Hi Zeng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on staging/staging-testing] [also build test WARNING on v5.1-rc2 next-20190329] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Zeng-Tao/staging-android-ion-refact...

coccinelle warnings: (new ones prefixed by >>)

...

drivers/staging/android/ion/ion.c:427:9-16: WARNING: ERR_CAST can be used with buffer

Please review and possibly fold the followup patch.

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