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usb: musb: fix DMA for host mode

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commit 4c2ba0c67394514f3f75c660c9f5d02e66a7efd4 upstream.

Commit ac33cdb16681 ("usb: musb: Remove ifdefs for musb_host_rx in
musb_host.c part5") introduces a problem setting DMA host mode.

The musb_advance_schedule() is called immediately after receiving an
endpoint RX interrupt without waiting for the DMA transfer to complete.

As a consequence when the dma complete interrupt arrives the in_qh
member of hw_ep is already null an the musb_host_rx() exits on !urb
error case. Fix the done condition that advances the musb schedule.

Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Joshua Henderson <joshua.henderson@microchip.com>
Tested-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Adam Ford <aford173@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cristian Birsan 2016-02-19 10:11:56 +02:00 committed by Greg Kroah-Hartman
parent ff44aaa9d4
commit d174ec8385
1 changed files with 2 additions and 4 deletions
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6
drivers/usb/musb/musb_host.c
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@ -2008,10 +2008,8 @@ void musb_host_rx(struct musb *musb, u8 epnum)
qh->offset,
urb->transfer_buffer_length);
done = musb_rx_dma_in_inventra_cppi41(c, hw_ep, qh,
urb, xfer_len,
iso_err);
if (done)
if (musb_rx_dma_in_inventra_cppi41(c, hw_ep, qh, urb,
xfer_len, iso_err))
goto finish;
else
dev_err(musb->controller, "error: rx_dma failed\n");