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authorShinya Kuribayashi <shinya.kuribayashi.px@renesas.com>2012-11-16 05:54:15 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-11-16 06:02:51 +0400
commit40f70c03e33a1eed3f3fcd13418e76abad77d117 (patch)
tree560b0e17466a4b633f51f9ab402339e5ac23e5ea /drivers/tty
parent8c66d6d2a1a572768616ddca2c3863384b14d846 (diff)
downloadlinux-40f70c03e33a1eed3f3fcd13418e76abad77d117.tar.xz
serial: sh-sci: add locking to console write function to avoid SMP lockup
Symptom: When entering the suspend with Android logcat running, printk() call gets stuck and never returns. The issue can be observed at printk()s on nonboot CPUs when going to offline with their interrupts disabled, and never seen at boot CPU (core0 in our case). Details: serial_console_write() lacks of appropriate spinlock handling. In SMP systems, as long as sci_transmit_chars() is being processed at one CPU core, serial_console_write() can stuck at the other CPU core(s), when it tries to access to the same serial port _without_ a proper locking. serial_console_write() waits for the transmit FIFO getting empty, while sci_transmit_chars() writes data to the FIFO. In general, peripheral interrupts are routed to boot CPU (core0) by Linux ARM standard affinity settings. SCI(F) interrupts are handled by core0, so sci_transmit_chars() is processed on core0 as well. When logcat is running, it writes enormous log data to the kernel at every moment, forever. So core0 can repeatedly continue to process sci_transmit_chars() in its interrupt handler, which eventually makes the other CPU core(s) stuck at serial_console_write(). Looking at serial/8250.c, this is a known console write lockup issue with SMP kernels. Fix the sh-sci driver in the same way 8250.c does. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sh-sci.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 107801b1279a..63a23eadd7e8 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2203,7 +2203,21 @@ static void serial_console_write(struct console *co, const char *s,
{
struct sci_port *sci_port = &sci_ports[co->index];
struct uart_port *port = &sci_port->port;
- unsigned short bits;
+ unsigned short bits, ctrl;
+ unsigned long flags;
+ int locked = 1;
+
+ local_irq_save(flags);
+ if (port->sysrq)
+ locked = 0;
+ else if (oops_in_progress)
+ locked = spin_trylock(&port->lock);
+ else
+ spin_lock(&port->lock);
+
+ /* first save the SCSCR then disable the interrupts */
+ ctrl = serial_port_in(port, SCSCR);
+ serial_port_out(port, SCSCR, sci_port->cfg->scscr);
uart_console_write(port, s, count, serial_console_putchar);
@@ -2211,6 +2225,13 @@ static void serial_console_write(struct console *co, const char *s,
bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
while ((serial_port_in(port, SCxSR) & bits) != bits)
cpu_relax();
+
+ /* restore the SCSCR */
+ serial_port_out(port, SCSCR, ctrl);
+
+ if (locked)
+ spin_unlock(&port->lock);
+ local_irq_restore(flags);
}
static int __devinit serial_console_setup(struct console *co, char *options)