linux-kernel - Re: [PATCH AUTOSEL 6.1 23/28] PCI: dwc: Clean up dw_pcie_ep_raise_msi

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Date: Sun, 18 Feb 2024 19:01:05 +0100
From: Pavel Machek <pavel@....cz>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Niklas Cassel <cassel@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
	lpieralisi@...nel.org, kw@...ux.com, linux-pci@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.1 23/28] PCI: dwc: Clean up
 dw_pcie_ep_raise_msi_irq() alignment

Hi!

> From: Dan Carpenter <dan.carpenter@...aro.org>
> 
> [ Upstream commit 67057f48df79a3d73683385f521215146861684b ]
> 
> I recently changed the alignment code in dw_pcie_ep_raise_msix_irq().  The
> code in dw_pcie_ep_raise_msi_irq() is similar, so update it to match, just
> for consistency.  (No effect on runtime, just a cleanup).

Just a cleanup, we don't need it in stable.

Best regards,
									Pavel
									
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -528,9 +528,10 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
>  		reg = ep_func->msi_cap + func_offset + PCI_MSI_DATA_32;
>  		msg_data = dw_pcie_readw_dbi(pci, 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;
> +
> +	aligned_offset = msg_addr & (epc->mem->window.page_size - 1);
> +	msg_addr = ALIGN_DOWN(msg_addr, epc->mem->window.page_size);
>  	ret = dw_pcie_ep_map_addr(epc, func_no, 0, ep->msi_mem_phys, msg_addr,
>  				  epc->mem->window.page_size);
>  	if (ret)

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