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From: Lizhi Hou <lizhi.hou@xilinx.com>
To: Tom Rix <trix@redhat.com>, Lizhi Hou <lizhi.hou@xilinx.com>,
	<linux-kernel@vger.kernel.org>
Cc: <linux-fpga@vger.kernel.org>, <maxz@xilinx.com>,
	<sonal.santan@xilinx.com>, <yliu@xilinx.com>,
	<michal.simek@xilinx.com>, <stefanos@xilinx.com>,
	<devicetree@vger.kernel.org>, <mdf@kernel.org>, <robh@kernel.org>,
	Max Zhen <max.zhen@xilinx.com>
Subject: Re: [PATCH V6 XRT Alveo 08/20] fpga: xrt: driver infrastructure
Date: Wed, 19 May 2021 19:48:17 -0700	[thread overview]
Message-ID: <f0dfe5ee-d4ac-895f-1ba6-136cd897ba08@xilinx.com> (raw)
In-Reply-To: <c6ed9349-1a9a-62a9-521f-a12ec8c4a5a5@redhat.com>



On 05/13/2021 08:27 AM, Tom Rix wrote:
>
> On 5/11/21 6:53 PM, Lizhi Hou wrote:
>> Infrastructure code providing APIs for managing leaf driver instance
>> groups, facilitating inter-leaf driver calls and root calls.
>>
>> Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
>> Signed-off-by: Max Zhen <max.zhen@xilinx.com>
>> Signed-off-by: Lizhi Hou <lizhi.hou@xilinx.com>
>> Reviewed-by: Tom Rix <trix@redhat.com>
>
>> +
>> +int xrt_subdev_root_request(struct xrt_device *self, u32 cmd, void 
>> *arg)
>> +{
>> +     struct device *dev = DEV(self);
>> +     struct xrt_subdev_platdata *pdata = DEV_PDATA(self);
>> +
>> +     WARN_ON(!pdata->xsp_root_cb);
>> +     return (*pdata->xsp_root_cb)(dev->parent, 
>> pdata->xsp_root_cb_arg, cmd, arg);
>
> I am running v6 through clang's static analyzer.
>
> It reports this problem
>
> drivers/fpga/xrt/lib/subdev.c:72:9: warning: Called function pointer is
> null (null dereference)
>         return (*pdata->xsp_root_cb)(dev->parent,
> pdata->xsp_root_cb_arg, cmd, arg);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Though there is a warn_on, can you also add a
>
> return -EINVAL;
>
> To cover this case?
Sure. I will run through clang myself to check the fix.

Thanks,
Lizhi
>
> Tom
>
>> +}
>


  reply	other threads:[~2021-05-20  2:48 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-12  1:53 [PATCH V6 XRT Alveo 00/20] XRT Alveo driver overview Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 01/20] Documentation: fpga: Add a document describing XRT Alveo drivers Lizhi Hou
2021-05-17 14:22   ` Tom Rix
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 02/20] fpga: xrt: driver metadata helper functions Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 03/20] fpga: xrt: xclbin file " Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 04/20] fpga: xrt: xrt-lib driver manager Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 05/20] fpga: xrt: group driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 06/20] fpga: xrt: char dev node helper functions Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 07/20] fpga: xrt: root driver infrastructure Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 08/20] fpga: xrt: " Lizhi Hou
2021-05-13 15:27   ` Tom Rix
2021-05-20  2:48     ` Lizhi Hou [this message]
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 09/20] fpga: xrt: management physical function driver (root) Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 10/20] fpga: xrt: main driver for management function device Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 11/20] fpga: xrt: fpga-mgr and region implementation for xclbin download Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 12/20] fpga: xrt: VSEC driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 13/20] fpga: xrt: User Clock Subsystem driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 14/20] fpga: xrt: ICAP driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 15/20] fpga: xrt: devctl xrt driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 16/20] fpga: xrt: clock driver Lizhi Hou
2021-05-13 15:48   ` Tom Rix
2021-05-20  2:49     ` Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 17/20] fpga: xrt: clock frequency counter driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 18/20] fpga: xrt: DDR calibration driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 19/20] fpga: xrt: partition isolation driver Lizhi Hou
2021-05-12  1:53 ` [PATCH V6 XRT Alveo 20/20] fpga: xrt: Kconfig and Makefile updates for XRT drivers Lizhi Hou

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