linux-kernel - RE: RE: [EXT] [PATCH] scsi: ufs-bsg: Fix runtime PM imbalance on error

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Date:   Fri, 22 May 2020 14:55:43 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     "dinghao.liu@....edu.cn" <dinghao.liu@....edu.cn>
CC:     "kjlu@....edu" <kjlu@....edu>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>,
        Can Guo <cang@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: RE: [EXT] [PATCH] scsi: ufs-bsg: Fix runtime PM imbalance on
 error

Hi, Dinghao

> Thank you for your advice! Moving original pm_runtime_put_sync() to after
> "out" label will influence an error path branched from
> ups_bsg_verify_query_size(). So I think changing "goto out" to "break" is a good
> idea. But in this case we may execute an extra
> sg_copy_from_buffer() and an extra kfree() compared with unpatched version.
> Does this matter?
> 
What do you mean " unpatched version "? 

I see, below goto will bypass sg_copy_from_buffer() and an extra kfree()
In case ufs_bsg_alloc_desc_buffer() fails. 

Bean