linux-kernel - Re: [PATCH 1/2] USB: core: add a memory pool to urb for host-controller private data

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Message-ID: <3fa2cbc3-fe81-4364-96c1-b753c52ddc16@suse.com>
Date: Tue, 13 May 2025 13:02:42 +0200
From: Oliver Neukum <oneukum@...e.com>
To: David Wang <00107082@....com>, Oliver Neukum <oneukum@...e.com>
Cc: mathias.nyman@...el.com, gregkh@...uxfoundation.org,
 stern@...land.harvard.edu, surenb@...gle.com, kent.overstreet@...ux.dev,
 linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] USB: core: add a memory pool to urb for
 host-controller private data



On 13.05.25 11:49, David Wang wrote:

> Hi, I have one question about mem flags.
> If usb_submit_urb wants a memory in context of flags A, say GFP_ATOMIC, but I already have a memory alloc with  flags B  and its size
> is big enough,  is it safe to return this memory  to usb_submit_urb  which is in the context of flags A?

Yes, that is perfectly safe.

	HTH
		Oliver