linux-kernel - [PATCH] tee: correct max value for id allocation

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Date:   Mon, 15 Jan 2018 17:27:35 +0800
From:   Peng Fan <peng.fan@....com>
To:     jens.wiklander@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-imx@....com,
        van.freenix@...il.com, Peng Fan <peng.fan@....com>
Subject: [PATCH] tee: correct max value for id allocation

The privileged dev id range is [TEE_NUM_DEVICES / 2, TEE_NUM_DEVICES).
The non-privileged dev id range is [0, TEE_NUM_DEVICES / 2).

So when finding a slot for them, need to use different max value.

Signed-off-by: Peng Fan <peng.fan@....com>
Cc: Jens Wiklander <jens.wiklander@...aro.org>
---
 drivers/tee/tee_core.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 3d49ac2e3c84..d1f4ecdbc8cc 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -701,7 +701,7 @@ struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
 {
 	struct tee_device *teedev;
 	void *ret;
-	int rc;
+	int rc, max_id;
 	int offs = 0;
 
 	if (!teedesc || !teedesc->name || !teedesc->ops ||
@@ -715,16 +715,20 @@ struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
 		goto err;
 	}
 
-	if (teedesc->flags & TEE_DESC_PRIVILEGED)
+	max_id = TEE_NUM_DEVICES / 2;
+
+	if (teedesc->flags & TEE_DESC_PRIVILEGED) {
 		offs = TEE_NUM_DEVICES / 2;
+		max_id = TEE_NUM_DEVICES;
+	}
 
 	spin_lock(&driver_lock);
-	teedev->id = find_next_zero_bit(dev_mask, TEE_NUM_DEVICES, offs);
-	if (teedev->id < TEE_NUM_DEVICES)
+	teedev->id = find_next_zero_bit(dev_mask, max_id, offs);
+	if (teedev->id < max_id)
 		set_bit(teedev->id, dev_mask);
 	spin_unlock(&driver_lock);
 
-	if (teedev->id >= TEE_NUM_DEVICES) {
+	if (teedev->id >= max_id) {
 		ret = ERR_PTR(-ENOMEM);
 		goto err;
 	}
-- 
2.14.1