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commitc876be906cupstream. register_chrdev will only register the first 256 minors of a major chrdev. That means that dynamically allocated misc devices with minor above 255 will fail to open with -ENXIO. This was found by kernel test robot when testing a different change that makes all dynamically allocated minors be above 255. This has, however, been separately tested by creating 256 serio_raw devices with the help of userio driver. Ever since allowing misc devices with minors above 128, this has been possible. Fix it by registering all minor numbers from 0 to MINORMASK + 1 for MISC_MAJOR. Reported-by: kernel test robot <oliver.sang@intel.com> Cc: stable <stable@kernel.org> Closes: https://lore.kernel.org/oe-lkp/202503171507.6c8093d0-lkp@intel.com Fixes:ab760791c0("char: misc: Increase the maximum number of dynamic misc devices to 1048448") Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com> Tested-by: Hou Wenlong <houwenlong.hwl@antgroup.com> Link: https://lore.kernel.org/r/20250317-misc-chrdev-v1-1-6cd05da11aef@igalia.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>