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SubjectRe: [PATCH v2 1/4] tpm: Implement tpm_chip_find() and tpm_chip_put() for other subsystems
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On 06/20/2018 04:50 PM, Jason Gunthorpe wrote:
> On Wed, Jun 20, 2018 at 04:42:33PM -0400, Stefan Berger wrote:
>> Implement tpm_chip_find() for other subsystems to find a TPM chip and
>> get a reference to that chip. Once done with using the chip, the reference
>> is released using tpm_chip_put().
>>
>> Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
>> drivers/char/tpm/tpm-chip.c | 37 +++++++++++++++++++++++++++++++++++++
>> include/linux/tpm.h | 9 +++++++++
>> 2 files changed, 46 insertions(+)
>>
>> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
>> index 0a62c19937b6..eaaf41ce73d8 100644
>> +++ b/drivers/char/tpm/tpm-chip.c
>> @@ -81,6 +81,43 @@ void tpm_put_ops(struct tpm_chip *chip)
>> EXPORT_SYMBOL_GPL(tpm_put_ops);
>>
>> /**
>> + * tpm_chip_put() - Release a ref to the tpm_chip
>> + * @chip: Chip to put
>> + */
>> +void tpm_chip_put(struct tpm_chip *chip)
>> +{
>> + if (chip)
>> + put_device(&chip->dev);
> Rarely like to see those if's inside a put function.. Does it actually
> help anything?
Following put_device() 'pattern' here which also checks using 'if (dev)'.

    Stefan

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