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[104.57.184.186]) by smtp.gmail.com with ESMTPSA id a5sm1017714otb.41.2021.05.27.20.43.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 May 2021 20:43:34 -0700 (PDT) Date: Thu, 27 May 2021 22:43:32 -0500 From: Bjorn Andersson To: Siddharth Gupta Cc: ohad@wizery.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, psodagud@codeaurora.org, stable@vger.kernel.org Subject: Re: [PATCH 1/3] remoteproc: core: Move cdev add before device add Message-ID: References: <1621284349-22752-1-git-send-email-sidgup@codeaurora.org> <1621284349-22752-2-git-send-email-sidgup@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1621284349-22752-2-git-send-email-sidgup@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Mon 17 May 15:45 CDT 2021, Siddharth Gupta wrote: > When cdev_add is called after device_add has been called there is no > way for the userspace to know about the addition of a cdev as cdev_add > itself doesn't trigger a uevent notification, or for the kernel to > know about the change to devt. This results in two problems: > - mknod is never called for the cdev and hence no cdev appears on > devtmpfs. > - sysfs links to the new cdev are not established. > > The cdev needs to be added and devt assigned before device_add() is > called in order for the relevant sysfs and devtmpfs entries to be > created and the uevent to be properly populated. > Reviewed-by: Bjorn Andersson Regards, Bjorn > Signed-off-by: Siddharth Gupta > --- > drivers/remoteproc/remoteproc_core.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c > index 626a6b90f..562355a 100644 > --- a/drivers/remoteproc/remoteproc_core.c > +++ b/drivers/remoteproc/remoteproc_core.c > @@ -2316,6 +2316,11 @@ int rproc_add(struct rproc *rproc) > struct device *dev = &rproc->dev; > int ret; > > + /* add char device for this remoteproc */ > + ret = rproc_char_device_add(rproc); > + if (ret < 0) > + return ret; > + > ret = device_add(dev); > if (ret < 0) > return ret; > @@ -2329,11 +2334,6 @@ int rproc_add(struct rproc *rproc) > /* create debugfs entries */ > rproc_create_debug_dir(rproc); > > - /* add char device for this remoteproc */ > - ret = rproc_char_device_add(rproc); > - if (ret < 0) > - return ret; > - > /* if rproc is marked always-on, request it to boot */ > if (rproc->auto_boot) { > ret = rproc_trigger_auto_boot(rproc); > -- > Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project >