linux-kernel - Re: [PATCH v2] PCI: check also dynamic IDs for duplicate in new_id

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Message-ID: <20201027075217.GA30879@infradead.org>
Date:   Tue, 27 Oct 2020 07:52:17 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Zhenzhong Duan <zhenzhong.duan@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        bhelgaas@...gle.com, hch@...radead.org
Subject: Re: [PATCH v2] PCI: check also dynamic IDs for duplicate in
 new_id_store()

On Mon, Oct 26, 2020 at 11:57:10AM +0800, Zhenzhong Duan wrote:
> When a device ID data is writen to /sys/bus/pci/drivers/.../new_id,
> only static ID table is checked for duplicate and multiple dynamic ID
> entries of same kind are allowed to exist in a dynamic linked list.
> 
> Fix it by calling pci_match_device() which checks both dynamic and static
> IDs.
> 
> After fix, it shows below result which is expected.
> 
> echo "1af4:1000" > /sys/bus/pci/drivers/vfio-pci/new_id
> echo "1af4:1000" > /sys/bus/pci/drivers/vfio-pci/new_id
> -bash: echo: write error: File exists
> 
> Drop the static specifier and add a prototype to avoid build error.
> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...il.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>