From: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
When copy_from_user() returns an error code, there
is a runtime PM usage counter imbalance.
Fix this by moving copy_from_user() to the beginning
of this function.
Fixes: 7b6c1b4c0e1e ("usb: musb: fix runtime PM in debugfs")
Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Bin Liu <b-liu@xxxxxx>
---
drivers/usb/musb/musb_debugfs.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/musb/musb_debugfs.c b/drivers/usb/musb/musb_debugfs.c
index 7b6281ab62ed..30a89aa8a3e7 100644
--- a/drivers/usb/musb/musb_debugfs.c
+++ b/drivers/usb/musb/musb_debugfs.c
@@ -168,6 +168,11 @@ static ssize_t musb_test_mode_write(struct file *file,
u8 test;
char buf[24];
+ memset(buf, 0x00, sizeof(buf));
+
+ if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
pm_runtime_get_sync(musb->controller);
test = musb_readb(musb->mregs, MUSB_TESTMODE);
if (test) {
@@ -176,11 +181,6 @@ static ssize_t musb_test_mode_write(struct file *file,
goto ret;
}
- memset(buf, 0x00, sizeof(buf));
-
- if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
- return -EFAULT;
-
if (strstarts(buf, "force host full-speed"))
test = MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_FS;
--
2.17.1
