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authorJohan Hovold <jhovold@gmail.com>2011-11-06 13:06:20 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-15 13:31:03 -0500
commit14b54e39b4121f679376d4175682fe47a9a86447 (patch)
tree1ad6566f692349156b4150f6000758efed6dbb98 /drivers/usb/serial/digi_acceleport.c
parent5c85477fe6b53744709621ec14c6335e33a70992 (diff)
USB: serial: remove changelogs and old todo entries
Remove remaining changelogs from file headers (can still be retrieved through git). Remove even older changelog entries stored in Changelog.history. Remove outdated todo entries from belkin_sa. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/digi_acceleport.c')
-rw-r--r--drivers/usb/serial/digi_acceleport.c216
1 files changed, 0 insertions, 216 deletions
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index e92cbefc0f88..3786e9544ae0 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -13,222 +13,6 @@
13* 13*
14* Peter Berger (pberger@brimson.com) 14* Peter Berger (pberger@brimson.com)
15* Al Borchers (borchers@steinerpoint.com) 15* Al Borchers (borchers@steinerpoint.com)
16*
17* (12/03/2001) gkh
18* switched to using port->port.count instead of private version.
19* Removed port->active
20*
21* (04/08/2001) gb
22* Identify version on module load.
23*
24* (11/01/2000) Adam J. Richter
25* usb_device_id table support
26*
27* (11/01/2000) pberger and borchers
28* -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused
29* USB 4 ports to hang on startup.
30* -- Serialized access to write urbs by adding the dp_write_urb_in_use
31* flag; otherwise, the driver caused SMP system hangs. Watching the
32* urb status is not sufficient.
33*
34* (10/05/2000) gkh
35* -- Fixed bug with urb->dev not being set properly, now that the usb
36* core needs it.
37*
38* (8/8/2000) pberger and borchers
39* -- Fixed close so that
40* - it can timeout while waiting for transmit idle, if needed;
41* - it ignores interrupts when flushing the port, turning
42* of modem signalling, and so on;
43* - it waits for the flush to really complete before returning.
44* -- Read_bulk_callback and write_bulk_callback check for a closed
45* port before using the tty struct or writing to the port.
46* -- The two changes above fix the oops caused by interrupted closes.
47* -- Added interruptible args to write_oob_command and set_modem_signals
48* and added a timeout arg to transmit_idle; needed for fixes to
49* close.
50* -- Added code for rx_throttle and rx_unthrottle so that input flow
51* control works.
52* -- Added code to set overrun, parity, framing, and break errors
53* (untested).
54* -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length
55* bulk writes are done. These hung the Digi USB device. The
56* 0 length bulk writes were a new feature of usb-uhci added in
57* the 2.4.0-test6 kernels.
58* -- Fixed mod inc race in open; do mod inc before sleeping to wait
59* for a close to finish.
60*
61* (7/31/2000) pberger
62* -- Fixed bugs with hardware handshaking:
63* - Added code to set/clear tty->hw_stopped in digi_read_oob_callback()
64* and digi_set_termios()
65* -- Added code in digi_set_termios() to
66* - add conditional in code handling transition from B0 to only
67* set RTS if RTS/CTS flow control is either not in use or if
68* the port is not currently throttled.
69* - handle turning off CRTSCTS.
70*
71* (7/30/2000) borchers
72* -- Added support for more than one Digi USB device by moving
73* globals to a private structure in the pointed to from the
74* usb_serial structure.
75* -- Moved the modem change and transmit idle wait queues into
76* the port private structure, so each port has its own queue
77* rather than sharing global queues.
78* -- Added support for break signals.
79*
80* (7/25/2000) pberger
81* -- Added USB-2 support. Note: the USB-2 supports 3 devices: two
82* serial and a parallel port. The parallel port is implemented
83* as a serial-to-parallel converter. That is, the driver actually
84* presents all three USB-2 interfaces as serial ports, but the third
85* one physically connects to a parallel device. Thus, for example,
86* one could plug a parallel printer into the USB-2's third port,
87* but from the kernel's (and userland's) point of view what's
88* actually out there is a serial device.
89*
90* (7/15/2000) borchers
91* -- Fixed race in open when a close is in progress.
92* -- Keep count of opens and dec the module use count for each
93* outstanding open when shutdown is called (on disconnect).
94* -- Fixed sanity checks in read_bulk_callback and write_bulk_callback
95* so pointers are checked before use.
96* -- Split read bulk callback into in band and out of band
97* callbacks, and no longer restart read chains if there is
98* a status error or a sanity error. This fixed the seg
99* faults and other errors we used to get on disconnect.
100* -- Port->active is once again a flag as usb-serial intended it
101* to be, not a count. Since it was only a char it would
102* have been limited to 256 simultaneous opens. Now the open
103* count is kept in the port private structure in dp_open_count.
104* -- Added code for modularization of the digi_acceleport driver.
105*
106* (6/27/2000) pberger and borchers
107* -- Zeroed out sync field in the wakeup_task before first use;
108* otherwise the uninitialized value might prevent the task from
109* being scheduled.
110* -- Initialized ret value to 0 in write_bulk_callback, otherwise
111* the uninitialized value could cause a spurious debugging message.
112*
113* (6/22/2000) pberger and borchers
114* -- Made cond_wait_... inline--apparently on SPARC the flags arg
115* to spin_lock_irqsave cannot be passed to another function
116* to call spin_unlock_irqrestore. Thanks to Pauline Middelink.
117* -- In digi_set_modem_signals the inner nested spin locks use just
118* spin_lock() rather than spin_lock_irqsave(). The old code
119* mistakenly left interrupts off. Thanks to Pauline Middelink.
