From: Johan Hovold Date: Tue, 7 Mar 2023 16:44:04 +0000 (+0100) Subject: serial: qcom-geni: fix mapping of empty DMA buffer X-Git-Tag: v6.6.17~5278^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=97820780b723197d1b472f2bd39fd8593b5d4edc;p=platform%2Fkernel%2Flinux-rpi.git serial: qcom-geni: fix mapping of empty DMA buffer Make sure that there is data in the ring buffer before trying to set up a zero-length DMA transfer. This specifically fixes the following warning when unmapping the empty buffer on the sc8280xp-crd: WARNING: CPU: 0 PID: 138 at drivers/iommu/dma-iommu.c:1046 iommu_dma_unmap_page+0xbc/0xd8 ... Call trace: iommu_dma_unmap_page+0xbc/0xd8 dma_unmap_page_attrs+0x30/0x1c8 geni_se_tx_dma_unprep+0x28/0x38 qcom_geni_serial_isr+0x358/0x75c Fixes: 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA") Cc: stable Cc: Bartosz Golaszewski Signed-off-by: Johan Hovold Reviewed-by: Douglas Anderson Reviewed-by: Srinivas Kandagatla Tested-by: Srinivas Kandagatla Reviewed-by: Andrew Halaney Tested-by: Andrew Halaney # sa8540p-ride Link: https://lore.kernel.org/r/20230307164405.14218-4-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 2aa3872..9871225 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -631,6 +631,9 @@ static void qcom_geni_serial_start_tx_dma(struct uart_port *uport) if (port->tx_dma_addr) return; + if (uart_circ_empty(xmit)) + return; + xmit_size = uart_circ_chars_pending(xmit); if (xmit_size < WAKEUP_CHARS) uart_write_wakeup(uport);