diff options
| author | Dinghao Liu <[email protected]> | 2020-05-25 02:50:49 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2020-05-25 11:36:31 +0000 |
| commit | e4befc121df03dc8ed2ac1031c98f9538e244bae (patch) | |
| tree | 595552c47681f945812c324b28a3ed2d61cb0dde | |
| parent | usb: musb: jz4740: Prevent lockup when CONFIG_SMP is set (diff) | |
| download | kernel-e4befc121df03dc8ed2ac1031c98f9538e244bae.tar.gz kernel-e4befc121df03dc8ed2ac1031c98f9538e244bae.zip | |
usb: musb: Fix runtime PM imbalance on error
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 <[email protected]>
Cc: [email protected]
Signed-off-by: Bin Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
| -rw-r--r-- | drivers/usb/musb/musb_debugfs.c | 10 |
1 files 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; |