linux-kernel - Re: [PATCH] PCI/MSI: Remove duplicated to_pci

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Message-ID: <90e3f84d-860e-74dc-139e-6dc39775e888@linux.intel.com>
Date: Wed, 18 Jun 2025 12:31:08 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Chris Li <chrisl@...nel.org>
cc: Thomas Gleixner <tglx@...utronix.de>, Bjorn Helgaas <bhelgaas@...gle.com>, 
    linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI/MSI: Remove duplicated to_pci_dev() conversion

On Tue, 17 Jun 2025, Chris Li wrote:

> In the pci_msi_update_mask() function, "lock = &to_pci_dev()" does the
> "to_pci_dev()" lookup, and there's another one buried inside
> "msi_desc_to_pci_dev()"
> 
> Introduce a local variable to remove that duplication.
> 
> Signed-off-by: Chris Li <chrisl@...nel.org>
> ---
>  drivers/pci/msi/msi.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
> index 6ede55a7c5e652c80b51b10e58f0290eb6556430..78bed2def9d870d645751436793238ef2bc8b3ed 100644
> --- a/drivers/pci/msi/msi.c
> +++ b/drivers/pci/msi/msi.c
> @@ -113,7 +113,8 @@ static int pci_setup_msi_context(struct pci_dev *dev)
>  
>  void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
>  {
> -	raw_spinlock_t *lock = &to_pci_dev(desc->dev)->msi_lock;
> +	struct pci_dev *dev = msi_desc_to_pci_dev(desc);
> +	raw_spinlock_t *lock = &dev->msi_lock;
>  	unsigned long flags;
>  
>  	if (!desc->pci.msi_attrib.can_mask)
> @@ -122,8 +123,7 @@ void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
>  	raw_spin_lock_irqsave(lock, flags);
>  	desc->pci.msi_mask &= ~clear;
>  	desc->pci.msi_mask |= set;
> -	pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->pci.mask_pos,
> -			       desc->pci.msi_mask);
> +	pci_write_config_dword(dev, desc->pci.mask_pos, desc->pci.msi_mask);
>  	raw_spin_unlock_irqrestore(lock, flags);
>  }

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.