Patch "tty/serial: at91: maxburst was missing for dma transfers" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

tty/serial: at91: maxburst was missing for dma transfers

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
tty-serial-at91-maxburst-was-missing-for-dma-transfers.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ludovic Desroches <[email protected]>
Date: Thu, 16 Apr 2015 16:58:12 +0200
Subject: tty/serial: at91: maxburst was missing for dma transfers

From: Ludovic Desroches <[email protected]>

commit a8d4e01637902311c5643b69a5c80e2805f04054 upstream.

Maxburst was not set when doing the dma slave configuration. This value is checked by the recently introduced xdmac. It causes an error when doing the slave configuration and so prevents from using dma.

---
 drivers/tty/serial/atmel_serial.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -880,6 +880,7 @@ static int atmel_prepare_tx_dma(struct u
 	config.direction = DMA_MEM_TO_DEV;
 	config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 	config.dst_addr = port->mapbase + ATMEL_US_THR;
+	config.dst_maxburst = 1;
 
 	ret = dmaengine_slave_config(atmel_port->chan_tx,
 				     &config);

@@ -1059,6 +1060,7 @@ static int atmel_prepare_rx_dma(struct u
 	config.direction = DMA_DEV_TO_MEM;
 	config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 	config.src_addr = port->mapbase + ATMEL_US_RHR;
+	config.src_maxburst = 1;
 
 	ret = dmaengine_slave_config(atmel_port->chan_rx,
 				     &config);

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/tty-serial-at91-maxburst-was-missing-for-dma-transfers.patch