 
 	/* Now, do the real init */
 	rv = bcom_engine_init();
 	if (rv)
-		goto error_unmap;
+		goto error_sramclean;
 
 	/* Done ! */
 	printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
@@ -439,10 +422,6 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
 	return 0;
 
 	/* Error path */
-error_unmap:
-	iounmap(bcom_eng->regs);
-error_release:
-	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
 error_sramclean:
 	kfree(bcom_eng);
 	bcom_sram_cleanup();
@@ -463,10 +442,6 @@ static void mpc52xx_bcom_remove(struct platform_device *op)
 	/* Cleanup SRAM */
 	bcom_sram_cleanup();
 
-	/* Release regs */
-	iounmap(bcom_eng->regs);
-	release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
-
 	/* Release the node */
 	of_node_put(bcom_eng->ofnode);
 
-- 
2.55.0

Re: [PATCH] dmaengine: bestcomm: ioremap early

[Markus Elfring]

…
> This also fixes a resource size mismatch between allocating and freeing.
> From sashiko:
> 
> >  	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
> 
> This is a pre-existing issue, but does this mismatch in size during release
> cause a permanent resource leak?
…
> ---
>  drivers/dma/bestcomm/bestcomm.c | 45 ++++++++-------------------------
…

I would prefer a clearer separation between manual descriptions
and tool-generated data.
Can quoting styles be improved accordingly?

Regards,
Markus

Re: [PATCH] dmaengine: bestcomm: ioremap early

[Rosen Penev]

On Sun, Aug 23, 2026 at 1:00 AM Markus Elfring <Markus.Elfring@web.de> wrote:
>
> …
> > This also fixes a resource size mismatch between allocating and freeing.
> > From sashiko:
> >
> > >     release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
> >
> > This is a pre-existing issue, but does this mismatch in size during release
> > cause a permanent resource leak?
> …
> > ---
> >  drivers/dma/bestcomm/bestcomm.c | 45 ++++++++-------------------------
> …
>
> I would prefer a clearer separation between manual descriptions
> and tool-generated data.
> Can quoting styles be improved accordingly?
what do you have in mind?
>
> Regards,
> Markus

Re: dmaengine: bestcomm: ioremap early

[Markus Elfring]

>> I would prefer a clearer separation between manual descriptions
>> and tool-generated data.
>> Can quoting styles be improved accordingly?
> what do you have in mind?
Some possibilities are known already for this purpose.
https://en.wikipedia.org/wiki/Quotation
https://en.wikipedia.org/wiki/Nested_quotation

Will markings be added to selected text parts?

Regards,
Markus

Re: [PATCH] dmaengine: bestcomm: ioremap early

[Frank Li]

On Sat, Aug 22, 2026 at 09:49:00PM -0700, Rosen Penev wrote:

subject: dmaengine: bestcomm: use devm_platform_get_and_ioremap_resource() to simplify code


> Doing so allows handling potential -EPROBE_DEFER before any work gets
> done.
>
> Replace the open-coded resource lookup, request_mem_region, ioremap and
> the manual iounmap/release_mem_region cleanup in probe/remove with the
> managed devm_platform_get_and_ioremap_resource() helper. This removes the
> now-unused error-unmap/release paths and simplifies probing.
>
> This also fixes a resource size mismatch between allocating and freeing.
> From sashiko:
>
> >  	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
>
> This is a pre-existing issue, but does this mismatch in size during release
> cause a permanent resource leak?

%s/?/.

> The memory region is requested earlier in mpc52xx_bcom_probe() using the
> device tree node size:
>     if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
>                             DRIVER_NAME)) {
> However, the error path above attempts to release the region using a fixed
> compile-time size: sizeof(struct mpc52xx_sdma). Since __release_region()
> strictly verifies the boundaries of the requested resource, if these sizes
> differ, the check fails and the I/O memory region is never freed. Driver
> unbinding in mpc52xx_bcom_remove() also uses this same fixed size.

Needn't this paragraph, "devm_platform_get_and_ioremap_resource..." already
clear enough.

