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authorCristian Birsan <cristian.birsan@microchip.com>2016-02-19 10:11:56 +0200
committerFelipe Balbi <balbi@kernel.org>2016-02-23 08:51:38 +0200
commit4c2ba0c67394514f3f75c660c9f5d02e66a7efd4 (patch)
tree5c114d1f06ba2b307cb7a86785ca761a43c272ff /drivers
parent8de4b3a3fcbc18e0aa62e9defe5c08821351be12 (diff)
downloadlinux-4c2ba0c67394514f3f75c660c9f5d02e66a7efd4.tar.bz2
usb: musb: fix DMA for host mode
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/musb/musb_host.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 79d081883628..58487a473521 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -2003,10 +2003,8 @@ 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");