* [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration
@ 2022-01-09 12:29 Christophe JAILLET
2022-02-07 14:31 ` Wolfram Sang
2022-08-20 6:38 ` Wolfram Sang
0 siblings, 2 replies; 4+ messages in thread
From: Christophe JAILLET @ 2022-01-09 12:29 UTC (permalink / raw)
To: Seth Heasley, Neil Horman
Cc: linux-kernel, kernel-janitors, Christophe JAILLET, linux-i2c
As stated in [1], dma_set_mask() with a 64-bit mask never fails if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.
Simplify code and remove some dead code accordingly.
[1]: https://lkml.org/lkml/2021/6/7/398
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
drivers/i2c/busses/i2c-ismt.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
index f4820fd3dc13..951f3511afaa 100644
--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -920,11 +920,8 @@ ismt_probe(struct pci_dev *pdev, const struct pci_device_id *id)
err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (err) {
- err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
- if (err) {
- dev_err(&pdev->dev, "dma_set_mask fail\n");
- return -ENODEV;
- }
+ dev_err(&pdev->dev, "dma_set_mask fail\n");
+ return -ENODEV;
}
err = ismt_dev_init(priv);
--
2.32.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration
2022-01-09 12:29 [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration Christophe JAILLET
@ 2022-02-07 14:31 ` Wolfram Sang
2022-04-05 21:13 ` Seth Heasley
2022-08-20 6:38 ` Wolfram Sang
1 sibling, 1 reply; 4+ messages in thread
From: Wolfram Sang @ 2022-02-07 14:31 UTC (permalink / raw)
To: Christophe JAILLET
Cc: Seth Heasley, Neil Horman, linux-kernel, kernel-janitors, linux-i2c
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On Sun, Jan 09, 2022 at 01:29:45PM +0100, Christophe JAILLET wrote:
> As stated in [1], dma_set_mask() with a 64-bit mask never fails if
> dev->dma_mask is non-NULL.
> So, if it fails, the 32 bits case will also fail for the same reason.
>
>
> Simplify code and remove some dead code accordingly.
>
> [1]: https://lkml.org/lkml/2021/6/7/398
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Seth, Neil, do you agree?
> ---
> drivers/i2c/busses/i2c-ismt.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
> index f4820fd3dc13..951f3511afaa 100644
> --- a/drivers/i2c/busses/i2c-ismt.c
> +++ b/drivers/i2c/busses/i2c-ismt.c
> @@ -920,11 +920,8 @@ ismt_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>
> err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> if (err) {
> - err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> - if (err) {
> - dev_err(&pdev->dev, "dma_set_mask fail\n");
> - return -ENODEV;
> - }
> + dev_err(&pdev->dev, "dma_set_mask fail\n");
> + return -ENODEV;
> }
>
> err = ismt_dev_init(priv);
> --
> 2.32.0
>
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration
2022-02-07 14:31 ` Wolfram Sang
@ 2022-04-05 21:13 ` Seth Heasley
0 siblings, 0 replies; 4+ messages in thread
From: Seth Heasley @ 2022-04-05 21:13 UTC (permalink / raw)
To: Wolfram Sang, Christophe JAILLET
Cc: Neil Horman, linux-kernel, kernel-janitors, linux-i2c, seth.heasley
On Mon, 2022-02-07 at 15:31 +0100, Wolfram Sang wrote:
> On Sun, Jan 09, 2022 at 01:29:45PM +0100, Christophe JAILLET wrote:
> > As stated in [1], dma_set_mask() with a 64-bit mask never fails if
> > dev->dma_mask is non-NULL.
> > So, if it fails, the 32 bits case will also fail for the same
> > reason.
> >
> >
> > Simplify code and remove some dead code accordingly.
> >
> > [1]: https://lkml.org/lkml/2021/6/7/398
> >
> > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Seth Heasley <seth.heasley@intel.com>
>
> Seth, Neil, do you agree?
Yes, I agree this change makes sense.
>
> > ---
> > drivers/i2c/busses/i2c-ismt.c | 7 ++-----
> > 1 file changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-ismt.c
> > b/drivers/i2c/busses/i2c-ismt.c
> > index f4820fd3dc13..951f3511afaa 100644
> > --- a/drivers/i2c/busses/i2c-ismt.c
> > +++ b/drivers/i2c/busses/i2c-ismt.c
> > @@ -920,11 +920,8 @@ ismt_probe(struct pci_dev *pdev, const struct
> > pci_device_id *id)
> >
> > err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> > if (err) {
> > - err = dma_set_mask_and_coherent(&pdev->dev,
> > DMA_BIT_MASK(32));
> > - if (err) {
> > - dev_err(&pdev->dev, "dma_set_mask fail\n");
> > - return -ENODEV;
> > - }
> > + dev_err(&pdev->dev, "dma_set_mask fail\n");
> > + return -ENODEV;
> > }
> >
> > err = ismt_dev_init(priv);
> > --
> > 2.32.0
> >
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration
2022-01-09 12:29 [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration Christophe JAILLET
2022-02-07 14:31 ` Wolfram Sang
@ 2022-08-20 6:38 ` Wolfram Sang
1 sibling, 0 replies; 4+ messages in thread
From: Wolfram Sang @ 2022-08-20 6:38 UTC (permalink / raw)
To: Christophe JAILLET
Cc: Seth Heasley, Neil Horman, linux-kernel, kernel-janitors, linux-i2c
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On Sun, Jan 09, 2022 at 01:29:45PM +0100, Christophe JAILLET wrote:
> As stated in [1], dma_set_mask() with a 64-bit mask never fails if
> dev->dma_mask is non-NULL.
> So, if it fails, the 32 bits case will also fail for the same reason.
>
>
> Simplify code and remove some dead code accordingly.
>
> [1]: https://lkml.org/lkml/2021/6/7/398
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Sorry, this fell a bit through the cracks.
Applied to for-next now, thanks!
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-01-09 12:29 [PATCH] i2c: ismt: Remove useless DMA-32 fallback configuration Christophe JAILLET
2022-02-07 14:31 ` Wolfram Sang
2022-04-05 21:13 ` Seth Heasley
2022-08-20 6:38 ` Wolfram Sang
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