From: Mayank Rana Date: Thu, 8 Dec 2011 03:36:09 +0000 (+0530) Subject: msm_serial_hs: Fix spinlock recursion in handling CTS X-Git-Tag: firefly_0821_release~3680^2~3806^2~22 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ee815f3a76a0d874bd29635366af572fb6ebe535;p=firefly-linux-kernel-4.4.55.git msm_serial_hs: Fix spinlock recursion in handling CTS msm_hs_handle_delta_cts tries to acquire port->lock already acquired by the callee function msm_hs_isr. Change function name to follow "_locked" convention. Signed-off-by: Mayank Rana Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c index 9f67b62cb77d..5e85e1e14c44 100644 --- a/drivers/tty/serial/msm_serial_hs.c +++ b/drivers/tty/serial/msm_serial_hs.c @@ -1087,12 +1087,10 @@ static void msm_hs_config_port(struct uart_port *uport, int cfg_flags) } /* Handle CTS changes (Called from interrupt handler) */ -static void msm_hs_handle_delta_cts(struct uart_port *uport) +static void msm_hs_handle_delta_cts_locked(struct uart_port *uport) { - unsigned long flags; struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - spin_lock_irqsave(&uport->lock, flags); clk_enable(msm_uport->clk); /* clear interrupt */ @@ -1100,7 +1098,6 @@ static void msm_hs_handle_delta_cts(struct uart_port *uport) uport->icount.cts++; clk_disable(msm_uport->clk); - spin_unlock_irqrestore(&uport->lock, flags); /* clear the IOCTL TIOCMIWAIT if called */ wake_up_interruptible(&uport->state->port.delta_msr_wait); @@ -1248,7 +1245,7 @@ static irqreturn_t msm_hs_isr(int irq, void *dev) /* Change in CTS interrupt */ if (isr_status & UARTDM_ISR_DELTA_CTS_BMSK) - msm_hs_handle_delta_cts(uport); + msm_hs_handle_delta_cts_locked(uport); spin_unlock_irqrestore(&uport->lock, flags);