On 06/22/2018 04:43 PM, Jason Gunthorpe wrote:
On Fri, Jun 22, 2018 at 12:46:11PM -0400, Stefan Berger wrote:
Implement tpm_chip_find() for other subsystems to find a TPM chip and
get a reference to that chip.
Signed-off-by: Stefan Berger <[email protected]>
drivers/char/tpm/tpm-chip.c | 27 +++++++++++++++++++++++++++
include/linux/tpm.h | 5 +++++
2 files changed, 32 insertions(+)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 4e83695af068..2520555b1e17 100644
+++ b/drivers/char/tpm/tpm-chip.c
@@ -81,6 +81,33 @@ void tpm_put_ops(struct tpm_chip *chip)
EXPORT_SYMBOL_GPL(tpm_put_ops);
/**
+ * tpm_chip_find() - find a TPM chip and get a reference to it
+ */
+struct tpm_chip *tpm_chip_find(void)
I feel like this should be called 'tpm_default_chip()'
+{
+ struct tpm_chip *chip, *res = NULL;
+ int chip_num = 0;
+ int chip_prev;
+
+ mutex_lock(&idr_lock);
+
+ do {
+ chip_prev = chip_num;
+ chip = idr_get_next(&dev_nums_idr, &chip_num);
+ if (chip) {
+ get_device(&chip->dev);
+ res = chip;
+ break;
+ }
+ } while (chip_prev != chip_num);
+
+ mutex_unlock(&idr_lock);
And what was tpm_chip_find_get should just call this function..
And then after that each time tpm_get_ops() ?
Jason
