linux-kernel - Re: 答复: [PATCH] usb: gadget: u_serial: check Null pointer in EP callback

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Message-ID: <2024081629-nebulizer-harvest-2303@gregkh>
Date: Fri, 16 Aug 2024 13:57:03 +0200
From: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To: 胡连勤 <hulianqin@...o.com>
Cc: "quic_prashk@...cinc.com" <quic_prashk@...cinc.com>,
	"quic_jjohnson@...cinc.com" <quic_jjohnson@...cinc.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"opensource.kernel" <opensource.kernel@...o.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: 答复: [PATCH] usb: gadget:
 u_serial: check Null pointer in EP callback

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Fri, Aug 16, 2024 at 11:16:08AM +0000, 胡连勤 wrote:
> Hello linux community expert:
> 
> Q: What is causing driver_data to be NULL?  And what protects it from happening right after you check for it?
> A: This is a very in-depth question, and I need to have a deeper understanding of the code before I can answer it. 
>   Judging from the crash stack, this patch currently has improved the crash problem.

Please figure this out, we can't take changes that don't actually fix
the root problem for obvious reasons (and you wouldn't want us to
either.)

thanks,

greg k-h