linux-kernel - Re: [PATCH] scsi: ufs: Fix registers dump vops caused scheduling while atomic

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Date:   Wed, 05 Feb 2020 14:31:45 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, rnayak@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        saravanak@...gle.com, salyzyn@...gle.com,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        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>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: ufs: Fix registers dump vops caused scheduling
 while atomic

On 2020-02-05 14:21, Bart Van Assche wrote:
> On 2020-02-04 22:06, Can Guo wrote:
>> @@ -5617,7 +5622,7 @@ static irqreturn_t ufshcd_check_errors(struct
>> 
>>  					__func__, hba->saved_err,
>>  					hba->saved_uic_err);
>> 
>> -				ufshcd_print_host_regs(hba);
>> +				__ufshcd_print_host_regs(hba, true);
>>  				ufshcd_print_pwr_info(hba);
>>  				ufshcd_print_tmrs(hba,
>> 					hba->outstanding_tasks);
>>  				ufshcd_print_trs(hba,
>> 					hba->outstanding_reqs,
> 
> Hi Can,
> 
> Please fix this by splitting ufs_qcom_dump_dbg_regs() into two
> functions: one function that doesn't sleep and a second function that
> behaves identically to the current function. If the function names will
> make it clear which function sleeps and which function doesn't that 
> will
> result in code that is much easier to read than the above code. For the
> above code it is namely impossible to figure out what will happen
> without looking up the caller.
> 
> Thanks,
> 
> Bart.

Hi Bart,

Do you mean by splitting ufshcd_print_host_regs() into two functions?
One behaves identically same to the current function, another one called
ufshcd_print_host_regs_nosleep(). No?

Thanks,
Can Guo.