2018-07-23 14:31:10

by Jia-Ju Bai

Subject: [PATCH] gpu: drm: amdgpu: Replace mdelay with msleep in cik_pcie_gen3_enable()

cik_pcie_gen3_enable() is only called by cik_common_hw_init(), which is
never called in atomic context.
cik_pcie_gen3_enable() calls mdelay() to busily wait, which is not
necessary.
mdelay() can be replaced with msleep().

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <[email protected]>
---
drivers/gpu/drm/amd/amdgpu/cik.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 0df22030e713..5b7fab2c2008 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -1476,7 +1476,7 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
tmp |= PCIE_LC_CNTL4__LC_REDO_EQ_MASK;
WREG32_PCIE(ixPCIE_LC_CNTL4, tmp);

- mdelay(100);
+ msleep(100);

/* linkctl */
pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &tmp16);
--
2.17.0

2018-07-24 20:51:23

by Alex Deucher

Subject: Re: [PATCH] gpu: drm: amdgpu: Replace mdelay with msleep in cik_pcie_gen3_enable()

On Mon, Jul 23, 2018 at 10:29 AM, Jia-Ju Bai <[email protected]> wrote:
> cik_pcie_gen3_enable() is only called by cik_common_hw_init(), which is
> never called in atomic context.
> cik_pcie_gen3_enable() calls mdelay() to busily wait, which is not
> necessary.
> mdelay() can be replaced with msleep().
>
> This is found by a static analysis tool named DCNS written by myself.
>
> Signed-off-by: Jia-Ju Bai <[email protected]>

Applied. thanks!

Alex

> ---
> drivers/gpu/drm/amd/amdgpu/cik.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
> index 0df22030e713..5b7fab2c2008 100644
> --- a/drivers/gpu/drm/amd/amdgpu/cik.c
> +++ b/drivers/gpu/drm/amd/amdgpu/cik.c
> @@ -1476,7 +1476,7 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
> tmp |= PCIE_LC_CNTL4__LC_REDO_EQ_MASK;
> WREG32_PCIE(ixPCIE_LC_CNTL4, tmp);
>
> - mdelay(100);
> + msleep(100);
>
> /* linkctl */
> pci_read_config_word(root, bridge_pos + PCI_EXP_LNKCTL, &tmp16);
> --
> 2.17.0
>
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