Frank

>
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>  drivers/dma/bestcomm/bestcomm.c | 45 ++++++++-------------------------
>  1 file changed, 10 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/dma/bestcomm/bestcomm.c b/drivers/dma/bestcomm/bestcomm.c
> index 432b43520ddc..44ff4a42376b 100644
> --- a/drivers/dma/bestcomm/bestcomm.c
> +++ b/drivers/dma/bestcomm/bestcomm.c
> @@ -13,7 +13,6 @@
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
>  #include <linux/of.h>
> -#include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  #include <linux/platform_device.h>
>  #include <asm/io.h>
> @@ -365,13 +364,19 @@ bcom_engine_cleanup(void)
>  static int mpc52xx_bcom_probe(struct platform_device *op)
>  {
>  	struct device_node *ofn_sram;
> -	struct resource res_bcom;
> +	struct resource *res_bcom;
> +	void __iomem *regs;
>
>  	int rv;
>
>  	/* Inform user we're ok so far */
>  	printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
>
> +	/* Get, reserve & map io */
> +	regs = devm_platform_get_and_ioremap_resource(op, 0, &res_bcom);
> +	if (IS_ERR(regs))
> +		return PTR_ERR(regs);
> +
>  	/* Get the bestcomm node */
>  	of_node_get(op->dev.of_node);
>
> @@ -402,35 +407,13 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
>  	/* Save the node */
>  	bcom_eng->ofnode = op->dev.of_node;
>
> -	/* Get, reserve & map io */
> -	if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
> -		printk(KERN_ERR DRIVER_NAME ": "
> -			"Can't get resource\n");
> -		rv = -EINVAL;
> -		goto error_sramclean;
> -	}
> -
> -	if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
> -				DRIVER_NAME)) {
> -		printk(KERN_ERR DRIVER_NAME ": "
> -			"Can't request registers region\n");
> -		rv = -EBUSY;
> -		goto error_sramclean;
> -	}
> -
> -	bcom_eng->regs_base = res_bcom.start;
> -	bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
> -	if (!bcom_eng->regs) {
> -		printk(KERN_ERR DRIVER_NAME ": "
> -			"Can't map registers\n");
> -		rv = -ENOMEM;
> -		goto error_release;
> -	}
> +	bcom_eng->regs = regs;
> +	bcom_eng->regs_base = res_bcom->start;
>
>  	/* Now, do the real init */
>  	rv = bcom_engine_init();
>  	if (rv)
> -		goto error_unmap;
> +		goto error_sramclean;
>
>  	/* Done ! */
>  	printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
> @@ -439,10 +422,6 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
>  	return 0;
>
>  	/* Error path */
> -error_unmap:
> -	iounmap(bcom_eng->regs);
> -error_release:
> -	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
>  error_sramclean:
>  	kfree(bcom_eng);
>  	bcom_sram_cleanup();
> @@ -463,10 +442,6 @@ static void mpc52xx_bcom_remove(struct platform_device *op)
>  	/* Cleanup SRAM */
>  	bcom_sram_cleanup();
>
> -	/* Release regs */
> -	iounmap(bcom_eng->regs);
> -	release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
> -
>  	/* Release the node */
>  	of_node_put(bcom_eng->ofnode);
>
> --
> 2.55.0
>

Re: [PATCH] dmaengine: bestcomm: ioremap early

[Rosen Penev]

