Wen Yang da9cfb87a4 coccinelle: semantic code search for missing put_device() ... The of_find_device_by_node() takes a reference to the underlying device structure, we should release that reference. The implementation of this semantic code search is: In a function, for a local variable returned by calling of_find_device_by_node(), a, if it is released by a function such as put_device()/of_dev_put()/platform_device_put() after the last use, it is considered that there is no reference leak; b, if it is passed back to the caller via dev_get_drvdata()/platform_get_drvdata()/get_device(), etc., the reference will be released in other functions, and the current function also considers that there is no reference leak; c, for the rest of the situation, the current function should release the reference by calling put_device, this code search will report the corresponding error message. By using this semantic code search, we have found some object reference leaks, such as: commit 11907e9d35 ("ASoC: fsl-asoc-card: fix object reference leaks in fsl_asoc_card_probe") commit a12085d139 ("mtd: rawnand: atmel: fix possible object reference leak") commit 11493f2685 ("mtd: rawnand: jz4780: fix possible object reference leak") There are still dozens of reference leaks in the current kernel code. Further, for the case of b, the object returned to other functions may also have a reference leak, we will continue to develop other cocci scripts to further check the reference leak. Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Reviewed-by: Julia Lawall <Julia.Lawall@lip6.fr> Reviewed-by: Markus Elfring <Markus.Elfring@web.de> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>		2019-03-17 12:55:45 +09:00
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api	dma-mapping: remove dma_zalloc_coherent()	2019-01-08 07:58:49 -05:00
free	coccinelle: semantic code search for missing put_device()	2019-03-17 12:55:45 +09:00
iterators	scripts: coccinelle: check for redeclaration	2019-01-06 09:46:51 +09:00
locks	coccinelle: mini_lock: improve performance	2018-05-22 23:00:23 +09:00
misc	scripts: coccinelle: boolinit: drop warnings on named constants	2019-01-06 09:46:51 +09:00
null	coccinelle: deref_null: improve performance	2018-05-22 23:00:23 +09:00
tests	Coccinelle: doubletest: reduce side effect false positives	2018-08-14 08:58:49 +09:00