linux-kernel - remove pci_dma_* abuses and workarounds

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Message-Id: <20180109203939.5930-1-hch@lst.de>
Date:   Tue,  9 Jan 2018 21:39:36 +0100
From:   Christoph Hellwig <hch@....de>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: remove pci_dma_* abuses and workarounds

Back before the dawn of time pci_dma_* with a NULL pci_dev argument
was used for all kinds of things, e.g. dma mapping for non-PCI
devices.  All this has been long removed, but it turns out we
still care for a NULL pci_dev in the wrappers, and we still have
two odd USB drivers that use pci_dma_alloc_consistent for allocating
memory while ignoring the dma_addr_t entirely.

This series switches the two drivers to use plain kzalloc and then
removes the handling of the NULL pci_dev in the pci_dma_* wrappers.