If RX is disabled while there are still unprocessed bytes in RX FIFO,
cdns_uart_handle_rx() called from interrupt handler will get stuck in
the receive loop as read bytes will not get removed from the RX FIFO
and CDNS_UART_SR_RXEMPTY bit will never get set.
Avoid the stuck handler by checking first if RX is disabled. port->lock
protects against race with RX-disabling functions.
This HW behavior was mentioned by Nathan Rossi in 43e98facc4a3 ("tty:
xuartps: Fix RX hang, and TX corruption in termios call") which fixed a
similar issue in cdns_uart_set_termios().
The behavior can also be easily verified by e.g. setting
CDNS_UART_CR_RX_DIS at the beginning of cdns_uart_handle_rx() - the
following loop will then get stuck.
Resetting the FIFO using RXRST would not set RXEMPTY either so simply
issuing a reset after RX-disable would not work.
I observe this frequently on a ZynqMP board during heavy RX load at 1M
baudrate when the reader process exits and thus RX gets disabled.
Fixes: 61ec9016988f ("tty/serial: add support for Xilinx PS UART")
Signed-off-by: Anssi Hannula <anssi.hannula@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
Shubhrajyoti Datta wrote:
> Minor nit below.
> The call to the cdns_uart_handle_rx could be prevented in cdns_uart_isr
OK, changed, thanks.
Personally I liked it slightly better in handle_rx() closer to the
problematic loop (and RX being disabled here should be rare), but I'm
fine with either.
v2: Moved check from cdns_uart_handle_rx() to caller.
drivers/tty/serial/xilinx_uartps.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 094f2958cb2b..ee9f18c52d29 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -364,7 +364,13 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
cdns_uart_handle_tx(dev_id);
isrstatus &= ~CDNS_UART_IXR_TXEMPTY;
}
- if (isrstatus & CDNS_UART_IXR_RXMASK)
+
+ /*
+ * Skip RX processing if RX is disabled as RXEMPTY will never be set
+ * as read bytes will not be removed from the FIFO.
+ */
+ if (isrstatus & CDNS_UART_IXR_RXMASK &&
+ !(readl(port->membase + CDNS_UART_CR) & CDNS_UART_CR_RX_DIS))
cdns_uart_handle_rx(dev_id, isrstatus);
spin_unlock(&port->lock);
--
2.17.2
