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Platform_get_drvdata is an accessor function, and has no purpose if its result is not used. The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier x; type T; @@ - T x = platform_get_drvdata(...); ... when != x // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>