diff options
| author |   Daniel Drake <dsd@laptop.org> | 2010-10-20 16:00:48 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:20:11 -0700 |
| commit | cd3ecad19aea8debae9a48b53de2ec7a571f24e9 (patch) | |
| tree | fbdb69e372b60cd01daca0c9ea3c8b5ebebb4d00 | |
| parent | serial: bfin_sport_uart: speed up sport RX sample rate to be 3% faster (diff) | |
| download | linux-dev-cd3ecad19aea8debae9a48b53de2ec7a571f24e9.tar.xz linux-dev-cd3ecad19aea8debae9a48b53de2ec7a571f24e9.zip | |
serial8250: ratelimit "too much work" error
Running a serial console, if too many kernel messages are generated within
a short time causing a lot of serial I/O, the 8250 driver will generate
another kernel message reporting this, which just adds to the I/O. It has
a cascading effect and quickly results the system being brought to its knees
by a flood of "too much work" messages.
Ratelimit the error message to avoid this.
[akpm@linux-foundation.org: use the superior printk_ratelimited()]
[akpm@linux-foundation.org: printk_ratelimited() needs ratelimit.h]
Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/serial/8250.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 37f19a678c97..167c4a6ccbc3 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -31,6 +31,7 @@ #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/tty.h> +#include <linux/ratelimit.h> #include <linux/tty_flip.h> #include <linux/serial_reg.h> #include <linux/serial_core.h> @@ -1600,8 +1601,8 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id) if (l == i->head && pass_counter++ > PASS_LIMIT) { /* If we hit this, we're dead. */ - printk(KERN_ERR "serial8250: too much work for " - "irq%d\n", irq); + printk_ratelimited(KERN_ERR + "serial8250: too much work for irq%d\n", irq); break; } } while (l != end); |