The patch titled usb,console: fix regression in usb console on kernel boot has been removed from the -mm tree. Its filename was usbconsole-fix-regression-in-usb-console-on-kernel-boot.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: usb,console: fix regression in usb console on kernel boot From: Jason Wessel <jason.wessel@xxxxxxxxxxxxx> Commit 335f8514f200e63d689113d29cb7253a5c282967 ("tty: Bring the usb tty port structure into more use") introduced a regression which stopped usb consoles from working correctly as a kernel boot console as well as interactive login device. The addition of the serial_close() which in turn calls tty_port_close_start() will change the reference count of port.count and warn about it. The usb console code had previously incremented the port.count to indicate it was making use of the device as a console and the forced change causes a double open on the usb device which leads to a non obvious kernel oops later on when the tty is freed. To fix the problem instead make use of port->console to track if the port is in fact an active console port to avoid double initialization of the usb serial device. The port.count is incremented and decremented only with in the scope of usb_console_setup() for the purpose of the low level driver initialization. Signed-off-by: Jason Wessel <jason.wessel@xxxxxxxxxxxxx> Acked-by: Alan Cox <alan@xxxxxxxxxxxxxxx> Cc: Greg KH <greg@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/usb/serial/console.c | 13 +++++++------ drivers/usb/serial/usb-serial.c | 3 ++- 2 files changed, 9 insertions(+), 7 deletions(-) diff -puN drivers/usb/serial/console.c~usbconsole-fix-regression-in-usb-console-on-kernel-boot drivers/usb/serial/console.c --- a/drivers/usb/serial/console.c~usbconsole-fix-regression-in-usb-console-on-kernel-boot +++ a/drivers/usb/serial/console.c @@ -169,9 +169,11 @@ static int usb_console_setup(struct cons kfree(tty); } } - /* So we know not to kill the hardware on a hangup on this - port. We have also bumped the use count by one so it won't go - idle */ + /* Now that any required fake tty operations are completed restore + * the tty port count */ + --port->port.count; + /* The console is special in terms of closing the device so + * indicate this port is now acting as a system console. */ port->console = 1; retval = 0; @@ -204,7 +206,7 @@ static void usb_console_write(struct con dbg("%s - port %d, %d byte(s)", __func__, port->number, count); - if (!port->port.count) { + if (!port->console) { dbg("%s - port not opened", __func__); return; } @@ -300,8 +302,7 @@ void usb_serial_console_exit(void) { if (usbcons_info.port) { unregister_console(&usbcons); - if (usbcons_info.port->port.count) - usbcons_info.port->port.count--; + usbcons_info.port->console = 0; usbcons_info.port = NULL; } } diff -puN drivers/usb/serial/usb-serial.c~usbconsole-fix-regression-in-usb-console-on-kernel-boot drivers/usb/serial/usb-serial.c --- a/drivers/usb/serial/usb-serial.c~usbconsole-fix-regression-in-usb-console-on-kernel-boot +++ a/drivers/usb/serial/usb-serial.c @@ -220,7 +220,8 @@ static int serial_open (struct tty_struc tty->driver_data = port; tty_port_tty_set(&port->port, tty); - if (port->port.count == 1) { + /* If the console is attached, the device is already open */ + if (port->port.count == 1 && !port->console) { /* lock this module before we call it * this may fail, which means we must bail out, _ Patches currently in -mm which might be from jason.wessel@xxxxxxxxxxxxx are linux-next.patch frv-duplicate-output_buffer-of-e03.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html