sizeof(buf) is 8 bytes because it is defined as unsigned char *buf, each SMI event read only copy max 8 bytes to user buffer. Correct this by using the buf allocate size.
Signed-off-by: Philip Yang <philip.y...@amd.com> --- drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c index 329a4c89f1e6..18ed1b72f0f7 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c @@ -81,7 +81,8 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user, struct kfd_smi_client *client = filep->private_data; unsigned char *buf; - buf = kmalloc_array(MAX_KFIFO_SIZE, sizeof(*buf), GFP_KERNEL); + size = min_t(size_t, size, MAX_KFIFO_SIZE); + buf = kmalloc(size, GFP_KERNEL); if (!buf) return -ENOMEM; @@ -95,7 +96,7 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user, ret = -EAGAIN; goto ret_err; } - to_copy = min3(size, sizeof(buf), to_copy); + to_copy = min(size, to_copy); ret = kfifo_out(&client->fifo, buf, to_copy); spin_unlock(&client->lock); if (ret <= 0) { -- 2.17.1