diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/819-uart-0007-MLK-15094-tty-serial-fsl_lpuart-check-dma_tx_in_prog.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/819-uart-0007-MLK-15094-tty-serial-fsl_lpuart-check-dma_tx_in_prog.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/819-uart-0007-MLK-15094-tty-serial-fsl_lpuart-check-dma_tx_in_prog.patch b/target/linux/layerscape/patches-5.4/819-uart-0007-MLK-15094-tty-serial-fsl_lpuart-check-dma_tx_in_prog.patch new file mode 100644 index 0000000000..58f44e86b0 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/819-uart-0007-MLK-15094-tty-serial-fsl_lpuart-check-dma_tx_in_prog.patch @@ -0,0 +1,29 @@ +From 31a4e41820cdaad9d4c151beefe5ab0698f4865a Mon Sep 17 00:00:00 2001 +From: Fugang Duan <fugang.duan@nxp.com> +Date: Thu, 15 Jun 2017 16:48:31 +0800 +Subject: [PATCH] MLK-15094 tty: serial: fsl_lpuart: check dma_tx_in_progress + in callback + +There have a corner case that tx DMA .callback() is coming after +.flush_buffer(), then .callback() should check dma_tx_in_progress +flag and return in directly. + +Signed-off-by: Fugang Duan <fugang.duan@nxp.com> +Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com> +--- + drivers/tty/serial/fsl_lpuart.c | 4 ++++ + 1 file changed, 4 insertions(+) + +--- a/drivers/tty/serial/fsl_lpuart.c ++++ b/drivers/tty/serial/fsl_lpuart.c +@@ -490,6 +490,10 @@ static void lpuart_dma_tx_complete(void + unsigned long flags; + + spin_lock_irqsave(&sport->port.lock, flags); ++ if (!sport->dma_tx_in_progress) { ++ spin_unlock_irqrestore(&sport->port.lock, flags); ++ return; ++ } + + dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); + |