This is a note to let you know that I've just added the patch titled
Revert "serial: 8250_dma: don't bother DMA with small transfers"
to the 4.2-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:
revert-serial-8250_dma-don-t-bother-dma-with-small-transfers.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f967fc8f165fadb72166f2bd4785094b3ca21307 Mon Sep 17 00:00:00 2001
From: Frederic Danis <frederic.danis@xxxxxxxxxxxxxxx>
Date: Fri, 9 Oct 2015 17:14:56 +0200
Subject: Revert "serial: 8250_dma: don't bother DMA with small transfers"
From: Frederic Danis <frederic.danis@xxxxxxxxxxxxxxx>
commit f967fc8f165fadb72166f2bd4785094b3ca21307 upstream.
This reverts commit 9119fba0cfeda6d415c9f068df66838a104b87cb.
This commit prevents from sending "big" file using Bluetooth.
When sending a lot of data quickly through the Bluetooth interface, and
after a variable amount of data sent, transfer fails with error:
kernel: [ 415.247453] Bluetooth: hci0 hardware error 0x00
Found on T100TA.
After reverting this commit, send works fine for any file size.
Signed-off-by: Frederic Danis <frederic.danis@xxxxxxxxxxxxxxx>
Fixes: 9119fba0cfed (serial: 8250_dma: don't bother DMA with small transfers)
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Acked-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_dma.c | 4 ----
1 file changed, 4 deletions(-)
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -80,10 +80,6 @@ int serial8250_tx_dma(struct uart_8250_p
return 0;
dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
- if (dma->tx_size < p->port.fifosize) {
- ret = -EINVAL;
- goto err;
- }
desc = dmaengine_prep_slave_single(dma->txchan,
dma->tx_addr + xmit->tail,
Patches currently in stable-queue which might be from frederic.danis@xxxxxxxxxxxxxxx are
queue-4.2/revert-serial-8250_dma-don-t-bother-dma-with-small-transfers.patch
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