xfree86: fbdevhw: fix pci detection on recent Linux
Proxy'ing for <Tj tj.iam.tj@proton.me>
Linux kernel v6.9 has changed the symlink to point to the parent device. This breaks fbdev_open() detection logic. Change it to use the subsystem symlink instead which will remain stable.
Kernel v6.8:
[ 14.067] (II) fbdev_open() sysfs_path=/sys/class/graphics/fb0 [ 14.067] (II) fbdev_open() buf=../../devices/platform/vesa-framebuffer.0/graphics/fb0
Kernel v6.9:
[ 15.609] (II) fbdev_open() sysfs_path=/sys/class/graphics/fb0 [ 15.609] (II) fbdev_open() buf=../../devices/pci0000:00/0000:00:01.0/vesa-framebuffer.0/graphics/fb0
Originally found in automated Debian ISO QA testing [0] and confirmed in Linux [1].
Tested on kernels v6.9.7 and v6.8.12
[0] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1075713 [1] https://lore.kernel.org/lkml/lLyvPFC_APGHNfyGNHRpQy5izBikkaTPOpHooZIT3fFAoJPquSI31ZMueA99XTdr8ysir3X7O7IMdc6za-0m79vr_claeparHhoRouVgHOI=@proton.me/
Fixes: #1714 Signed-off-by: Tj tj.iam.tj@proton.me Reviewed-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Enrico Weigelt, metux IT consult info@metux.net