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    fbcon: only unbind from console if successfully registered · 2ddce3fd
    Ian Armstrong 提交于
    Attempting to unload a framebuffer module calls unregister_framebuffer()
    which in turn gets fbcon to release it.  If fbcon has no framebuffers
    linked to a console, it will also unbind itself from the console driver.
    However, if fbcon never registered itself as a console driver, the unbind
    will fail causing the framebuffer device entry to persist.  In most cases
    this failure will result in an oops when attempting to access the now
    non-existent device.
    
    This patch ensures that the fbcon unbind request will succeed even if a
    bind was never done.  It tracks if a successful bind ever occurred & will
    only attempt to unbind if needed.  If there never was a bind, it simply
    returns with no error.
    Signed-off-by: NIan Armstrong <ian@iarmst.demon.co.uk>
    Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
    Cc: <stable@kernel.org>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    2ddce3fd
fbcon.c 85.8 KB