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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-01-05 19:36:37 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-01-07 21:08:05 -0800
commitff1cab374ad98f4b9f408525ca9c08992b4ed784 (patch)
tree2219e5bb1c37db2b612ccb7c1b86f146aeccada7 /drivers/tty
parentf658f21c65d1d8a8c93d1a6505e86c285bb7897e (diff)
downloadblackbird-op-linux-ff1cab374ad98f4b9f408525ca9c08992b4ed784.tar.gz
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serial: sh-sci: Remove cpufreq notifier to fix crash/deadlock
The BSP team noticed that there is spin/mutex lock issue on sh-sci when CPUFREQ is used. The issue is that the notifier function may call mutex_lock() while the spinlock is held, which can lead to a BUG(). This may happen if CPUFREQ is changed while another CPU calls clk_get_rate(). Taking the spinlock was added to the notifier function in commit e552de2413edad1a ("sh-sci: add platform device private data"), to protect the list of serial ports against modification during traversal. At that time the Common Clock Framework didn't exist yet, and clk_get_rate() just returned clk->rate without taking a mutex. Note that since commit d535a2305facf9b4 ("serial: sh-sci: Require a device per port mapping."), there's no longer a list of serial ports to traverse, and taking the spinlock became superfluous. To fix the issue, just remove the cpufreq notifier: 1. The notifier doesn't work correctly: all it does is update stored clock rates; it does not update the divider in the hardware. The divider will only be updated when calling sci_set_termios(). I believe this was broken back in 2004, when the old drivers/char/sh-sci.c driver (where the notifier did update the divider) was replaced by drivers/serial/sh-sci.c (where the notifier just updated port->uartclk). Cfr. full-history-linux commits 6f8deaef2e9675d9 ("[PATCH] sh: port sh-sci driver to the new API") and 3f73fe878dc9210a ("[PATCH] Remove old sh-sci driver"). 2. On modern SoCs, the sh-sci parent clock rate is no longer related to the CPU clock rate anyway, so using a cpufreq notifier is futile. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sh-sci.c42
1 files changed, 0 insertions, 42 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 5f2a03acb5d9..4646a9f531ad 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -39,7 +39,6 @@
#include <linux/major.h>
#include <linux/module.h>
#include <linux/mm.h>
-#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
@@ -124,8 +123,6 @@ struct sci_port {
struct timer_list rx_timer;
unsigned int rx_timeout;
#endif
-
- struct notifier_block freq_transition;
};
#define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
@@ -1666,32 +1663,6 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
return ret;
}
-/*
- * Here we define a transition notifier so that we can update all of our
- * ports' baud rate when the peripheral clock changes.
- */
-static int sci_notifier(struct notifier_block *self,
- unsigned long phase, void *p)
-{
- struct sci_port *sci_port;
- unsigned long flags;
- unsigned int i;
-
- sci_port = container_of(self, struct sci_port, freq_transition);
-
- if (phase == CPUFREQ_POSTCHANGE) {
- struct uart_port *port = &sci_port->port;
-
- spin_lock_irqsave(&port->lock, flags);
- for (i = 0; i < SCI_NUM_CLKS; i++)
- sci_port->clk_rates[i] =
- clk_get_rate(sci_port->clks[i]);
- spin_unlock_irqrestore(&port->lock, flags);
- }
-
- return NOTIFY_OK;
-}
-
static const struct sci_irq_desc {
const char *desc;
irq_handler_t handler;
@@ -2811,9 +2782,6 @@ static int sci_remove(struct platform_device *dev)
{
struct sci_port *port = platform_get_drvdata(dev);
- cpufreq_unregister_notifier(&port->freq_transition,
- CPUFREQ_TRANSITION_NOTIFIER);
-
uart_remove_one_port(&sci_uart_driver, &port->port);
sci_cleanup_single(port);
@@ -2965,16 +2933,6 @@ static int sci_probe(struct platform_device *dev)
if (ret)
return ret;
- sp->freq_transition.notifier_call = sci_notifier;
-
- ret = cpufreq_register_notifier(&sp->freq_transition,
- CPUFREQ_TRANSITION_NOTIFIER);
- if (unlikely(ret < 0)) {
- uart_remove_one_port(&sci_uart_driver, &sp->port);
- sci_cleanup_single(sp);
- return ret;
- }
-
#ifdef CONFIG_SH_STANDARD_BIOS
sh_bios_gdb_detach();
#endif
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