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The right variable to check here is port, not dp. This issue was detected using Coccinelle and the following semantic patch: @@ expression x; identifier fld; @@ * x = devm_kzalloc(...); ... when != x == NULL x->fld Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Acked-by: Mark Yao <mark.yao@rock-chips.com> Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: http://patchwork.freedesktop.org/patch/msgid/20170706215833.GA25411@embeddedgus