1. 01 8月, 2017 1 次提交
    • T
      device property: Fix usecount for of_graph_get_port_parent() · c0a480d1
      Tony Lindgren 提交于
      Fix inconsistent use of of_graph_get_port_parent() where
      asoc_simple_card_parse_graph_dai() does of_node_get() before
      calling it while other callers do not. We can fix this by
      not trashing the node passed to of_graph_get_port_parent().
      
      Let's also make sure the callers have correct refcounts and remove
      related incorrect of_node_put() calls for of_for_each_phandle
      as that's done by of_phandle_iterator_next() except when
      we break out of the loop early.
      
      Let's fix both issues with a single patch to avoid kobject
      refcounts getting messed up more if two patches are merged
      separately.
      
      Otherwise strange issues can happen caused by memory corruption
      caused by too many kobject_del() calls such as:
      
      BUG: sleeping function called from invalid context at
      kernel/locking/mutex.c:747
      ...
      (___might_sleep)
      (__mutex_lock)
      (mutex_lock_nested)
      (kernfs_remove)
      (kobject_del)
      (kobject_put)
      (of_get_next_parent)
      (of_graph_get_port_parent)
      (asoc_simple_card_parse_graph_dai [snd_soc_simple_card_utils])
      (asoc_graph_card_probe [snd_soc_audio_graph_card])
      
      Fixes: 0ef472a9 ("of_graph: add of_graph_get_port_parent()")
      Fixes: 2692c1c6 ("ASoC: add audio-graph-card support")
      Fixes: 1689333f ("ASoC: simple-card-utils: add asoc_simple_card_parse_graph_dai()")
      Signed-off-by: NTony Lindgren <tony@atomide.com>
      Reviewed-by: NRob Herring <robh@kernel.org>
      Tested-by: NAntonio Borneo <borneo.antonio@gmail.com>
      Tested-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
      Signed-off-by: NMark Brown <broonie@kernel.org>
      c0a480d1
  2. 28 7月, 2017 2 次提交
  3. 27 7月, 2017 1 次提交
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  10. 29 6月, 2017 11 次提交