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 <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This patch allows ipw2100 driver to advertise the WPA-related encryption
options that it does really support. It's necessary to work correctly
with NetworkManager and other programs that actually check driver & card
capabilities.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Unify the EVENT_CARD_INSERTION and "attach" callbacks to one unified
probe() callback. As all in-kernel drivers are changed to this new
callback, there will be no temporary backwards-compatibility. Inside a
probe() function, each driver _must_ set struct pcmcia_device
*p_dev->instance and instance->handle correctly.
With these patches, the basic driver interface for 16-bit PCMCIA drivers
now has the classic four callbacks known also from other buses:
int (*probe) (struct pcmcia_device *dev);
void (*remove) (struct pcmcia_device *dev);
int (*suspend) (struct pcmcia_device *dev);
int (*resume) (struct pcmcia_device *dev);
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
The linked list of devices managed by each PCMCIA driver is, in very most
cases, unused. Therefore, remove it from many drivers.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Unify the "detach" and REMOVAL_EVENT handlers to one "remove" function.
Old functionality is preserved, for the moment.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Move the suspend and resume methods out of the event handler, and into
special functions. Also use these functions for pre- and post-reset, as
almost all drivers already do, and the remaining ones can easily be
converted.
Bugfix to include/pcmcia/ds.c
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
From: Stephen Hemminger <shemminger@osdl.org>
is_multicast_ether_addr() accepts broadcast too, so the
is_broadcast_ether_addr() calls are redundant.
Signed-off-by: David S. Miller <davem@davemloft.net>
Add ID for Symbol LA-4123. Reported by Tomas Novak <tap@post.cz>
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
orinoco_nortel was broken during conversion to iomem API. Wrong PCI BAR
is used for chipset registers. Reported by Tomas Novak <tap@post.cz>
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
There are currently two IPW_DEBUG options in drivers/net/wireless/Kconfig
(one for ipw2100 and one for ipw2200). The attached patch splits it into
IPW2100_DEBUG and IPW2200_DEBUG.
Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org>
Cc: "James P. Ketrenos" <ipw2100-admin@linux.intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
- Use kzalloc for IPW2200
- Fix config dependency for IPW2200
Signed-off-by: Panagiotis Issaris <takis@issaris.org>
Cc: James Ketrenos <jketreno@linux.intel.com>
Cc: Yi Zhu <yi.zhu@intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Hello Jeff,
this patch changes causes the airo driver to not reset the card when a
temporary WEP key is set, when the IW_ENCODE_TEMP flag is used. This is
needed for xsupplicant as 802.1x, LEAP, etc. change WEP keys frequently
after authentication and resetting the card causes infinite
reauthentication.
Javier and Jean agree with the patch, Javier suggested I send this to
you, can you apply this?
Thanks.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
without this patch after an rmmod, modprobe the card won't work anymore
until the next reboot.
This patch seem safe to apply for all cards as the bsd driver already do
that.
I had to add a timeout because strange things happen (issuecommand will
fail) if the card is already reseted (after a reboot).
PS : it seems there are missing reset when leaving monitor mode...
Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
Power management parameters could not be set by iwconfig due to
incorrect error handling.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
ipw2100: Fix 'Driver using old /proc/net/wireless...' message
Wireless extensions moved the get_wireless_stats handler from being
in net_device into wireless_handler.
A prior instance of this patch resolved the issue for the ipw2200.
This one fixes it for the ipw2100.
Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
hermas_bap_pread, hermes_bap_pwrite, and hermes_bap_pwrite_pad all have a parameter "len" that is declared unsigned,
but checked for a value less than zero. Auditing the callers, it is possible for len to be passed a negative value, so len should be an int.
Thanks to LinuxICC (http://linuxicc.sf.net)
Signed-off-by: Gabriel A. Devenyi <ace@staticwave.ca>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
In isl_38xx.c
In routine isl38xx_trigger-device
Move unnecessary udelay/register read.
This is only required when hand-compiling the driver and
setting VERBOSE > SHOW_ERROR_MESSAGES
Signed-off-by: Roger While <simrw@sim-basis.de>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This fixes a slab corruption issue in the ipw2200 driver: it essentially
multiplied the error log number _twice_ by the size of the error element
entry (once explicitly in the code, and once implicitly as part of the
regular pointer arithmetic).
Cc: Henrik Brix Andersen <brix@gentoo.org>
Cc: Bernard Blackham <bernard@blackham.com.au>
Cc: Zilvinas Valinskas <zilvinas@gemtek.lt>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
--
The function ipw_request_direct_scan() should bail out when the device
is down. This fixes a lockup caused by wpa_supplicant triggering
ipw_request_direct_scan() while the driver was in a middle of a reset
due to firmware errors.
Thanks to Zilvinas Valinskas for reporting the bug and helping me
debug it.
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
I wanted to remove the #include "hostap_ioctl.c" from hostap.c and
build hostap_ioctl.c separately, but this doesn't work since hostap.c
has the same name as the module.
After renaming hostap.c this will be possible.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Christophe Lucas <clucas@rotomalug.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Reading this driver I noticed some trailing whitespaces and tabs so I
removed them with some 80th column fitting and a few more similar
things.
Signed-off-by: Carlo Perassi <carlo@linux.it>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
* Merge PCMCIA card table with new Brodowski PCMCIA id table.
* Add missing entries to PCMCIA id table.
* Other tweaks to conform with Documentation/driver-changes.txt
(types, call request_region, etc)
* Fix size of requested IO region.
* Reduce printk verbosity.
* Remove EXPERIMENTAL
* tweak to association code - don't force shared key authentication
when wep in use.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This patch removes almost all inclusions of linux/version.h. The 3
#defines are unused in most of the touched files.
A few drivers use the simple KERNEL_VERSION(a,b,c) macro, which is
unfortunatly in linux/version.h.
There are also lots of #ifdef for long obsolete kernels, this was not
touched. In a few places, the linux/version.h include was move to where
the LINUX_VERSION_CODE was used.
quilt vi `find * -type f -name "*.[ch]"|xargs grep -El '(UTS_RELEASE|LINUX_VERSION_CODE|KERNEL_VERSION|linux/version.h)'|grep -Ev '(/(boot|coda|drm)/|~$)'`
search pattern:
/UTS_RELEASE\|LINUX_VERSION_CODE\|KERNEL_VERSION\|linux\/\(utsname\|version\).h
Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
More conversions of kmalloc/memset to kzalloc
Signed-off-by: Panagiotis Issaris <takis@issaris.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Specify the correct range when calling memset in atmel_get_range.
Do this by specifying the size of the structure, rather than the size
of the pointer.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Move update of the transmit statistics to the correct place. This
would be just before starting transmission rather than (potentially
long) afterward.
Signed-off-by: Roger While <simrw@sim-basis.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
In isl_38xx.c :
The variable "counter" is defined and incremented but never
used except if the driver is hand-compiled setting
VERBOSE > SHOW_ERROR_MESSAGES.
Move the definition and the increment to within the
#if VERBOSE .. block.
Remove extraneous udelay's.
These are not required when triggering the device.
Signed-off-by: Roger While <simrw@sim-basis.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
configured.
Countermeasures default to being turned off when wpa_supplicant runs,
regardless of if TKIP is being used. They are only turned on if a TKIP
is running. The warning we were printing is therefore not needed.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
