linux-kernel - Re: [PATCH 3/3] [media] au0828-video: Move two assignments in au0828_init

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Date:   Thu, 3 Nov 2016 20:56:49 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rafael Lourenço de Lima Chehab 
        <chehabrafael@...il.com>, Shuah Khan <shuah@...nel.org>,
        Wolfram Sang <wsa-dev@...g-engineering.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/3] [media] au0828-video: Move two assignments in
 au0828_init_isoc()

>> From: Markus Elfring <elfring@...rs.sourceforge.net>
>> Date: Mon, 24 Oct 2016 22:44:02 +0200
>>
>> Move the assignment for the data structure members "isoc_copy"
>> and "num_bufs" behind the source code for memory allocations
>> by this function.
> 
> I don't see the point,

Another explanation try …


> dropping this patch.

I proposed that these assignments should only be performed after the required
memory allocations succeeded. Is this detail worth for further considerations?


>> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
>> ---
>>  drivers/media/usb/au0828/au0828-video.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/media/usb/au0828/au0828-video.c b/drivers/media/usb/au0828/au0828-video.c
>> index b5c88a7..5ebda64 100644
>> --- a/drivers/media/usb/au0828/au0828-video.c
>> +++ b/drivers/media/usb/au0828/au0828-video.c
>> @@ -218,9 +218,6 @@ static int au0828_init_isoc(struct au0828_dev *dev, int max_packets,
>>      int rc;
>>
>>      au0828_isocdbg("au0828: called au0828_prepare_isoc\n");
>> -
>> -    dev->isoc_ctl.isoc_copy = isoc_copy;
>> -    dev->isoc_ctl.num_bufs = num_bufs;
>>      dev->isoc_ctl.urb = kcalloc(num_bufs,
>>                      sizeof(*dev->isoc_ctl.urb),
>>                      GFP_KERNEL);
>> @@ -240,6 +237,7 @@ static int au0828_init_isoc(struct au0828_dev *dev, int max_packets,
>>      dev->isoc_ctl.buf = NULL;
>>
>>      sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
>> +    dev->isoc_ctl.num_bufs = num_bufs;
>>
>>      /* allocate urbs and transfer buffers */
>>      for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
>> @@ -276,6 +274,7 @@ static int au0828_init_isoc(struct au0828_dev *dev, int max_packets,
>>              k += dev->isoc_ctl.max_pkt_size;
>>          }
>>      }
>> +    dev->isoc_ctl.isoc_copy = isoc_copy;
>>
>>      /* submit urbs and enables IRQ */
>>      for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
>>