Hi Brian,
On Thu, 10 Dec 2015 16:40:08 -0800
Brian Norris <computersforpeace@xxxxxxxxx> wrote:
> On Thu, Dec 10, 2015 at 08:59:45AM +0100, Boris Brezillon 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@xxxxxxxxxxxxxxxxxx>
> > Cc: <stable@xxxxxxxxxxxxxxx> #3.8+
>
> Does this follow these rules, from
> Documentation/stable_kernel_rules.txt?
>
> - It must be obviously correct and tested.
>
> - It must fix a real bug that bothers people (not a, "This could be a
> problem..." type thing).
As you wish, I'll remove those Cc and Fixes tags, or just drop the
patch if you think it's useless...
I just noticed the bug while reworking this series, and thought it
would be useful to fix it, but I honestly don't care if it's applied
or not (I don't use this platform).
>
> > Fixes: 2a0a288ec258 ("mtd: denali: split the generic driver and PCI layer")
> > ---
> > drivers/mtd/nand/denali.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
> > index 67eb2be..8feece3 100644
> > --- a/drivers/mtd/nand/denali.c
> > +++ b/drivers/mtd/nand/denali.c
> > @@ -1622,6 +1622,7 @@ EXPORT_SYMBOL(denali_init);
> > /* driver exit point */
> > void denali_remove(struct denali_nand_info *denali)
> > {
> > + 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,
>
> It feels a bit odd to allow usage of MTD fields after it has been
> unregistered. Maybe precompute this before the nand_release()?
nand_realease() is not releasing the mtd instance or re-initialazing
its field, so it should be safe, but I agree that pre-computing the DMA
buffer size is more future-proof.
I'll fix that, send a v5 and let you decide whether it's needed or not.
Best Regards,
Boris
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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