There are 3 regressions in the 2.6.32 development stream for the usb
serial console.
1) A hang in the usb serial core due to a unfreed mutex
2) Crash in the usb serial core if you use a serial console
because there is a double open of the low level device
3) It is not possible to pass the console baud rate on to
the first tty open for any usb serial driver other
than the pl2303 (which has device specific baud
management).
The first open of the usb serial HW has the termios initialized to
9600 baud, and this will override what ever was setup via the original
console initialization. The solution is to save the console baud rate
and re-use it later on the first open.
This patch series only applies to the end of the Greg KH usb tree. It
was tested with a pl2303, mct_u232 and ftdi_sio usb serial devices.
Jason.
Jason Wessel (3):
usb console: fix mutex lock regression
usb console,usb-serial: fix regression use of serial->console
usb console,usb-serial: pass initial console baud on to first tty open
drivers/usb/serial/console.c | 2 ++
drivers/usb/serial/usb-serial.c | 32 +++++++++++++++++---------------
include/linux/usb/serial.h | 1 +
3 files changed, 20 insertions(+), 15 deletions(-)
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