usb: catch attempts to submit urbs with a vmalloc'd transfer buffer

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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>

...

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Dan Williams 2014-05-08 19:25:56 +03:00 • committed by Greg Kroah-Hartman

parent 654a55d34f

commit 29d2fef8be

1 changed files with 3 additions and 0 deletions

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drivers/usb/core/hcd.c

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