linux-kernel - Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 17 Dec 2019 09:31:08 +0800
From:   cang@...eaurora.org
To:     Bart Van Assche <bvanassche@....org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

On 2019-12-17 09:15, Bart Van Assche wrote:
> On 12/16/19 4:46 PM, cang@...eaurora.org wrote:
>> On 2019-12-17 01:39, Bart Van Assche wrote:
>>> Apparently some UFS drivers call ufshcd_remove() only and others
>>> (PCIe) call both ufshcd_remove() and ufshcd_dealloc_host(). I think
>>> that the above change will cause trouble for the PCIe driver unless
>>> the ufshcd_dealloc_host() call is removed from ufshcd_pci_remove().
>> 
>> You may get me wrong. I mean we should do like what ufshcd-pci.c does.
>> As driver probe routine allocates SCSI host, then driver remove() 
>> should
>> de-allocate it. Meaning ufs_qcom_remove() should call both 
>> ufshcd_remove()
>> and ufshcd_dealloc_host().
>> 
>> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> index 3d4582e..ea45756 100644
>> --- a/drivers/scsi/ufs/ufs-qcom.c
>> +++ b/drivers/scsi/ufs/ufs-qcom.c
>> @@ -3239,6 +3239,7 @@ static int ufs_qcom_remove(struct 
>> platform_device *pdev)
>> 
>>            pm_runtime_get_sync(&(pdev)->dev);
>>            ufshcd_remove(hba);
>>   +       ufshcd_dealloc_host(hba);
>>            return 0;
>>     }
> 
> Hi Can,
> 
> If it is possible to move the ufshcd_dealloc_host() into
> ufshcd_remove() then I would prefer to do that. If all UFS transport
> drivers need that call then I think that call should happen from the
> UFS core instead of from the transport drivers.
> 
> Thanks,
> 
> Bart.

Yeah, that is an once for all solution, but I not sure if PCI folks are
OK if I remove the ufshcd_dealloc_host() call from their driver.
In next version, I will try to make such change and see.

Thanks,
Can Guo.