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Date: Thu, 18 Feb 2016 09:48:25 -0800 From: Peter Hurley <peter@...leysoftware.com> To: Anand Moon <linux.amoon@...il.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.com> Cc: linux-serial@...r.kernel.org, linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] serial: samsung: fix the inconsistency in spinlock Hi Anand, On 02/18/2016 09:40 AM, Anand Moon wrote: > From: Anand Moon <linux.amoon@...il.com> > > changes fix the correct order of the spin_lock_irqrestore/save. > > Signed-off-by: Anand Moon <linux.amoon@...il.com> > --- > drivers/tty/serial/samsung.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c > index d72cd73..96fe14d 100644 > --- a/drivers/tty/serial/samsung.c > +++ b/drivers/tty/serial/samsung.c > @@ -759,9 +759,9 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) > } > > if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { > - spin_unlock(&port->lock); > + spin_unlock_irqrestore(&port->lock, flags); > uart_write_wakeup(port); > - spin_lock(&port->lock); > + spin_lock_irqsave(&port->lock, flags); This driver shouldn't be dropping the spin lock at for write wakeup. If this is causing lock-ups in a line discipline, the line discipline needs fixed. Regards, Peter Hurley > } > > if (uart_circ_empty(xmit)) >
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