diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-08-16 09:24:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-21 20:03:35 +0300 |
| commit | 7b81cb6bddd2c4f2489506771070924bd0ae9902 (patch) | |
| tree | e93409bd98a306bc26cc19c1c6a29f70029d42a0 /drivers/usb/host/isp116x-hcd.c | |
| parent | 0709831a50d31b3caf2237e8d7fe89e15b0d919d (diff) | |
| download | linux-7b81cb6bddd2c4f2489506771070924bd0ae9902.tar.xz | |
usb: add a HCD_DMA flag instead of guestimating DMA capabilities
The usb core is the only major place in the kernel that checks for
a non-NULL device dma_mask to see if a device is DMA capable. This
is generally a bad idea, as all major busses always set up a DMA mask,
even if the device is not DMA capable - in fact bus layers like PCI
can't even know if a device is DMA capable at enumeration time. This
leads to lots of workaround in HCD drivers, and also prevented us from
setting up a DMA mask for platform devices by default last time we
tried.
Replace this guess with an explicit HCD_DMA that is set by drivers that
appear to have DMA support.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190816062435.881-4-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/isp116x-hcd.c')
| -rw-r--r-- | drivers/usb/host/isp116x-hcd.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c index 74da136d322a..a87c0b26279e 100644 --- a/drivers/usb/host/isp116x-hcd.c +++ b/drivers/usb/host/isp116x-hcd.c @@ -1581,12 +1581,6 @@ static int isp116x_probe(struct platform_device *pdev) irq = ires->start; irqflags = ires->flags & IRQF_TRIGGER_MASK; - if (pdev->dev.dma_mask) { - DBG("DMA not supported\n"); - ret = -EINVAL; - goto err1; - } - if (!request_mem_region(addr->start, 2, hcd_name)) { ret = -EBUSY; goto err1; |