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When a device ID is written to /sys/bus/pci/drivers/.../new_id, we previously only checked the driver's static ID table for duplicates. Writing the same ID several times added it to the dynamic IDs list several times. This doesn't cause user-visible broken behavior, but remove_id_store() only removes one of the duplicate IDs, so if we add an ID several times, we would have to remove it the same number of times before it's completely gone. Fix it by calling pci_match_device(), which checks both dynamic and static IDs to avoid inserting duplicate IDs in dynamic IDs list. After fix, attempts to add an ID more than once cause an error: # echo "1af4 1041" > /sys/bus/pci/drivers/vfio-pci/new_id # echo "1af4 1041" > /sys/bus/pci/drivers/vfio-pci/new_id bash: echo: write error: File exists Link: https://lore.kernel.org/r/20201117054409.3428-3-zhenzhong.duan@gmail.com Signed-off-by: Zhenzhong Duan <zhenzhong.duan@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.