[PATCH v2 1/1] tpm: call tpm_tis_wait_init() after tpm_tis_init()

[lukas.funke-oss at weidmueller.com]

From: Lukas Funke <lukas.funke at weidmueller.com>

tpm_tis_wait_init() is using the 'chip->timeout_b' field which is
initialized in tpm_tis_init(). However, the init-function is called
*after* tpm_tis_wait_init() introducing an uninitalized field access.

This commit switches both routines.

Signed-off-by: Lukas Funke <lukas.funke at weidmueller.com>
Acked-by: Miquel Raynal <miquel.raynal at bootlin.com>
---

Changes in v2:
- Call tpm_tis_wait_init() from tpm_tis_init()
- Use phy_ops for bus access in tpm_tis_wait_init()

 drivers/tpm/tpm2_tis_core.c | 28 ++++++++++++++++++++++++++++
 drivers/tpm/tpm2_tis_spi.c  | 29 -----------------------------
 2 files changed, 28 insertions(+), 29 deletions(-)

diff --git a/drivers/tpm/tpm2_tis_core.c b/drivers/tpm/tpm2_tis_core.c
index 680a6409433..1fdf8cfa319 100644
--- a/drivers/tpm/tpm2_tis_core.c
+++ b/drivers/tpm/tpm2_tis_core.c
@@ -419,6 +419,28 @@ static bool tis_check_ops(struct tpm_tis_phy_ops *phy_ops)
 	return true;
 }
 
+static int tpm_tis_wait_init(struct udevice *dev, int loc)
+{
+	struct tpm_chip *chip = dev_get_priv(dev);
+	unsigned long start, stop;
+	u8 status;
+	int ret;
+
+	start = get_timer(0);
+	stop = chip->timeout_b;
+	do {
+		mdelay(TPM_TIMEOUT_MS);
+		ret = chip->phy_ops->read_bytes(dev, TPM_ACCESS(loc), 1, &status);
+		if (ret)
+			break;
+
+		if (status & TPM_ACCESS_VALID)
+			return 0;
+	} while (get_timer(start) < stop);
+
+	return -EIO;
+}
+
 int tpm_tis_init(struct udevice *dev)
 {
 	struct tpm_chip *chip = dev_get_priv(dev);
@@ -436,6 +458,12 @@ int tpm_tis_init(struct udevice *dev)
 	chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
 	chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
 
+	ret = tpm_tis_wait_init(dev, chip->locality);
+	if (ret) {
+		log(LOGC_DM, LOGL_ERR, "%s: no device found\n", __func__);
+		return ret;
+	}
+
 	ret = tpm_tis_request_locality(dev, 0);
 	if (ret)
 		return ret;
diff --git a/drivers/tpm/tpm2_tis_spi.c b/drivers/tpm/tpm2_tis_spi.c
index b0fe97ab1d0..7909a147c2d 100644
--- a/drivers/tpm/tpm2_tis_spi.c
+++ b/drivers/tpm/tpm2_tis_spi.c
@@ -188,29 +188,6 @@ static int tpm_tis_spi_write32(struct udevice *dev, u32 addr, u32 value)
 	return tpm_tis_spi_write(dev, addr, sizeof(value), (u8 *)&value_le);
 }
 
-static int tpm_tis_wait_init(struct udevice *dev, int loc)
-{
-	struct tpm_chip *chip = dev_get_priv(dev);
-	unsigned long start, stop;
-	u8 status;
-	int ret;
-
-	start = get_timer(0);
-	stop = chip->timeout_b;
-	do {
-		mdelay(TPM_TIMEOUT_MS);
-
-		ret = tpm_tis_spi_read(dev, TPM_ACCESS(loc), 1, &status);
-		if (ret)
-			break;
-
-		if (status & TPM_ACCESS_VALID)
-			return 0;
-	} while (get_timer(start) < stop);
-
-	return -EIO;
-}
-
 static struct tpm_tis_phy_ops phy_ops = {
 	.read_bytes = tpm_tis_spi_read,
 	.write_bytes = tpm_tis_spi_write,
@@ -256,12 +233,6 @@ static int tpm_tis_spi_probe(struct udevice *dev)
 	/* Ensure a minimum amount of time elapsed since reset of the TPM */
 	mdelay(drv_data->time_before_first_cmd_ms);
 
-	ret = tpm_tis_wait_init(dev, chip->locality);
-	if (ret) {
-		log(LOGC_DM, LOGL_ERR, "%s: no device found\n", __func__);
-		return ret;
-	}
-
 	tpm_tis_ops_register(dev, &phy_ops);
 	ret = tpm_tis_init(dev);
 	if (ret)
-- 
2.30.2