cxusb: Use a dma capable buffer also for reading

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commit 3f190e3aec upstream.

Commit 17ce039b4e ("[media] cxusb: don't do DMA on stack")
added a kmalloc'ed bounce buffer for writes, but missed to do the same
for reads. As the read only happens after the write is finished, we can
reuse the same buffer.

As dvb_usb_generic_rw handles a read length of 0 by itself, avoid calling
it using the dvb_usb_generic_read wrapper function.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Stefan Brüns 2017-02-05 12:57:59 -02:00 • committed by Greg Kroah-Hartman

parent 28d1e8b7ef

commit fb00319317

1 changed files with 8 additions and 7 deletions

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drivers/media/usb/dvb-usb/cxusb.c

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