Hi,
Am 24.06.2012 04:25, schrieb Greg KH:
On Sat, Jun 23, 2012 at 09:19:40PM +0200, Stefan Wahren wrote:
Hello,
i'm using Linux 2.6.35 at ARM and i experience the following issue
with the mxs-auart (App UART). If i transmit and receive data over
the serial port (using mxs-auart), all the interrupt counter (RX,
TX, frame, parity, break) accessed from user space (ioctl with
TIOCGICOUNT or /proc/tty/driver/auart) are zero.
Here is the scenario to reproduce the problem:
1. echoing some characters to the uart device
2. fetch the statistics from proc-Filesystem
Expected results: transmit counter greater than zero
Observed results: transmit counter is always zero
The same szenario on the mxs-duart (Debug UART) doesn't show this problem.
Is this a bug in mxs-auart or just not implemented?
We disabled the transmit counter from being displayed a while ago for
security reasons, perhaps that is what you are seeing?
Does this security fix affect serial_core or only mxs-auart?
Prevent this security fix from reading all counter (TX, RX, frame erros,
parity errors, breaks)?
Do you mean this security issue (
https://bugzilla.redhat.com/show_bug.cgi?id=648660 ) ?
Also, you do realize just how old 2.6.35 really is, right?
Unfortunaley yes, Freescale the vendor delivers the Board Support
Package only with 2.6.35.
thanks,
greg k-h
Thanks
Stefan
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