[v5,3/5] tpm: Convert tpm_find_get_ops() to use tpm_default_chip()

Commit Message

Stefan Berger June 26, 2018, 11:06 a.m. UTC

Convert tpm_find_get_ops() to use tpm_default_chip() in case no chip
is passed in.

Signed-off-by: Stefan Berger <[e-mail]>
---
 drivers/char/tpm/tpm-chip.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

Comments

Jarkko Sakkinen June 26, 2018, 1:24 p.m. UTC | #1

On Tue, 2018-06-26 at 07:06 -0400, Stefan Berger wrote:
> Convert tpm_find_get_ops() to use tpm_default_chip() in case no chip
> is passed in.
> 
> Signed-off-by: Stefan Berger <[e-mail]>

Reviewed-by: Jarkko Sakkinen <[e-mail]>

/Jarkko
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Patch

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index f551061262c9..b01d34983766 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -124,29 +124,23 @@  EXPORT_SYMBOL_GPL(tpm_default_chip);
  */
 struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip)
 {
-	struct tpm_chip *res = NULL;
-	int chip_num = 0;
-	int chip_prev;
-
-	mutex_lock(&idr_lock);
+	int rc;
 
-	if (!chip) {
-		do {
-			chip_prev = chip_num;
-			chip = idr_get_next(&dev_nums_idr, &chip_num);
-			if (chip && !tpm_try_get_ops(chip)) {
-				res = chip;
-				break;
-			}
-		} while (chip_prev != chip_num);
-	} else {
+	if (chip) {
 		if (!tpm_try_get_ops(chip))
-			res = chip;
+			return chip;
+		return NULL;
 	}
 
-	mutex_unlock(&idr_lock);
-
-	return res;
+	chip = tpm_default_chip();
+	if (!chip)
+		return NULL;
+	rc = tpm_try_get_ops(chip);
+	/* release additional reference we got from tpm_default_chip() */
+	put_device(&chip->dev);
+	if (!rc)
+		return NULL;
+	return chip;
 }
 
 /**