From: Oliver Neukum <oneukum@suse.com>
To: David Laight <David.Laight@ACULAB.COM>,
'Greg Kroah-Hartman' <gregkh@linuxfoundation.org>
Cc: 'Vincent MAILHOL' <mailhol.vincent@wanadoo.fr>,
Alan Stern <stern@rowland.harvard.edu>,
Marc Kleine-Budde <mkl@pengutronix.de>,
Rhett Aultman <rhett.aultman@samsara.com>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
linux-can <linux-can@vger.kernel.org>,
Oliver Neukum <oneukum@suse.com>
Subject: Re: [PATCH v3 1/2] drivers: usb/core/urb: Add URB_FREE_COHERENT
Date: Wed, 22 Jun 2022 13:11:17 +0200 [thread overview]
Message-ID: <cf10d129-2454-dbc1-e6b0-f7b562f77e49@suse.com> (raw)
In-Reply-To: <186561fa929f459985ad2986936988e5@AcuMS.aculab.com>
On 22.06.22 12:03, David Laight wrote:
> Yes, being able to do short transfers from buffer space in the urb
> would save all the issues about having to allocate an extra
> buffer to avoid DMA from stack.
That is just as hard to do for DMA coherency.
> Indeed for XHCI there is a bit that allows 8 bytes of data to
> replace the pointer in the ring structure itself.
> I don't remember the driver every doing that.
XHCI does use it. There was even a bug with endianness.
Regards
Oliver
next prev parent reply other threads:[~2022-06-22 11:11 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <alpine.DEB.2.22.394.2206031547001.1630869@thelappy>
2022-06-04 2:11 ` [PATCH] can: gs_usb: gs_usb_open/close( ) fix memory leak Vincent Mailhol
2022-06-04 2:26 ` Vincent MAILHOL
2022-06-04 14:08 ` Rhett Aultman
2022-06-04 14:41 ` [RFC PATCH] USB: core: urb: add new transfer flag URB_FREE_COHERENT Vincent Mailhol
2022-06-04 16:40 ` Alan Stern
2022-06-05 2:04 ` Vincent MAILHOL
2022-06-05 6:00 ` Oliver Neukum
2022-06-05 13:45 ` Vincent MAILHOL
2022-06-07 9:49 ` Oliver Neukum
2022-06-07 10:18 ` Vincent MAILHOL
2022-06-07 11:46 ` Oliver Neukum
2022-06-07 12:12 ` Vincent MAILHOL
2022-06-05 2:15 ` [RFC PATCH v2] usb: " Vincent Mailhol
2022-06-04 14:53 ` [PATCH] can: gs_usb: gs_usb_open/close( ) fix memory leak Vincent MAILHOL
2022-06-09 20:47 ` [PATCH v2 0/3] URB_FREE_COHERENT gs_usb memory leak fix Rhett Aultman
2022-06-09 20:47 ` [PATCH v2 1/3] drivers: usb/core/urb: Add URB_FREE_COHERENT Rhett Aultman
2022-06-10 0:18 ` Vincent MAILHOL
2022-06-10 10:46 ` Marc Kleine-Budde
2022-06-09 20:47 ` [PATCH v2 2/3] drivers: usb/core/urb: allow URB_FREE_COHERENT Rhett Aultman
2022-06-09 23:18 ` Vincent Mailhol
2022-06-09 20:47 ` [PATCH v2 3/3] can: gs_usb: fix DMA memory leak on close Rhett Aultman
2022-06-10 0:05 ` Vincent Mailhol
2022-06-10 1:28 ` Vincent Mailhol
2022-06-10 21:33 ` [PATCH v3 0/2] URB_FREE_COHERENT gs_usb memory leak fix Rhett Aultman
2022-06-10 21:33 ` [PATCH v3 1/2] drivers: usb/core/urb: Add URB_FREE_COHERENT Rhett Aultman
2022-06-11 15:31 ` Marc Kleine-Budde
2022-06-11 16:06 ` Vincent MAILHOL
2022-06-21 13:51 ` Greg Kroah-Hartman
2022-06-21 14:59 ` Vincent MAILHOL
2022-06-21 15:03 ` Greg Kroah-Hartman
2022-06-21 15:54 ` Vincent MAILHOL
2022-06-21 15:11 ` Alan Stern
2022-06-21 15:55 ` Vincent MAILHOL
2022-06-21 16:14 ` Alan Stern
2022-06-21 16:40 ` Vincent MAILHOL
2022-06-21 17:00 ` Greg Kroah-Hartman
2022-06-21 17:14 ` Vincent MAILHOL
2022-06-21 17:46 ` Greg Kroah-Hartman
2022-06-22 9:22 ` David Laight
2022-06-22 9:41 ` Greg Kroah-Hartman
2022-06-22 10:03 ` David Laight
2022-06-22 11:11 ` Oliver Neukum [this message]
2022-06-22 10:34 ` Vincent MAILHOL
2022-06-22 12:23 ` Greg Kroah-Hartman
2022-06-22 15:59 ` Vincent MAILHOL
2022-06-22 18:11 ` Rhett Aultman
2022-06-26 8:21 ` Vincent MAILHOL
2022-06-23 17:30 ` Hongren Zenithal Zheng
2022-06-23 17:45 ` Shuah Khan
2022-06-24 14:43 ` Alan Stern
2022-06-24 16:01 ` Hongren Zenithal Zheng
2022-06-24 16:31 ` Shuah Khan
2022-06-24 18:07 ` Alan Stern
2022-06-27 22:54 ` Shuah Khan
2022-06-28 1:35 ` Alan Stern
2022-07-01 2:10 ` Shuah Khan
2022-08-01 17:42 ` Shuah Khan
2022-08-01 18:28 ` Vincent MAILHOL
2022-08-03 23:44 ` Shuah Khan
2022-06-10 21:33 ` [PATCH v3 2/2] can: gs_usb: fix DMA memory leak on close Rhett Aultman
2022-06-11 15:35 ` Marc Kleine-Budde
2022-06-11 16:03 ` Vincent MAILHOL
2022-06-12 21:28 ` David Laight
2022-06-12 21:33 ` Marc Kleine-Budde
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