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| author |   Johan Hovold <jhovold@gmail.com> | 2012-02-06 19:22:19 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-09 08:43:02 -0800 |
| commit | e688355bfeadf17ef522b1e62cc12f8e88e69667 (patch) | |
| tree | 468e72a4b8a7694163f257abcf2e892d2bc1042c /include/linux/usb/serial.h | |
| parent | usb: Use hub port data to determine whether a port is removable (diff) | |
| download | linux-dev-e688355bfeadf17ef522b1e62cc12f8e88e69667.tar.xz linux-dev-e688355bfeadf17ef522b1e62cc12f8e88e69667.zip | |
USB: serial: add macro for console error reporting
Add macro which prints an error message only once if port is used a
console.
Reporting errors in a write path when port is used as a console could
otherwise result in an infinite loop.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb/serial.h')
| -rw-r--r-- | include/linux/usb/serial.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index 4267a9c717ba..10cb74d2ad1d 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -389,5 +389,20 @@ do { \ printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \ } while (0) +/* + * Macro for reporting errors in write path to avoid inifinite loop + * when port is used as a console. + */ +#define dev_err_console(usport, fmt, ...) \ +do { \ + static bool __print_once; \ + struct usb_serial_port *__port = (usport); \ + \ + if (!__port->port.console || !__print_once) { \ + __print_once = true; \ + dev_err(&__port->dev, fmt, ##__VA_ARGS__); \ + } \ +} while (0) + #endif /* __LINUX_USB_SERIAL_H */ |