* [PATCH] mtd: nand: tango: Enforce DMA direction type
@ 2017-02-13 9:45 ` Boris Brezillon
0 siblings, 0 replies; 12+ messages in thread
From: Boris Brezillon @ 2017-02-13 9:45 UTC (permalink / raw)
To: linux-arm-kernel
do_dma() use an integer to pass the DMA data direction information and
pass the same value to dmaengine_prep_slave_sg().
Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
definitions so it works fine, but assuming this will always be the case
is not safe.
Enforce enum dma_data_direction type in the function prototype and make
the enum dma_data_direction -> enum dma_transfer_direction conversion
explicit.
Reported-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/mtd/nand/tango_nand.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
index 4a5e948c62df..9a0e2f85d865 100644
--- a/drivers/mtd/nand/tango_nand.c
+++ b/drivers/mtd/nand/tango_nand.c
@@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
complete(arg);
}
-static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
- int len, int page)
+static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
+ const void *buf, int len, int page)
{
void __iomem *addr = nfc->reg_base + NFC_STATUS;
struct dma_chan *chan = nfc->chan;
@@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
return -EIO;
- desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
+ desc = dmaengine_prep_slave_sg(chan, &sg, 1,
+ dir == DMA_FROM_DEVICE ?
+ DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT);
if (!desc)
goto dma_unmap;
--
2.7.4
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH] mtd: nand: tango: Enforce DMA direction type
2017-02-13 9:45 ` Boris Brezillon
@ 2017-02-13 10:54 ` Richard Weinberger
-1 siblings, 0 replies; 12+ messages in thread
From: Richard Weinberger @ 2017-02-13 10:54 UTC (permalink / raw)
To: Boris Brezillon, Marc Gonzalez
Cc: linux-mtd, David Woodhouse, Brian Norris, Marek Vasut,
Cyrille Pitchen, linux-arm-kernel
Am 13.02.2017 um 10:45 schrieb Boris Brezillon:
> do_dma() use an integer to pass the DMA data direction information and
> pass the same value to dmaengine_prep_slave_sg().
>
> Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> definitions so it works fine, but assuming this will always be the case
> is not safe.
>
> Enforce enum dma_data_direction type in the function prototype and make
> the enum dma_data_direction -> enum dma_transfer_direction conversion
> explicit.
>
> Reported-by: Richard Weinberger <richard@nod.at>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> drivers/mtd/nand/tango_nand.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..9a0e2f85d865 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
> complete(arg);
> }
>
> -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> - int len, int page)
> +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> + const void *buf, int len, int page)
> {
> void __iomem *addr = nfc->reg_base + NFC_STATUS;
> struct dma_chan *chan = nfc->chan;
> @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1,
> + dir == DMA_FROM_DEVICE ?
> + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
> + DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
Reviewed-by: Richard Weinberger <richard@nod.at>
Thanks,
//richard
^ permalink raw reply [flat|nested] 12+ messages in thread* [PATCH] mtd: nand: tango: Enforce DMA direction type
@ 2017-02-13 10:54 ` Richard Weinberger
0 siblings, 0 replies; 12+ messages in thread
From: Richard Weinberger @ 2017-02-13 10:54 UTC (permalink / raw)
To: linux-arm-kernel
Am 13.02.2017 um 10:45 schrieb Boris Brezillon:
> do_dma() use an integer to pass the DMA data direction information and
> pass the same value to dmaengine_prep_slave_sg().
>
> Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> definitions so it works fine, but assuming this will always be the case
> is not safe.
>
> Enforce enum dma_data_direction type in the function prototype and make
> the enum dma_data_direction -> enum dma_transfer_direction conversion
> explicit.
>
> Reported-by: Richard Weinberger <richard@nod.at>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> drivers/mtd/nand/tango_nand.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..9a0e2f85d865 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
> complete(arg);
> }
>
> -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> - int len, int page)
> +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> + const void *buf, int len, int page)
> {
> void __iomem *addr = nfc->reg_base + NFC_STATUS;
> struct dma_chan *chan = nfc->chan;
> @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1,
> + dir == DMA_FROM_DEVICE ?
> + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
> + DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
Reviewed-by: Richard Weinberger <richard@nod.at>
Thanks,
//richard
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH] mtd: nand: tango: Enforce DMA direction type
2017-02-13 9:45 ` Boris Brezillon
@ 2017-02-20 12:30 ` Marc Gonzalez
-1 siblings, 0 replies; 12+ messages in thread
From: Marc Gonzalez @ 2017-02-20 12:30 UTC (permalink / raw)
To: Boris Brezillon
Cc: Richard Weinberger, linux-mtd, David Woodhouse, Brian Norris,
Marek Vasut, Cyrille Pitchen, linux-arm-kernel
On 13/02/2017 10:45, Boris Brezillon wrote:
> do_dma() use an integer to pass the DMA data direction information and
> pass the same value to dmaengine_prep_slave_sg().
>
> Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> definitions so it works fine, but assuming this will always be the case
> is not safe.
>
> Enforce enum dma_data_direction type in the function prototype and make
> the enum dma_data_direction -> enum dma_transfer_direction conversion
> explicit.
>
> Reported-by: Richard Weinberger <richard@nod.at>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> drivers/mtd/nand/tango_nand.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..9a0e2f85d865 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
> complete(arg);
> }
>
> -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> - int len, int page)
> +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> + const void *buf, int len, int page)
> {
> void __iomem *addr = nfc->reg_base + NFC_STATUS;
> struct dma_chan *chan = nfc->chan;
> @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1,
> + dir == DMA_FROM_DEVICE ?
> + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
> + DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
>
How about evaluating the ternary conditional into a temp var?
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
index 4a5e948c62df..c3f145528f1d 100644
--- a/drivers/mtd/nand/tango_nand.c
+++ b/drivers/mtd/nand/tango_nand.c
@@ -231,6 +231,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
struct dma_async_tx_descriptor *desc;
struct scatterlist sg;
struct completion tx_done;
+ int xdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
int err = -EIO;
u32 res, val;
@@ -238,7 +239,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
return -EIO;
- desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
+ desc = dmaengine_prep_slave_sg(chan, &sg, 1, xdir, DMA_PREP_INTERRUPT);
if (!desc)
goto dma_unmap;
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH] mtd: nand: tango: Enforce DMA direction type
@ 2017-02-20 12:30 ` Marc Gonzalez
0 siblings, 0 replies; 12+ messages in thread
From: Marc Gonzalez @ 2017-02-20 12:30 UTC (permalink / raw)
To: linux-arm-kernel
On 13/02/2017 10:45, Boris Brezillon wrote:
> do_dma() use an integer to pass the DMA data direction information and
> pass the same value to dmaengine_prep_slave_sg().
>
> Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> definitions so it works fine, but assuming this will always be the case
> is not safe.
>
> Enforce enum dma_data_direction type in the function prototype and make
> the enum dma_data_direction -> enum dma_transfer_direction conversion
> explicit.
>
> Reported-by: Richard Weinberger <richard@nod.at>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> drivers/mtd/nand/tango_nand.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..9a0e2f85d865 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
> complete(arg);
> }
>
> -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> - int len, int page)
> +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> + const void *buf, int len, int page)
> {
> void __iomem *addr = nfc->reg_base + NFC_STATUS;
> struct dma_chan *chan = nfc->chan;
> @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1,
> + dir == DMA_FROM_DEVICE ?
> + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
> + DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
>
How about evaluating the ternary conditional into a temp var?
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
index 4a5e948c62df..c3f145528f1d 100644
--- a/drivers/mtd/nand/tango_nand.c
+++ b/drivers/mtd/nand/tango_nand.c
@@ -231,6 +231,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
struct dma_async_tx_descriptor *desc;
struct scatterlist sg;
struct completion tx_done;
+ int xdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
int err = -EIO;
u32 res, val;
@@ -238,7 +239,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
return -EIO;
- desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
+ desc = dmaengine_prep_slave_sg(chan, &sg, 1, xdir, DMA_PREP_INTERRUPT);
if (!desc)
goto dma_unmap;
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH] mtd: nand: tango: Enforce DMA direction type
2017-02-20 12:30 ` Marc Gonzalez
@ 2017-02-20 12:35 ` Boris Brezillon
-1 siblings, 0 replies; 12+ messages in thread
From: Boris Brezillon @ 2017-02-20 12:35 UTC (permalink / raw)
To: Marc Gonzalez
Cc: Richard Weinberger, linux-mtd, David Woodhouse, Brian Norris,
Marek Vasut, Cyrille Pitchen, linux-arm-kernel
On Mon, 20 Feb 2017 13:30:25 +0100
Marc Gonzalez <marc_gonzalez@sigmadesigns.com> wrote:
> On 13/02/2017 10:45, Boris Brezillon wrote:
>
> > do_dma() use an integer to pass the DMA data direction information and
> > pass the same value to dmaengine_prep_slave_sg().
