diff mbox series

[v2,2/2] PCI: dwc: Cleanup in dw_pcie_ep_raise_msi_irq()

Message ID e231e268-d537-4613-a87c-876d99ea49e4@moroto.mountain
State New
Headers
Series [v2,1/2] PCI: dwc: Fix a 64bit bug in dw_pcie_ep_raise_msix_irq() |

Commit Message

Dan Carpenter Jan. 19, 2024, 8:24 a.m. UTC 
  The alignment code in dw_pcie_ep_raise_msix_irq() and
dw_pcie_ep_raise_msi_irq() is quite similar.  I recently update the code
in the former, so tweak the latter to match as well for consistency sake.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
v2: Add this new patch

I wrote two versions of this, one where both patches were folded
together and this one where the style tweaks are separated out into
their own patch.  This is the better version.

 drivers/pci/controller/dwc/pcie-designware-ep.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Niklas Cassel Jan. 19, 2024, 12:46 p.m. UTC | #1 
On Fri, Jan 19, 2024 at 11:24:18AM +0300, Dan Carpenter wrote:
> The alignment code in dw_pcie_ep_raise_msix_irq() and
> dw_pcie_ep_raise_msi_irq() is quite similar.  I recently update the code
> in the former, so tweak the latter to match as well for consistency sake.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
> v2: Add this new patch
> 
> I wrote two versions of this, one where both patches were folded
> together and this one where the style tweaks are separated out into
> their own patch.  This is the better version.
> 
>  drivers/pci/controller/dwc/pcie-designware-ep.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 2b6607c23541..ccfc21cd0bb0 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -456,8 +456,8 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
>  	u32 msg_addr_lower, msg_addr_upper, reg;
>  	struct dw_pcie_ep_func *ep_func;
>  	struct pci_epc *epc = ep->epc;
> -	unsigned int aligned_offset;
>  	u16 msg_ctrl, msg_data;
> +	u64 aligned_offset;
>  	bool has_upper;
>  	u64 msg_addr;
>  	int ret;
> @@ -483,8 +483,8 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
>  		msg_data = dw_pcie_ep_readw_dbi(ep, func_no, reg);
>  	}
>  	aligned_offset = msg_addr_lower & (epc->mem->window.page_size - 1);
> -	msg_addr = ((u64)msg_addr_upper) << 32 |
> -			(msg_addr_lower & ~aligned_offset);
> +	msg_addr = ((u64)msg_addr_upper) << 32 | msg_addr_lower;
> +	msg_addr &= ~aligned_offset;
>  	ret = dw_pcie_ep_map_addr(epc, func_no, 0, ep->msi_mem_phys, msg_addr,
>  				  epc->mem->window.page_size);
>  	if (ret)
> -- 
> 2.43.0
> 

I like this change, but like Ilpo said, perhaps even cleaner with:
msg_addr = ((u64)msg_addr_upper) << 32 | msg_addr_lower;
msg_addr = ALIGN_DOWN(msg_addr, epc->mem->window.page_size);

As we can remove the aligned_offset variable completely,
no need to even change the type.

(dw_pcie_ep_raise_msix_irq() would obviously only need the
second statement.)


Kind regards,
Niklas
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 2b6607c23541..ccfc21cd0bb0 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -456,8 +456,8 @@  int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 	u32 msg_addr_lower, msg_addr_upper, reg;
 	struct dw_pcie_ep_func *ep_func;
 	struct pci_epc *epc = ep->epc;
-	unsigned int aligned_offset;
 	u16 msg_ctrl, msg_data;
+	u64 aligned_offset;
 	bool has_upper;
 	u64 msg_addr;
 	int ret;
@@ -483,8 +483,8 @@  int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 		msg_data = dw_pcie_ep_readw_dbi(ep, func_no, reg);
 	}
 	aligned_offset = msg_addr_lower & (epc->mem->window.page_size - 1);
-	msg_addr = ((u64)msg_addr_upper) << 32 |
-			(msg_addr_lower & ~aligned_offset);
+	msg_addr = ((u64)msg_addr_upper) << 32 | msg_addr_lower;
+	msg_addr &= ~aligned_offset;
 	ret = dw_pcie_ep_map_addr(epc, func_no, 0, ep->msi_mem_phys, msg_addr,
 				  epc->mem->window.page_size);
 	if (ret)