linux-kernel - Re: [PATCH] usb: musb: Remove unnecessary check of musb->hcd in musb_handle_intr

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Date:   Tue, 17 Dec 2019 20:27:09 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     b-liu@...com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: musb: Remove unnecessary check of musb->hcd in
 musb_handle_intr_connect()



On 2019/12/17 17:59, Greg KH wrote:
> On Tue, Dec 17, 2019 at 05:50:23PM +0800, Jia-Ju Bai wrote:
>> In musb_handle_intr_connect(), musb->hcd should be non-null,
>> so the check of musb->hcd on line 783 could be dropped.
> Have you verified that this is always the case?  How did you do that?

Ah, so sorry, I misunderstood your last message...
I have not verified it, but I thought you made sure of it from your last 
message, sorry...

In my opinion, adding an if check is safer, as shown in my last patch:
"usb: musb: Fix a possible null-pointer dereference in 
musb_handle_intr_connect()"

I recall that Bin Liu has applied my last patch:
https://patchwork.kernel.org/patch/11283007/

Maybe we can listen to his opinion or other people's opinions?


Best wishes,
Jia-Ju Bai