Re: [PATCH] usb: dwc3: gadget: remove warning during kernel boot

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On 2/20/2024 2:04 PM, Greg KH wrote:
On Tue, Feb 20, 2024 at 04:12:04PM +0800, Ray Chi wrote:
The dwc3->gadget_driver is not initialized during the dwc3 probe
process. This leads to a warning when the runtime power management (PM)
attempts to suspend the gadget using dwc3_gadget_suspend().

What type of warning happens?

This patch adds a check to prevent the warning.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 61a348857e86 ("usb: dwc3: gadget: Fix NULL pointer dereference in dwc3_gadget_suspend")
Signed-off-by: Ray Chi <raychi@xxxxxxxxxx>
---
  drivers/usb/dwc3/gadget.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 28f49400f3e8..de987cffe1ec 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4708,6 +4708,9 @@ int dwc3_gadget_suspend(struct dwc3 *dwc)
  	unsigned long flags;
  	int ret;
+ if (!dwc->gadget_driver)
+		return 0;
+

This directly reverts part of the commit you say this fixes, are you
SURE about this?  Why?


Hi Ray,

Thinh sent a patch recently addressing the issue in soft disconnect.
Can you check if it helps:

https://lore.kernel.org/all/e3be9b929934e0680a6f4b8f6eb11b18ae9c7e07.1708043922.git.Thinh.Nguyen@xxxxxxxxxxxx/

Regards,
Krishna,




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