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drm/amd/amdkfd: Fix large framesize for kfd_smi_ev_read() 

The buffer allocated is of 1024 bytes. Allocate this from
heap instead of stack.

Also remove check for stack size since we're allocating from heap

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Aurabindo Pillai 2020-05-19 16:48:43 -04:00 committed by Alex Deucher
parent 91e2c19192
commit 6e14adea0a
1 changed files with 19 additions and 7 deletions
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26
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
View File

@ -78,9 +78,11 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
int ret;
size_t to_copy;
struct kfd_smi_client *client = filep->private_data;
unsigned char buf[MAX_KFIFO_SIZE];
unsigned char *buf;
BUILD_BUG_ON(MAX_KFIFO_SIZE > 1024);
buf = kmalloc(MAX_KFIFO_SIZE * sizeof(*buf), GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* kfifo_to_user can sleep so we can't use spinlock protection around
* it. Instead, we kfifo out as spinlocked then copy them to the user.
@ -89,19 +91,29 @@ static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
to_copy = kfifo_len(&client->fifo);
if (!to_copy) {
spin_unlock(&client->lock);
return -EAGAIN;
ret = -EAGAIN;
goto ret_err;
}
to_copy = min3(size, sizeof(buf), to_copy);
ret = kfifo_out(&client->fifo, buf, to_copy);
spin_unlock(&client->lock);
if (ret <= 0)
return -EAGAIN;
if (ret <= 0) {
ret = -EAGAIN;
goto ret_err;
}
ret = copy_to_user(user, buf, to_copy);
if (ret)
return -EFAULT;
if (ret) {
ret = -EFAULT;
goto ret_err;
}
kfree(buf);
return to_copy;
ret_err:
kfree(buf);
return ret;
}
static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,