> >
> > Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> > definitions so it works fine, but assuming this will always be the case
> > is not safe.
> >
> > Enforce enum dma_data_direction type in the function prototype and make
> > the enum dma_data_direction -> enum dma_transfer_direction conversion
> > explicit.
> >
> > Reported-by: Richard Weinberger <richard@nod.at>
> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > ---
> > drivers/mtd/nand/tango_nand.c | 9 ++++++---
> > 1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> > index 4a5e948c62df..9a0e2f85d865 100644
> > --- a/drivers/mtd/nand/tango_nand.c
> > +++ b/drivers/mtd/nand/tango_nand.c
> > @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
> > complete(arg);
> > }
> >
> > -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> > - int len, int page)
> > +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> > + const void *buf, int len, int page)
> > {
> > void __iomem *addr = nfc->reg_base + NFC_STATUS;
> > struct dma_chan *chan = nfc->chan;
> > @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> > if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> > return -EIO;
> >
> > - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> > + desc = dmaengine_prep_slave_sg(chan, &sg, 1,
> > + dir == DMA_FROM_DEVICE ?
> > + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
> > + DMA_PREP_INTERRUPT);
> > if (!desc)
> > goto dma_unmap;
> >
> >
>
> How about evaluating the ternary conditional into a temp var?
Works for me.
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..c3f145528f1d 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -231,6 +231,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> struct dma_async_tx_descriptor *desc;
> struct scatterlist sg;
> struct completion tx_done;
> + int xdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
> int err = -EIO;
> u32 res, val;
>
> @@ -238,7 +239,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1, xdir, DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
^ permalink raw reply [flat|nested] 12+ messages in thread* [PATCH] mtd: nand: tango: Enforce DMA direction type
@ 2017-02-20 12:35 ` Boris Brezillon
0 siblings, 0 replies; 12+ messages in thread
From: Boris Brezillon @ 2017-02-20 12:35 UTC (permalink / raw)
To: linux-arm-kernel
On Mon, 20 Feb 2017 13:30:25 +0100
Marc Gonzalez <marc_gonzalez@sigmadesigns.com> wrote:
> On 13/02/2017 10:45, Boris Brezillon wrote:
>
> > do_dma() use an integer to pass the DMA data direction information and
> > pass the same value to dmaengine_prep_slave_sg().
> >
> > Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> > definitions so it works fine, but assuming this will always be the case
> > is not safe.
> >
> > Enforce enum dma_data_direction type in the function prototype and make
> > the enum dma_data_direction -> enum dma_transfer_direction conversion
> > explicit.
> >
> > Reported-by: Richard Weinberger <richard@nod.at>
> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > ---
> > drivers/mtd/nand/tango_nand.c | 9 ++++++---
> > 1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> > index 4a5e948c62df..9a0e2f85d865 100644
> > --- a/drivers/mtd/nand/tango_nand.c
> > +++ b/drivers/mtd/nand/tango_nand.c
> > @@ -223,8 +223,8 @@ static void tango_dma_callback(void *arg)
> > complete(arg);
> > }
> >
> > -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> > - int len, int page)
> > +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> > + const void *buf, int len, int page)
> > {
> > void __iomem *addr = nfc->reg_base + NFC_STATUS;
> > struct dma_chan *chan = nfc->chan;
> > @@ -238,7 +238,10 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> > if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> > return -EIO;
> >
> > - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> > + desc = dmaengine_prep_slave_sg(chan, &sg, 1,
> > + dir == DMA_FROM_DEVICE ?
> > + DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
> > + DMA_PREP_INTERRUPT);
> > if (!desc)
> > goto dma_unmap;
> >
> >
>
> How about evaluating the ternary conditional into a temp var?
Works for me.
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..c3f145528f1d 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -231,6 +231,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> struct dma_async_tx_descriptor *desc;
> struct scatterlist sg;
> struct completion tx_done;
> + int xdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
> int err = -EIO;
> u32 res, val;
>
> @@ -238,7 +239,7 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1, xdir, DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
^ permalink raw reply [flat|nested] 12+ messages in thread* [PATCH v2] mtd: nand: tango: Enforce DMA direction type
2017-02-20 12:35 ` Boris Brezillon
@ 2017-02-20 13:10 ` Marc Gonzalez
-1 siblings, 0 replies; 12+ messages in thread
From: Marc Gonzalez @ 2017-02-20 13:10 UTC (permalink / raw)
To: Boris Brezillon
Cc: Richard Weinberger, linux-mtd, David Woodhouse, Brian Norris,
Marek Vasut, Cyrille Pitchen, linux-arm-kernel
From: Boris Brezillon <boris.brezillon@free-electrons.com>
do_dma() uses an int to pass the DMA data direction information and
pass the same value to dmaengine_prep_slave_sg().
Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
definitions so it works fine, but assuming this will always be the case
is not safe.
Enforce enum dma_data_direction type in the function prototype and make
the enum dma_data_direction -> enum dma_transfer_direction conversion
explicit.
Reported-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
---
drivers/mtd/nand/tango_nand.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
index 4a5e948c62df..05b6e1065203 100644
--- a/drivers/mtd/nand/tango_nand.c
+++ b/drivers/mtd/nand/tango_nand.c
@@ -223,12 +223,13 @@ static void tango_dma_callback(void *arg)
complete(arg);
}
-static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
- int len, int page)
+static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
+ const void *buf, int len, int page)
{
void __iomem *addr = nfc->reg_base + NFC_STATUS;
struct dma_chan *chan = nfc->chan;
struct dma_async_tx_descriptor *desc;
+ enum dma_transfer_direction tdir;
struct scatterlist sg;
struct completion tx_done;
int err = -EIO;
@@ -238,7 +239,8 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
return -EIO;
- desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
+ tdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+ desc = dmaengine_prep_slave_sg(chan, &sg, 1, tdir, DMA_PREP_INTERRUPT);
if (!desc)
goto dma_unmap;
--
3.14159265358979
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v2] mtd: nand: tango: Enforce DMA direction type
@ 2017-02-20 13:10 ` Marc Gonzalez
0 siblings, 0 replies; 12+ messages in thread
From: Marc Gonzalez @ 2017-02-20 13:10 UTC (permalink / raw)
To: linux-arm-kernel
From: Boris Brezillon <boris.brezillon@free-electrons.com>
do_dma() uses an int to pass the DMA data direction information and
pass the same value to dmaengine_prep_slave_sg().
Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
definitions so it works fine, but assuming this will always be the case
is not safe.
Enforce enum dma_data_direction type in the function prototype and make
the enum dma_data_direction -> enum dma_transfer_direction conversion
explicit.
Reported-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
---
drivers/mtd/nand/tango_nand.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
index 4a5e948c62df..05b6e1065203 100644
--- a/drivers/mtd/nand/tango_nand.c
+++ b/drivers/mtd/nand/tango_nand.c
@@ -223,12 +223,13 @@ static void tango_dma_callback(void *arg)
complete(arg);
}
-static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
- int len, int page)
+static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
+ const void *buf, int len, int page)
{
void __iomem *addr = nfc->reg_base + NFC_STATUS;
struct dma_chan *chan = nfc->chan;
struct dma_async_tx_descriptor *desc;
+ enum dma_transfer_direction tdir;
struct scatterlist sg;
struct completion tx_done;
int err = -EIO;
@@ -238,7 +239,8 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
return -EIO;
- desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
+ tdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+ desc = dmaengine_prep_slave_sg(chan, &sg, 1, tdir, DMA_PREP_INTERRUPT);
if (!desc)
goto dma_unmap;
--
3.14159265358979
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH v2] mtd: nand: tango: Enforce DMA direction type
2017-02-20 13:10 ` Marc Gonzalez
@ 2017-03-16 9:27 ` Boris Brezillon
-1 siblings, 0 replies; 12+ messages in thread
From: Boris Brezillon @ 2017-03-16 9:27 UTC (permalink / raw)
To: Marc Gonzalez
Cc: Richard Weinberger, linux-mtd, David Woodhouse, Brian Norris,
Marek Vasut, Cyrille Pitchen, linux-arm-kernel
On Mon, 20 Feb 2017 14:10:07 +0100
Marc Gonzalez <marc_gonzalez@sigmadesigns.com> wrote:
> From: Boris Brezillon <boris.brezillon@free-electrons.com>
>
> do_dma() uses an int to pass the DMA data direction information and
> pass the same value to dmaengine_prep_slave_sg().
