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| author | Jorge Ramirez-Ortiz | 2019-05-20 20:38:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-05-21 12:18:16 +0200 |
| commit | 61c0e37950b88bad590056286c1d766b1f167f4e (patch) | |
| tree | 28d37b45d55dade6f8b00d85657c8662a71ecc67 /drivers/tty | |
| parent | Linux 5.2-rc1 (diff) | |
| download | kernel-qcow2-linux-61c0e37950b88bad590056286c1d766b1f167f4e.tar.gz kernel-qcow2-linux-61c0e37950b88bad590056286c1d766b1f167f4e.tar.xz kernel-qcow2-linux-61c0e37950b88bad590056286c1d766b1f167f4e.zip | |
tty: serial: msm_serial: Fix XON/XOFF
When the tty layer requests the uart to throttle, the current code
executing in msm_serial will trigger "Bad mode in Error Handler" and
generate an invalid stack frame in pstore before rebooting (that is if
pstore is indeed configured: otherwise the user shall just notice a
reboot with no further information dumped to the console).
This patch replaces the PIO byte accessor with the word accessor
already used in PIO mode.
Fixes: 68252424a7c7 ("tty: serial: msm: Support big-endian CPUs")
Cc: stable@vger.kernel.org
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/msm_serial.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index 109096033bb1..23833ad952ba 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -860,6 +860,7 @@ static void msm_handle_tx(struct uart_port *port) struct circ_buf *xmit = &msm_port->uart.state->xmit; struct msm_dma *dma = &msm_port->tx_dma; unsigned int pio_count, dma_count, dma_min; + char buf[4] = { 0 }; void __iomem *tf; int err = 0; @@ -869,10 +870,12 @@ static void msm_handle_tx(struct uart_port *port) else tf = port->membase + UART_TF; + buf[0] = port->x_char; + if (msm_port->is_uartdm) msm_reset_dm_count(port, 1); - iowrite8_rep(tf, &port->x_char, 1); + iowrite32_rep(tf, buf, 1); port->icount.tx++; port->x_char = 0; return; |