On Mon, Aug 24, 2026 at 8:25 AM Frank Li <Frank.li@oss.nxp.com> wrote:
>
> On Sat, Aug 22, 2026 at 09:49:00PM -0700, Rosen Penev wrote:
>
> subject: dmaengine: bestcomm: use devm_platform_get_and_ioremap_resource() to simplify code
>
>
> > Doing so allows handling potential -EPROBE_DEFER before any work gets
> > done.
> >
> > Replace the open-coded resource lookup, request_mem_region, ioremap and
> > the manual iounmap/release_mem_region cleanup in probe/remove with the
> > managed devm_platform_get_and_ioremap_resource() helper. This removes the
> > now-unused error-unmap/release paths and simplifies probing.
> >
> > This also fixes a resource size mismatch between allocating and freeing.
> > From sashiko:
> >
> > >     release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
> >
> > This is a pre-existing issue, but does this mismatch in size during release
> > cause a permanent resource leak?
>
> %s/?/.
>
> > The memory region is requested earlier in mpc52xx_bcom_probe() using the
> > device tree node size:
> >     if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
> >                             DRIVER_NAME)) {
> > However, the error path above attempts to release the region using a fixed
> > compile-time size: sizeof(struct mpc52xx_sdma). Since __release_region()
> > strictly verifies the boundaries of the requested resource, if these sizes
> > differ, the check fails and the I/O memory region is never freed. Driver
> > unbinding in mpc52xx_bcom_remove() also uses this same fixed size.
>
> Needn't this paragraph, "devm_platform_get_and_ioremap_resource..." already
> clear enough.
This section is generated from Sashiko. Same as the above.
>
> Frank
>
> >
> > Signed-off-by: Rosen Penev <rosenp@gmail.com>
> > ---
> >  drivers/dma/bestcomm/bestcomm.c | 45 ++++++++-------------------------
> >  1 file changed, 10 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/dma/bestcomm/bestcomm.c b/drivers/dma/bestcomm/bestcomm.c
> > index 432b43520ddc..44ff4a42376b 100644
> > --- a/drivers/dma/bestcomm/bestcomm.c
> > +++ b/drivers/dma/bestcomm/bestcomm.c
> > @@ -13,7 +13,6 @@
> >  #include <linux/kernel.h>
> >  #include <linux/slab.h>
> >  #include <linux/of.h>
> > -#include <linux/of_address.h>
> >  #include <linux/of_irq.h>
> >  #include <linux/platform_device.h>
> >  #include <asm/io.h>
> > @@ -365,13 +364,19 @@ bcom_engine_cleanup(void)
> >  static int mpc52xx_bcom_probe(struct platform_device *op)
> >  {
> >       struct device_node *ofn_sram;
> > -     struct resource res_bcom;
> > +     struct resource *res_bcom;
> > +     void __iomem *regs;
> >
> >       int rv;
> >
> >       /* Inform user we're ok so far */
> >       printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
> >
> > +     /* Get, reserve & map io */
> > +     regs = devm_platform_get_and_ioremap_resource(op, 0, &res_bcom);
> > +     if (IS_ERR(regs))
> > +             return PTR_ERR(regs);
> > +
> >       /* Get the bestcomm node */
> >       of_node_get(op->dev.of_node);
> >
> > @@ -402,35 +407,13 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
> >       /* Save the node */
> >       bcom_eng->ofnode = op->dev.of_node;
> >
> > -     /* Get, reserve & map io */
> > -     if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
> > -             printk(KERN_ERR DRIVER_NAME ": "
> > -                     "Can't get resource\n");
> > -             rv = -EINVAL;
> > -             goto error_sramclean;
> > -     }
> > -
> > -     if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
> > -                             DRIVER_NAME)) {
> > -             printk(KERN_ERR DRIVER_NAME ": "
> > -                     "Can't request registers region\n");
> > -             rv = -EBUSY;
> > -             goto error_sramclean;
> > -     }
> > -
> > -     bcom_eng->regs_base = res_bcom.start;
> > -     bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
> > -     if (!bcom_eng->regs) {
> > -             printk(KERN_ERR DRIVER_NAME ": "
> > -                     "Can't map registers\n");
> > -             rv = -ENOMEM;
> > -             goto error_release;
> > -     }
> > +     bcom_eng->regs = regs;
> > +     bcom_eng->regs_base = res_bcom->start;
> >
> >       /* Now, do the real init */
> >       rv = bcom_engine_init();
> >       if (rv)
> > -             goto error_unmap;
> > +             goto error_sramclean;
> >
> >       /* Done ! */
> >       printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
> > @@ -439,10 +422,6 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
> >       return 0;
> >
> >       /* Error path */
> > -error_unmap:
> > -     iounmap(bcom_eng->regs);
> > -error_release:
> > -     release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
> >  error_sramclean:
> >       kfree(bcom_eng);
> >       bcom_sram_cleanup();
> > @@ -463,10 +442,6 @@ static void mpc52xx_bcom_remove(struct platform_device *op)
> >       /* Cleanup SRAM */
> >       bcom_sram_cleanup();
> >
> > -     /* Release regs */
> > -     iounmap(bcom_eng->regs);
> > -     release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
> > -
> >       /* Release the node */
> >       of_node_put(bcom_eng->ofnode);
> >
> > --
> > 2.55.0
> >

Re: [PATCH] dmaengine: bestcomm: ioremap early

[Frank Li]

On Mon, Aug 24, 2026 at 01:24:06PM -0700, Rosen Penev wrote:
> On Mon, Aug 24, 2026 at 8:25 AM Frank Li <Frank.li@oss.nxp.com> wrote:
> >
> > On Sat, Aug 22, 2026 at 09:49:00PM -0700, Rosen Penev wrote:
> >
> > subject: dmaengine: bestcomm: use devm_platform_get_and_ioremap_resource() to simplify code
> >
> >
> > > Doing so allows handling potential -EPROBE_DEFER before any work gets
> > > done.
> > >
> > > Replace the open-coded resource lookup, request_mem_region, ioremap and
> > > the manual iounmap/release_mem_region cleanup in probe/remove with the
> > > managed devm_platform_get_and_ioremap_resource() helper. This removes the
> > > now-unused error-unmap/release paths and simplifies probing.
> > >
> > > This also fixes a resource size mismatch between allocating and freeing.
> > > From sashiko:
> > >
> > > >     release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
> > >
> > > This is a pre-existing issue, but does this mismatch in size during release
> > > cause a permanent resource leak?
> >
> > %s/?/.
> >
> > > The memory region is requested earlier in mpc52xx_bcom_probe() using the
> > > device tree node size:
> > >     if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
> > >                             DRIVER_NAME)) {
> > > However, the error path above attempts to release the region using a fixed
> > > compile-time size: sizeof(struct mpc52xx_sdma). Since __release_region()
> > > strictly verifies the boundaries of the requested resource, if these sizes
> > > differ, the check fails and the I/O memory region is never freed. Driver
> > > unbinding in mpc52xx_bcom_remove() also uses this same fixed size.
> >
> > Needn't this paragraph, "devm_platform_get_and_ioremap_resource..." already
> > clear enough.
> This section is generated from Sashiko. Same as the above.

