linux-kernel - Re: [PATCH v5 01/58] mtd: nand: denali: add missing nand_release() call in denali

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Message-ID: <CADhT+wcNFxD6Zv9w8W0sontVWa6zOkHjyK42Tw=Y_1X2XCTZfQ@mail.gmail.com>
Date:	Fri, 11 Dec 2015 10:50:21 -0600
From:	Dinh Nguyen <dinh.linux@...il.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org, Andrew Lunn <andrew@...n.ch>,
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	Daniel Mack <daniel@...que.org>
Subject: Re: [PATCH v5 01/58] mtd: nand: denali: add missing nand_release()
 call in denali_remove()

Hi Boris,

On Fri, Dec 11, 2015 at 9:10 AM, Boris Brezillon
<boris.brezillon@...e-electrons.com> wrote:
> + Dinh (who made commit 2a0a288ec258)
>
> Also added back the Fixes tag.
>
> On Fri, 11 Dec 2015 15:02:34 +0100
> Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:
>
>> Unregister the NAND device from the NAND subsystem when removing a denali
>> NAND controller, otherwise the MTD attached to the NAND device is still
>> exposed by the MTD layer, and accesses to this device will likely crash
>> the system.
>>
>> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
>
> Fixes: 2a0a288ec258 ("mtd: denali: split the generic driver and PCI layer")
>
>> ---
>> Changes since v4:
>> - remove Cc stable and fixes tags
>> - calculate the dma buffer size before calling nand_release()
>>
>>  drivers/mtd/nand/denali.c | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
>> index 67eb2be..fdfea05 100644
>> --- a/drivers/mtd/nand/denali.c
>> +++ b/drivers/mtd/nand/denali.c
>> @@ -1622,9 +1622,11 @@ EXPORT_SYMBOL(denali_init);
>>  /* driver exit point */
>>  void denali_remove(struct denali_nand_info *denali)
>>  {
>> +     int bufsize = denali->mtd.writesize + denali->mtd.oobsize;
>> +
>> +     nand_release(&denali->mtd);
>>       denali_irq_cleanup(denali->irq, denali);
>> -     dma_unmap_single(denali->dev, denali->buf.dma_buf,
>> -                      denali->mtd.writesize + denali->mtd.oobsize,
>> +     dma_unmap_single(denali->dev, denali->buf.dma_buf, bufsize,
>>                        DMA_BIDIRECTIONAL);

Not sure what is the need to add bufsize here, but the commit message
doesn't reflect the change.

Dinh
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