korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-20 01:24:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

msm_serial_hs: Fix spinlock recursion in handling CTS

Browse Source 
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 <mrana@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mayank Rana 2011-12-08 09:06:09 +05:30 committed by Greg Kroah-Hartman
parent 8431de80da
commit ee815f3a76
1 changed files with 2 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/tty/serial/msm_serial_hs.c
View File

@ -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);