linux-kernel - Re: [PATCH v2] dgnc: Don't save boards in memory that have failed to initialize

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Date:	Thu, 12 Mar 2015 18:14:15 +0200
From:	Giedrius Statkevičius 
	<giedrius.statkevicius@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	lidza.louina@...il.com, markh@...pro.net,
	devel@...verdev.osuosl.org, driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org, dan.carpenter@...cle.com
Subject: Re: [PATCH v2] dgnc: Don't save boards in memory that have failed
 to initialize

On 2015.03.12 12:08, Greg KH wrote:
> On Mon, Mar 09, 2015 at 06:29:38PM +0200, Giedrius Statkevičius wrote:
>> Remove BOARD_FAILED and don't save dgnc_boards which failed to
>> initialize.
>>
>> Assign the result of kzalloc() to brd in dgnc_found_board() and only put
>> it in the dgnc_Board[] if it successfully initializes. Also, remove
>> BOARD_FAILED enum and all ifs that check for it. Finally, remove one
>> final place where state was set to BOARD_FAILED which was even redundant
>> before this patch.
>>
>> Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@...il.com>
>> ---
>> v2: Remove "brd = dgnc_Board[dgnc_NumBoards];" line which I forgot to do
>> in the first version
>>
>>  drivers/staging/dgnc/dgnc_driver.c | 20 ++------------------
>>  drivers/staging/dgnc/dgnc_driver.h |  3 +--
>>  drivers/staging/dgnc/dgnc_mgmt.c   |  5 +----
>>  drivers/staging/dgnc/dgnc_tty.c    |  8 --------
>>  4 files changed, 4 insertions(+), 32 deletions(-)
>>
>> diff --git a/drivers/staging/dgnc/dgnc_driver.c b/drivers/staging/dgnc/dgnc_driver.c
>> index fa1ee79..075727d 100644
>> --- a/drivers/staging/dgnc/dgnc_driver.c
>> +++ b/drivers/staging/dgnc/dgnc_driver.c
>> @@ -401,8 +401,7 @@ static int dgnc_found_board(struct pci_dev *pdev, int id)
>>  	unsigned long flags;
>>  
>>  	/* get the board structure and prep it */
>> -	dgnc_Board[dgnc_NumBoards] = kzalloc(sizeof(*brd), GFP_KERNEL);
>> -	brd = dgnc_Board[dgnc_NumBoards];
>> +	brd = kzalloc(sizeof(*brd), GFP_KERNEL);
> 
> You've done a great job here, but...
> 
> Yeah, sorry...
> 
> I really want to see this whole "static list of boards/cards" go away.
> There should not be any need for that in any in-kernel driver.  Your
> patch here is a sign that things are really wrong with this whole static
> array mess.
> 
> So could you do that instead?  I don't want to take patches around this
> whole "board state" mess anymore, as it should all not be needed at all.
> 
> If you need pointers on what needs to be done here, just let me know.
> 
> thanks,
> 
> greg k-h
> 

I can try :) But my main concern is the lack of dgnc driver maintainers
activity and that I don't own the hardware this driver is written for as
it's quite expensive (cheapest cards I've found start at 300$~) and I
can't afford it ATM. But I guess if I keep the patches small and logical
everything will be okay.

-- 
Thanks,
Giedrius
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