uart_get_divisor() calculates the divisor for standard uarts, and
will eventually become a helper function for low level port drivers.

This is another step towards moving the divisor calculations into
the low level drivers, thereby allowing the faster baud rates
mentioned in the previous cset.  Moving this field to uart_port
means that the low level drivers do not have to know about the
uart_state structure.

We provide a new function, uart_get_baud_rate(), to return the
desired numeric baud rate from the uart_port and tty structures.
This allows us to:

1. localise the 38400 alternate speed kludge to one area.
2. support faster baud rates than the usual baud_base / desired_rate
   calculations in the future (eventually allowing the use of the
   magic divisors in 8250.c.)

We originally checked for failure by checking if the returned code
was non-zero.  Strictly, it should be a negative value.

Patch from Randolph Chung, slightly modified by rmk.

When displaying the details of memory mapped serial ports, we want to show
some sane base value.  The cookie returned from ioremap can be meaningless
to users (and developers), especially when the cookie could be a dynamically
allocated virtual address.

The more useful cookie is the value passed into ioremap.  We already have
support for handling this cookie internally - we haven't allowed the PCI
probe module to hand it to the higher levels until now.

Patch from Zwane Mwaikambo, fixed by rmk, comments by rmk.

SIIG cards have parallel ports in addition to serial ports.  We therefore
probe the cards in parport_serial.c and call the serial specific probe
functions in 8250_pci.c

This is the second half of a patch that was applied in 2.5.50 to
parport_serial by others without the corresponding 8250_pci.c changes.

During initialisation of 8250 serial, we scan a list of ISA ports and
register any ports.  We then perform PNPBIOS scanning, which re-registers
ttyS0.  Unfortunately, if devfs is enabled, devfs reports an error because
we try to create two tts/0 entries.

Therefore, when adding a new port we check that it has not been detected
before attempting to probe the port and register it with devfs (via the
tty layer.)

into home.transmeta.com:/home/torvalds/v2.5/linux

into kroah.com:/home/linux/linux/BK/gregkh-2.5

1-fix-lowlat:

QA found that running all four ports at 460800 would drop data. I
traced it to data being dropped in the read callback because the flip
buffers were full. Turning on the low latency flag fixed things.

2-fix-taint

A side-effect of turning on low latency; the interrupt context from
the callback is now passed through to the tty layer, passing it on to
calls back into usb-serial.c. Which causes deadlocks when trying to
re-acquire the per-port semaphore. We've already talked about this.
This patch is my work-around for the usb-serial.c brokenness.
Basically, implemement a buffering scheme, and schedule a software
interrupt to handle the data handoff to the tty layer sometime later.
urb_pool_size defaults to 8, but is a module parameter and can be
modified at runtime.
The buffering is needed so that the driver can run while data is
waiting to be processed, but I could have used the tty layer
scheduling instead of doing my own by turning off low latency.
However, I looked at the tty layer and it seems to me that there's
nothing preventing a really fast device from flipping one buffer,
flipping the next, and flipping back to the still full buffer from
before (actually, the flip just gets scheduled for later), so my
driver needs to be able to hold onto buffered data and schedule them
for processing later anyway. So, might as well leave low_latency on.


diff -Naur linux-2.5.49-0-virgin/drivers/usb/serial/whiteheat.c linux-2.5.49-1-fix-
lowlat/drivers/usb/serial/whiteheat.c

Attached is a patch that changes the 2.5.x disconnect to be similar to
2.4.x disconnect. This doesn't fix the race, but does shrink the
window such that I've never seen it trigger, even under testing
designed to do that.

There doesn't seem to be a good way to fix the race. The fix should be
to have _disconnect force any sleeping semaphore holders to run to
completion between the end of the loop in the patch below and the spot
where the underlying memory is freed, but I don't see a way to do
that.


diff -Naur linux-2.5.49-2-fix-taint/drivers/usb/serial/usb-serial.c linux-2.5.49-3-fix-drvdata/drivers/usb/serial/usb-
serial.c

This patch cleans up the vicam_decode_color function by removing
unused/useless variables and combining the two "x" loops inside the
y loop into one. It also reduces the number of times that the "x"
loop occurs from 512 to 320 which should provide a decent speed
increase. It also fixes a bug in the y loop that wrote beyond its bound.

After a little absence, here's a patch to bring the Philips Webcam driver up
to version 8.9 (skipping 8.8 which has been available as a download on my
website for a while).

This patch is against 2.5.49, and includes some of the following:
* New USB IDs for Logitech and Visionite webcams.
* Better URB link/unlink sequence when opening/closing device
  and switching resolutions.
* Adding probe for CCD/CMOS sensor type.
* Removed remnants of YUV420 palette stuff.

Also updated the description in 'Kconfig'.

Add `unlikely' to error-return path in v850 __syscall_return macro

Shrink v850 exception-trap handling code a bit

Change type of v850 function `gbus_int_disable_irqs' to void

Make v850 syscall6 macro support both old and new gcc versions

Add id for v850 `nb85e_uart' to serial_core.h

Give a compile-time error on the v850 if MAX_ORDER is too large

Make the v850 leds driver's seek routine always return a value

Update make variable used by initramfs `binary blob' creation on v850

Change the default baud rate of the `nb85e_uart' driver to 115200

Tweak some v850 name strings
[basically only affects printed output]

Random whitespace tweaks in v850 files

Add my name to CREDITS file

Update includes in v850 files to reflect recent header changes

Update v850 to use kstat_cpu in irqs.c

The v850 doesn't need sys_old_getrlimit

Add TASK_UNMAPPED_BASE for v850

Update v850 usage of do_fork to supply new args