120* -- copy_from_user (which can sleep) is no longer called while a
121* spinlock is held. We copy to a local buffer before getting
122* the spinlock--don't like the extra copy but the code is simpler.
123* -- Printk and dbg are no longer called while a spin lock is held.
124*
125* (6/4/2000) pberger and borchers
126* -- Replaced separate calls to spin_unlock_irqrestore and
127* interruptible_sleep_on_timeout with a new function
128* cond_wait_interruptible_timeout_irqrestore. This eliminates
129* the race condition where the wake up could happen after
130* the unlock and before the sleep.
131* -- Close now waits for output to drain.
132* -- Open waits until any close in progress is finished.
133* -- All out of band responses are now processed, not just the
134* first in a USB packet.
135* -- Fixed a bug that prevented the driver from working when the
136* first Digi port was not the first USB serial port--the driver
137* was mistakenly using the external USB serial port number to
138* try to index into its internal ports.
139* -- Fixed an SMP bug -- write_bulk_callback is called directly from
140* an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are
141* needed for locks outside write_bulk_callback that are also
142* acquired by write_bulk_callback to prevent deadlocks.
143* -- Fixed support for select() by making digi_chars_in_buffer()
144* return 256 when -EINPROGRESS is set, as the line discipline
145* code in n_tty.c expects.
146* -- Fixed an include file ordering problem that prevented debugging
147* messages from working.
148* -- Fixed an intermittent timeout problem that caused writes to
149* sometimes get stuck on some machines on some kernels. It turns
150* out in these circumstances write_chan() (in n_tty.c) was
151* asleep waiting for our wakeup call. Even though we call
152* wake_up_interruptible() in digi_write_bulk_callback(), there is
153* a race condition that could cause the wakeup to fail: if our
154* wake_up_interruptible() call occurs between the time that our
155* driver write routine finishes and write_chan() sets current->state
156* to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state
157* to TASK_RUNNING will be lost and write_chan's subsequent call to
158* schedule() will never return (unless it catches a signal).
159* This race condition occurs because write_bulk_callback() (and thus
160* the wakeup) are called asynchronously from an interrupt, rather than
161* from the scheduler. We can avoid the race by calling the wakeup
162* from the scheduler queue and that's our fix: Now, at the end of
163* write_bulk_callback() we queue up a wakeup call on the scheduler
164* task queue. We still also invoke the wakeup directly since that
165* squeezes a bit more performance out of the driver, and any lost
166* race conditions will get cleaned up at the next scheduler run.
167*
168* NOTE: The problem also goes away if you comment out
169* the two code lines in write_chan() where current->state
170* is set to TASK_RUNNING just before calling driver.write() and to
171* TASK_INTERRUPTIBLE immediately afterwards. This is why the
172* problem did not show up with the 2.2 kernels -- they do not
173* include that code.
174*
175* (5/16/2000) pberger and borchers
176* -- Added timeouts to sleeps, to defend against lost wake ups.
177* -- Handle transition to/from B0 baud rate in digi_set_termios.
178*
179* (5/13/2000) pberger and borchers
180* -- All commands now sent on out of band port, using
181* digi_write_oob_command.
182* -- Get modem control signals whenever they change, support TIOCMGET/
183* SET/BIS/BIC ioctls.
184* -- digi_set_termios now supports parity, word size, stop bits, and
185* receive enable.
186* -- Cleaned up open and close, use digi_set_termios and
187* digi_write_oob_command to set port parameters.
188* -- Added digi_startup_device to start read chains on all ports.
189* -- Write buffer is only used when count==1, to be sure put_char can
190* write a char (unless the buffer is full).
191*
192* (5/10/2000) pberger and borchers
193* -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close.
194* -- Fixed problem where the first incoming character is lost on
195* port opens after the first close on that port. Now we keep
196* the read_urb chain open until shutdown.
197* -- Added more port conditioning calls in digi_open and digi_close.
198* -- Convert port->active to a use count so that we can deal with multiple
199* opens and closes properly.
200* -- Fixed some problems with the locking code.
201*
202* (5/3/2000) pberger and borchers
203* -- First alpha version of the driver--many known limitations and bugs.
204*
205*
206* Locking and SMP
207*
208* - Each port, including the out-of-band port, has a lock used to
209* serialize all access to the port's private structure.
210* - The port lock is also used to serialize all writes and access to
211* the port's URB.
212* - The port lock is also used for the port write_wait condition
213* variable. Holding the port lock will prevent a wake up on the
214* port's write_wait; this can be used with cond_wait_... to be sure
215* the wake up is not lost in a race when dropping the lock and
216* sleeping waiting for the wakeup.
217* - digi_write() does not sleep, since it is sometimes called on
218* interrupt time.
219* - digi_write_bulk_callback() and digi_read_bulk_callback() are
220* called directly from interrupts. Hence spin_lock_irqsave()
221* and spin_unlock_irqrestore() are used in the rest of the code
222* for any locks they acquire.
223* - digi_write_bulk_callback() gets the port lock before waking up
224* processes sleeping on the port write_wait. It also schedules
225* wake ups so they happen from the scheduler, because the tty
226* system can miss wake ups from interrupts.
227* - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to
228* recheck the condition they are sleeping on. This is defensive,
229* in case a wake up is lost.
230* - Following Documentation/DocBook/kernel-locking.tmpl no spin locks
231* are held when calling copy_to/from_user or printk.
232*/ 16*/
233 17
234#include <linux/kernel.h> 18#include <linux/kernel.h>