Re: [RFC PATCH 1/5] usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd()

Hi Greg,

On 24/08/21 6:36 pm, Greg Kroah-Hartman wrote:

On Tue, Aug 24, 2021 at 04:22:58PM +0530, Kishon Vijay Abraham I wrote:

quoted

No functional change. Since configuration to stop HCD is invoked from
multiple places, group all of them in usb_stop_hcd().

Signed-off-by: Kishon Vijay Abraham I <redacted>
---
 drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 0f8b7c93310e..c036ba5311b3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c

@@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
 	usb_put_dev(rhdev);
 }
 
+/**
+ * usb_stop_hcd - Halt the HCD
+ * @hcd: the usb_hcd that has to be halted
+ *
+ * Stop the timer and invoke ->stop() callback on the HCD
+ */
+static void usb_stop_hcd(struct usb_hcd *hcd)
+{
+	if (!hcd)
+		return;

That's impossible to hit, so no need to check for it, right?

Patch 3 of this series adds support for registering roothub of shared
HCD. So after that patch there can be a case where shared_hcd is NULL.
The other option would be to check for non-null value in hcd and then
invoke usb_stop_hcd().

Thanks
Kishon