Messages in this thread | | | Date | Wed, 1 Jul 2015 15:06:05 -0700 | From | Dmitry Torokhov <> | Subject | Re: [PATCH] tpm: Fix initialization of the cdev |
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On Tue, Jun 30, 2015 at 01:15:31PM -0600, Jason Gunthorpe wrote: > When a cdev is contained in a dynamic structure the cdev parent kobj > should be set to the kobj that controls the lifetime of the enclosing > structure. In TPM's case this is the embedded struct device. > > Also, cdev_init 0's the whole structure, so all sets must be after, > not before. This fixes module ref counting and cdev. > > Fixes: 313d21eeab92 ("tpm: device class for tpm") > Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Right, when embedding cdev its lifetime should be tied to the lifetime of the enclosing structure.
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> --- > drivers/char/tpm/tpm-chip.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > Peter, I've only compile tests this. Thanks > > diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c > index 283f00a7f036..1082d4bb016a 100644 > --- a/drivers/char/tpm/tpm-chip.c > +++ b/drivers/char/tpm/tpm-chip.c > @@ -129,8 +129,9 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev, > > device_initialize(&chip->dev); > > - chip->cdev.owner = chip->pdev->driver->owner; > cdev_init(&chip->cdev, &tpm_fops); > + chip->cdev.owner = chip->pdev->driver->owner; > + chip->cdev.kobj.parent = &chip->dev.kobj; > > return chip; > } > -- > 2.1.4 > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Dmitry
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