linux/drivers/usb/class, branch v2.6.16

[PATCH] USB: fix oops in acm disconnect

2006-02-01T01:23:37Z

this fixes an oops with disconnection in acm. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman

[PATCH] USB: cleanup of usblp

2006-02-01T01:23:37Z

this fixes -potential hang by disconnecting through usbfs -kzalloc -general cleanup -micro optimisation in interrupt handlers It compiles and I am printing. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman

[PATCH] TTY layer buffering revamp

2006-01-10T16:01:59Z

The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox Cc: Paul Fulghum Signed-off-by: Hirokazu Takata Signed-off-by: Serge Hallyn Signed-off-by: Jeff Dike Signed-off-by: John Hawkes Signed-off-by: Martin Schwidefsky Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial

2006-01-05T00:34:57Z

[PATCH] USB: Export IEEE-1284 device id in sysfs for usblp devices

2006-01-04T21:51:44Z

I looked at the userspace code which uses the LPIOC_GET_DEVICE_ID ioctl and I almost went blind. Let's export it in sysfs instead, and just as a string instead of with a big-endian length at the beginning of it. This also prints the message about finding the printer _after_ we know the minor device number it's going to have, rather than reporting all printers as 'usblp0'. Signed-off-by: David Woodhouse Signed-off-by: Greg Kroah-Hartman

[PATCH] USB: ioctl compat for usblp.c

2006-01-04T21:51:44Z

From: David Woodhouse David has a G5 with a printer. I am quite surprised that nobody else noticed this before. Linus has a G5. Hackers hate printing in general, maybe. We do not use BKL anymore, because one of code paths had a sleeping call, so we had to use a semaphore. I am sure it's safe to use unlocked_ioctl. The new ioctls return long and retval is int. It looks completely fine to me. We never want these extra bits, and the sign extension ought to work right. Signed-off-by: Pete Zaitcev Signed-off-by: Greg Kroah-Hartman --

[PATCH] USB: mark various usb tables const

2006-01-04T21:51:40Z

patch below marks various USB tables and variables as const so that they end up in .rodata section and don't cacheline share with things that get written to. For the non-array variables it also allows gcc to optimize more. Signed-off-by: Arjan van de Ven Signed-off-by: Greg Kroah-Hartman

[PATCH] USB: remove .owner field from struct usb_driver

2006-01-04T21:48:34Z

It is no longer needed, so let's remove it, saving a bit of memory. Signed-off-by: Greg Kroah-Hartman

[PATCH] USB: Converting cdc acm to a ring queue

2006-01-04T21:48:29Z

this patch by David converts the sending queue of the CDC ACM driver to a queue of URBs. This is needed for quicker devices. Please apply. Signed-Off-By: Oliver Neukum Signed-off-by: Greg Kroah-Hartman drivers/usb/class/cdc-acm.c | 229 ++++++++++++++++++++++++++++++-------------- drivers/usb/class/cdc-acm.h | 33 +++++- 2 files changed, 185 insertions(+), 77 deletions(-)

update the email address of Randy Dunlap

2006-01-03T12:37:51Z

This patch removes all references to the bouncing address rddunlap@osdl.org and one dead web page from the kernel. Signed-off-by: Adrian Bunk Acked-by: Randy Dunlap