• Ricardo Ribalda Delgado's avatar
    PCI: Generate uppercase hex for modalias var in uevent · 145b3fe5
    Ricardo Ribalda Delgado authored
    Some implementations of modprobe fail to load the driver for a PCI device
    automatically because the "interface" part of the modalias from the kernel
    is lowercase, and the modalias from file2alias is uppercase.
    
    The "interface" is the low-order byte of the Class Code, defined in PCI
    r3.0, Appendix D.  Most interface types defined in the spec do not use
    alpha characters, so they won't be affected.  For example, 00h, 01h, 10h,
    20h, etc. are unaffected.
    
    Print the "interface" byte of the Class Code in uppercase hex, as we
    already do for the Vendor ID, Device ID, Class, etc.
    
    Commit 89ec3dcf ("PCI: Generate uppercase hex for modalias interface
    class") fixed only half of the problem.  Some udev implementations rely on
    the uevent file and not the modalias file.
    
    Fixes: d1ded203 ("PCI: add MODALIAS to hotplug event for pci devices")
    Fixes: 89ec3dcf ("PCI: Generate uppercase hex for modalias interface class")
    Signed-off-by: default avatarRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>
    Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
    Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    CC: stable@vger.kernel.org
    145b3fe5
pci-driver.c 34.6 KB