AI provided more detail information to help us understand situation, but
sometime it is long-winded.  Git commit need a nice summary. This is
simple code cleanup.

Frank

> >
> > Frank
> >
> > >
> > > Signed-off-by: Rosen Penev <rosenp@gmail.com>
> > > ---
> > >  drivers/dma/bestcomm/bestcomm.c | 45 ++++++++-------------------------
> > >  1 file changed, 10 insertions(+), 35 deletions(-)
> > >
> > > diff --git a/drivers/dma/bestcomm/bestcomm.c b/drivers/dma/bestcomm/bestcomm.c
> > > index 432b43520ddc..44ff4a42376b 100644
> > > --- a/drivers/dma/bestcomm/bestcomm.c
> > > +++ b/drivers/dma/bestcomm/bestcomm.c
> > > @@ -13,7 +13,6 @@
> > >  #include <linux/kernel.h>
> > >  #include <linux/slab.h>
> > >  #include <linux/of.h>
> > > -#include <linux/of_address.h>
> > >  #include <linux/of_irq.h>
> > >  #include <linux/platform_device.h>
> > >  #include <asm/io.h>
> > > @@ -365,13 +364,19 @@ bcom_engine_cleanup(void)
> > >  static int mpc52xx_bcom_probe(struct platform_device *op)
> > >  {
> > >       struct device_node *ofn_sram;
> > > -     struct resource res_bcom;
> > > +     struct resource *res_bcom;
> > > +     void __iomem *regs;
> > >
> > >       int rv;
> > >
> > >       /* Inform user we're ok so far */
> > >       printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
> > >
> > > +     /* Get, reserve & map io */
> > > +     regs = devm_platform_get_and_ioremap_resource(op, 0, &res_bcom);
> > > +     if (IS_ERR(regs))
> > > +             return PTR_ERR(regs);
> > > +
> > >       /* Get the bestcomm node */
> > >       of_node_get(op->dev.of_node);
> > >
> > > @@ -402,35 +407,13 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
> > >       /* Save the node */
> > >       bcom_eng->ofnode = op->dev.of_node;
> > >
> > > -     /* Get, reserve & map io */
> > > -     if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
> > > -             printk(KERN_ERR DRIVER_NAME ": "
> > > -                     "Can't get resource\n");
> > > -             rv = -EINVAL;
> > > -             goto error_sramclean;
> > > -     }
> > > -
> > > -     if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
> > > -                             DRIVER_NAME)) {
> > > -             printk(KERN_ERR DRIVER_NAME ": "
> > > -                     "Can't request registers region\n");
> > > -             rv = -EBUSY;
> > > -             goto error_sramclean;
> > > -     }
> > > -
> > > -     bcom_eng->regs_base = res_bcom.start;
> > > -     bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
> > > -     if (!bcom_eng->regs) {
> > > -             printk(KERN_ERR DRIVER_NAME ": "
> > > -                     "Can't map registers\n");
> > > -             rv = -ENOMEM;
> > > -             goto error_release;
> > > -     }
> > > +     bcom_eng->regs = regs;
> > > +     bcom_eng->regs_base = res_bcom->start;
> > >
> > >       /* Now, do the real init */
> > >       rv = bcom_engine_init();
> > >       if (rv)
> > > -             goto error_unmap;
> > > +             goto error_sramclean;
> > >
> > >       /* Done ! */
> > >       printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
> > > @@ -439,10 +422,6 @@ static int mpc52xx_bcom_probe(struct platform_device *op)
> > >       return 0;
> > >
> > >       /* Error path */
> > > -error_unmap:
> > > -     iounmap(bcom_eng->regs);
> > > -error_release:
> > > -     release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
> > >  error_sramclean:
> > >       kfree(bcom_eng);
> > >       bcom_sram_cleanup();
> > > @@ -463,10 +442,6 @@ static void mpc52xx_bcom_remove(struct platform_device *op)
> > >       /* Cleanup SRAM */
> > >       bcom_sram_cleanup();
> > >
> > > -     /* Release regs */
> > > -     iounmap(bcom_eng->regs);
> > > -     release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
> > > -
> > >       /* Release the node */
> > >       of_node_put(bcom_eng->ofnode);
> > >
> > > --
> > > 2.55.0
> > >