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Subject[PATCH 1/2] tty: serial: imx: add lock for registers save/restore
Date
In noirq suspend/resume stage with no_console_suspend enabled,
.imx_console_write() may be called to print out log_buf
message by .printk(), so there will be race condition between
.imx_console_write() and .serial_imx_save/restore_context(),
need to add lock to protect the registers save/restore operations.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
drivers/tty/serial/imx.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 239c0fa..a09ccef 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2376,9 +2376,12 @@ static int imx_uart_remove(struct platform_device *pdev)

static void imx_uart_restore_context(struct imx_port *sport)
{
+ unsigned long flags;
+
if (!sport->context_saved)
return;

+ spin_lock_irqsave(&sport->port.lock, flags);
imx_uart_writel(sport, sport->saved_reg[4], UFCR);
imx_uart_writel(sport, sport->saved_reg[5], UESC);
imx_uart_writel(sport, sport->saved_reg[6], UTIM);
@@ -2390,11 +2393,15 @@ static void imx_uart_restore_context(struct imx_port *sport)
imx_uart_writel(sport, sport->saved_reg[2], UCR3);
imx_uart_writel(sport, sport->saved_reg[3], UCR4);
sport->context_saved = false;
+ spin_unlock_irqrestore(&sport->port.lock, flags);
}

static void imx_uart_save_context(struct imx_port *sport)
{
+ unsigned long flags;
+
/* Save necessary regs */
+ spin_lock_irqsave(&sport->port.lock, flags);
sport->saved_reg[0] = imx_uart_readl(sport, UCR1);
sport->saved_reg[1] = imx_uart_readl(sport, UCR2);
sport->saved_reg[2] = imx_uart_readl(sport, UCR3);
@@ -2406,6 +2413,7 @@ static void imx_uart_save_context(struct imx_port *sport)
sport->saved_reg[8] = imx_uart_readl(sport, UBMR);
sport->saved_reg[9] = imx_uart_readl(sport, IMX21_UTS);
sport->context_saved = true;
+ spin_unlock_irqrestore(&sport->port.lock, flags);
}

static void imx_uart_enable_wakeup(struct imx_port *sport, bool on)
--
2.7.4
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