[PATCH] tee: correct max value for id allocation

Peng Fan
2018-01-15T09:27:42Z

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@nxp.com>
Cc: Jens Wiklander <jens.wiklander@linaro.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