1. 22 Aug, 2016 4 commits
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  6. 27 Jul, 2016 1 commit
    • Dmitry Torokhov's avatar
      Input: i8042 - break load dependency between atkbd/psmouse and i8042 · 40974618
      Dmitry Torokhov authored
      As explained in 1407814240-4275-1-git-send-email-decui@microsoft.com we
      have a hard load dependency between i8042 and atkbd which prevents
      keyboard from working on Gen2 Hyper-V VMs.
      
      > hyperv_keyboard invokes serio_interrupt(), which needs a valid serio
      > driver like atkbd.c.  atkbd.c depends on libps2.c because it invokes
      > ps2_command().  libps2.c depends on i8042.c because it invokes
      > i8042_check_port_owner().  As a result, hyperv_keyboard actually
      > depends on i8042.c.
      >
      > For a Generation 2 Hyper-V VM (meaning no i8042 device emulated), if a
      > Linux VM (like Arch Linux) happens to configure CONFIG_SERIO_I8042=m
      > rather than =y, atkbd.ko can't load because i8042.ko can't load(due to
      > no i8042 device emulated) and finally hyperv_keyboard can't work and
      > the user can't input: https://bugs.archlinux.org/task/39820
      > (Ubuntu/RHEL/SUSE aren't affected since they use CONFIG_SERIO_I8042=y)
      
      To break the dependency we move away from using i8042_check_port_owner()
      and instead allow serio port owner specify a mutex that clients should use
      to serialize PS/2 command stream.
      Reported-by: default avatarMark Laws <mdl@60hz.org>
      Tested-by: default avatarMark Laws <mdl@60hz.org>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
      40974618
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