From: Christoph Hellwig <hch@lst.de>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
Takashi Iwai <tiwai@suse.de>,
Mathias Nyman <mathias.nyman@linux.intel.com>,
airlied@linux.ie, gregkh@linuxfoundation.org,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Oliver Neukum <oneukum@suse.com>, Johan Hovold <johan@kernel.org>,
hdegoede@redhat.com, Christoph Hellwig <hch@lst.de>,
dri-devel@lists.freedesktop.org, stable@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
sean@poorly.run, christian.koenig@amd.com
Subject: Re: [PATCH v3] drm: Use USB controller's DMA mask when importing dmabufs
Date: Wed, 24 Feb 2021 08:27:22 +0100 [thread overview]
Message-ID: <20210224072722.GA32481@lst.de> (raw)
In-Reply-To: <20210223160054.GC1261797@rowland.harvard.edu>
On Tue, Feb 23, 2021 at 11:00:54AM -0500, Alan Stern wrote:
> The impression I get is that Greg would like the USB core to export a
> function which takes struct usb_interface * as argument and returns the
> appropriate DMA mask value. Then instead of messing around with USB
> internals, drm_gem_prime_import_usb could just call this new function.
>
> Adding such a utility function would be a sufficiently small change that
> it could go into the -stable kernels with no trouble.
The DMA mask value on its own is not useful. It needs to be paired with
a device that the dma API functions can be called on.
prev parent reply other threads:[~2021-02-24 7:28 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-23 10:58 [PATCH v3] drm: Use USB controller's DMA mask when importing dmabufs Thomas Zimmermann
2021-02-23 11:19 ` Greg KH
2021-02-23 11:27 ` Greg KH
2021-02-23 11:46 ` Daniel Vetter
2021-02-23 12:02 ` Greg KH
2021-02-23 12:14 ` Daniel Vetter
2021-02-23 12:24 ` Greg KH
2021-02-23 12:40 ` Daniel Vetter
2021-02-23 12:50 ` Greg KH
2021-02-23 12:59 ` Daniel Vetter
2021-02-23 12:51 ` Thomas Zimmermann
2021-02-23 13:09 ` Greg KH
2021-02-25 19:01 ` Sudip Mukherjee
2021-02-25 21:39 ` Salvatore Bonaccorso
2021-02-23 12:37 ` Thomas Zimmermann
2021-02-23 12:44 ` Greg KH
2021-02-23 12:49 ` Daniel Vetter
2021-02-23 12:52 ` Greg KH
2021-02-23 13:43 ` Thomas Zimmermann
2021-02-23 12:47 ` Daniel Vetter
2021-02-23 15:45 ` Alan Stern
2021-02-24 6:02 ` Thomas Zimmermann
2021-02-23 13:44 ` Takashi Iwai
2021-02-23 14:06 ` Thomas Zimmermann
2021-02-23 16:00 ` Alan Stern
2021-02-23 16:12 ` Takashi Iwai
2021-02-23 17:30 ` Greg KH
2021-02-24 5:59 ` Thomas Zimmermann
2021-02-24 7:27 ` Christoph Hellwig [this message]
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