>
> Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> definitions so it works fine, but assuming this will always be the case
> is not safe.
>
> Enforce enum dma_data_direction type in the function prototype and make
> the enum dma_data_direction -> enum dma_transfer_direction conversion
> explicit.
>
> Reported-by: Richard Weinberger <richard@nod.at>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Acked-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Applied.
> ---
> drivers/mtd/nand/tango_nand.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..05b6e1065203 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -223,12 +223,13 @@ static void tango_dma_callback(void *arg)
> complete(arg);
> }
>
> -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> - int len, int page)
> +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> + const void *buf, int len, int page)
> {
> void __iomem *addr = nfc->reg_base + NFC_STATUS;
> struct dma_chan *chan = nfc->chan;
> struct dma_async_tx_descriptor *desc;
> + enum dma_transfer_direction tdir;
> struct scatterlist sg;
> struct completion tx_done;
> int err = -EIO;
> @@ -238,7 +239,8 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + tdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1, tdir, DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
^ permalink raw reply [flat|nested] 12+ messages in thread* [PATCH v2] mtd: nand: tango: Enforce DMA direction type
@ 2017-03-16 9:27 ` Boris Brezillon
0 siblings, 0 replies; 12+ messages in thread
From: Boris Brezillon @ 2017-03-16 9:27 UTC (permalink / raw)
To: linux-arm-kernel
On Mon, 20 Feb 2017 14:10:07 +0100
Marc Gonzalez <marc_gonzalez@sigmadesigns.com> wrote:
> From: Boris Brezillon <boris.brezillon@free-electrons.com>
>
> do_dma() uses an int to pass the DMA data direction information and
> pass the same value to dmaengine_prep_slave_sg().
>
> Currently, DMA_{FROM,TO}_DEVICE match DMA_{DEV_TO_MEM,MEM_TO_DEV}
> definitions so it works fine, but assuming this will always be the case
> is not safe.
>
> Enforce enum dma_data_direction type in the function prototype and make
> the enum dma_data_direction -> enum dma_transfer_direction conversion
> explicit.
>
> Reported-by: Richard Weinberger <richard@nod.at>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Acked-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Applied.
> ---
> drivers/mtd/nand/tango_nand.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
> index 4a5e948c62df..05b6e1065203 100644
> --- a/drivers/mtd/nand/tango_nand.c
> +++ b/drivers/mtd/nand/tango_nand.c
> @@ -223,12 +223,13 @@ static void tango_dma_callback(void *arg)
> complete(arg);
> }
>
> -static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> - int len, int page)
> +static int do_dma(struct tango_nfc *nfc, enum dma_data_direction dir, int cmd,
> + const void *buf, int len, int page)
> {
> void __iomem *addr = nfc->reg_base + NFC_STATUS;
> struct dma_chan *chan = nfc->chan;
> struct dma_async_tx_descriptor *desc;
> + enum dma_transfer_direction tdir;
> struct scatterlist sg;
> struct completion tx_done;
> int err = -EIO;
> @@ -238,7 +239,8 @@ static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
> if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
> return -EIO;
>
> - desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
> + tdir = dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
> + desc = dmaengine_prep_slave_sg(chan, &sg, 1, tdir, DMA_PREP_INTERRUPT);
> if (!desc)
> goto dma_unmap;
>
^ permalink raw reply [flat|nested] 12+ messages in thread