AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-19 17:37:10 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

serial: uartps: Move the spinlock after the read of the tx empty

Browse Source 
Currently we are doing a read of the status register.
Move the spinlock after that as the reads need not be spinlock
protected. This patch prevents relaxing the cpu with spinlock held.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2019-05-24 14:41:28 +05:30 committed by Greg Kroah-Hartman
parent 1f74dfa803
commit 107475685a
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/tty/serial/xilinx_uartps.c
View File

@ -686,8 +686,6 @@ static void cdns_uart_set_termios(struct uart_port *port,
unsigned long flags;
unsigned int ctrl_reg, mode_reg;
spin_lock_irqsave(&port->lock, flags);
/* Wait for the transmit FIFO to empty before making changes */
if (!(readl(port->membase + CDNS_UART_CR) &
CDNS_UART_CR_TX_DIS)) {
@ -696,6 +694,7 @@ static void cdns_uart_set_termios(struct uart_port *port,
cpu_relax();
}
}
spin_lock_irqsave(&port->lock, flags);
/* Disable the TX and RX to set baud rate */
ctrl_reg = readl(port->membase + CDNS_UART_CR);