diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2014-05-08 20:25:56 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-20 05:03:24 +0400 |
| commit | 29d2fef8be1165a26984a94fbcf81d68c1442fc5 (patch) | |
| tree | b16a13a26c04b099add552c7edb14d71a7db5da3 /drivers/usb/core | |
| parent | 654a55d34f880bb56b3cebab53771a09a404a1f8 (diff) | |
| download | linux-29d2fef8be1165a26984a94fbcf81d68c1442fc5.tar.xz | |
usb: catch attempts to submit urbs with a vmalloc'd transfer buffer
Save someone else the debug cycles of figuring out why a driver's
transfer request is failing or causing undefined system behavior.
Buffers submitted for dma must come from GFP allocated / DMA-able
memory.
Return -EAGAIN matching the return value for dma_mapping_error() cases.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hcd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 9c4e2922b04d..adddc66c9e8d 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -1502,6 +1502,9 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, ret = -EAGAIN; else urb->transfer_flags |= URB_DMA_MAP_PAGE; + } else if (is_vmalloc_addr(urb->transfer_buffer)) { + WARN_ONCE(1, "transfer buffer not dma capable\n"); + ret = -EAGAIN; } else { urb->transfer_dma = dma_map_single( hcd->self.controller, |