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 4.1-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-4.1 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-4.1/revert-serial-8250_dma-don-t-bother-dma-with-small-transfers.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html