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authorPeng Fan <peng.fan@nxp.com>2018-01-15 10:27:35 +0100
committerJens Wiklander <jens.wiklander@linaro.org>2018-03-06 11:03:55 +0100
commit7dd003aec2016e90d33f25f90ad4cebb12224a8a (patch)
tree7792a4ca10be36ad1b288d4568e4e7ec9063b855 /drivers/tee
parentLinux 4.16-rc4 (diff)
downloadlinux-7dd003aec2016e90d33f25f90ad4cebb12224a8a.tar.xz
linux-7dd003aec2016e90d33f25f90ad4cebb12224a8a.zip
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@nxp.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
-rw-r--r--drivers/tee/tee_core.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 6c4b200a4560..0124a91c8d71 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -693,7 +693,7 @@ 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 ||
@@ -707,16 +707,20 @@ 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;
}