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Date: Mon, 1 Aug 2022 10:43:59 +0800 From: Yang Yingliang <yangyingliang@...wei.com> To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> CC: <linux-kernel@...r.kernel.org>, <linux-fbdev@...r.kernel.org>, <deller@....de> Subject: Re: [PATCH -next] video: fbdev: imxfb: fix return value check in imxfb_probe() Hi, On 2022/7/31 7:18, Uwe Kleine-König wrote: > Hello, > > On Fri, Jul 29, 2022 at 10:41:34AM +0800, Yang Yingliang wrote: >> If devm_ioremap_resource() fails, it never return NULL, replace >> NULL test with IS_ERR(). > Oh, thanks for cleanup up behind me. Did you find this using some static > analysis tool? I would consider it interesting and fair to mention this > in the commit log. I found it by coccicheck like this: @@ expression ret, E; @@ ret = \(devm_ioremap_resource\)(...); ... when != ret = E when != IS_ERR(ret) ( ret == NULL || IS_ERR(ret) | IS_ERR(ret) || ret == NULL | ret != NULL && !IS_ERR(ret) | !IS_ERR(ret) && ret != NULL | - ret == NULL + IS_ERR(ret) | - ret != NULL + !IS_ERR(ret) ) Thanks, Yang > > Best regards > Uwe > >
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