Merge remote-tracking branch 'stable/linux-4.4.y' into rpi-4.4.y

dwc_otg: fix summarize urb->actual_length for isochronous transfers

Kernel does not copy input data of ISO transfers to userspace
if actual_length is set only in ISO transfers and not summarized
in urb->actual_length. Fixes raspberrypi#903

Merge remote-tracking branch 'stable/linux-4.4.y' into rpi-4.4.y

Merge remote-tracking branch 'stable/linux-4.4.y' into rpi-4.4.y

Merge remote-tracking branch 'stable/linux-4.4.y' into rpi-4.4.y

Merge pull request raspberrypi#1524 from DigitalDreamtimeLtd/rpi-4.4.…

…y-dma

Pull upstream dma backport into rpi 4.4.y

config: Add NF_MATCH_RPFILTER

Revert "config: Add CONFIG_DRM_LOAD_EDID_FIRMWARE"

This reverts commit 417aed4.

bcm2835-sdhost: Workaround for "slow" sectors

Some cards have been seen to cause timeouts after certain sectors are
read. This workaround enforces a minimum delay between the stop after
reading one of those sectors and a subsequent data command.

Using CMD23 (SET_BLOCK_COUNT) avoids this problem, so good cards will
not be penalised by this workaround.

Signed-off-by: Phil Elwell <[email protected]>

serial: Take care starting a hung-up tty's port

tty_port_hangup sets a port's tty field to NULL (holding the port lock),
but uart_tx_stopped, called from __uart_start (with the port lock),
uses the tty field without checking for NULL.

Change uart_tx_stopped to treat a NULL tty field as another stopped
indication.

Signed-off-by: Phil Elwell <[email protected]>