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authorLinus Torvalds <torvalds@linux-foundation.org>2008-06-20 12:41:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-06-20 12:41:10 -0700
commitd5545fa0056ff2982f8a6419bd9a6ba2674deefd (patch)
treef6f4eb4b1d7a4b3b65b2ae58c993bc456facfb45 /drivers
parent77a189c28b44035ff1b6841df32c43af8a9e8399 (diff)
parent9499fe2b340d19ef55c349de794db9d917e7403f (diff)
downloadlinux-d5545fa0056ff2982f8a6419bd9a6ba2674deefd.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: ieee1394: Kconfig menu touch-up firewire: Kconfig menu touch-up firewire: deadline for PHY config transmission firewire: fw-ohci: unify printk prefixes firewire: fill_bus_reset_event needs lock protection firewire: fw-ohci: write selfIDBufferPtr before LinkControl.rcvSelfID firewire: fw-ohci: disable PHY packet reception into AR context firewire: fw-ohci: use of uninitialized data in AR handler firewire: don't panic on invalid AR request buffer
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firewire/Kconfig32
-rw-r--r--drivers/firewire/fw-cdev.c9
-rw-r--r--drivers/firewire/fw-ohci.c110
-rw-r--r--drivers/firewire/fw-transaction.c52
-rw-r--r--drivers/ieee1394/Kconfig118
5 files changed, 180 insertions, 141 deletions
diff --git a/drivers/firewire/Kconfig b/drivers/firewire/Kconfig
index fb4d391810b..76f26710fc1 100644
--- a/drivers/firewire/Kconfig
+++ b/drivers/firewire/Kconfig
@@ -1,28 +1,26 @@
-comment "An alternative FireWire stack is available with EXPERIMENTAL=y"
+comment "A new alternative FireWire stack is available with EXPERIMENTAL=y"
depends on EXPERIMENTAL=n
+comment "Enable only one of the two stacks, unless you know what you are doing"
+ depends on EXPERIMENTAL
+
config FIREWIRE
- tristate "IEEE 1394 (FireWire) support - alternative stack, EXPERIMENTAL"
+ tristate "New FireWire stack, EXPERIMENTAL"
depends on EXPERIMENTAL
select CRC_ITU_T
help
This is the "Juju" FireWire stack, a new alternative implementation
designed for robustness and simplicity. You can build either this
- stack, or the classic stack (the ieee1394 driver, ohci1394 etc.)
- or both. Please read http://wiki.linux1394.org/JujuMigration before
- you enable the new stack.
+ stack, or the old stack (the ieee1394 driver, ohci1394 etc.) or both.
+ Please read http://wiki.linux1394.org/JujuMigration before you
+ enable the new stack.
To compile this driver as a module, say M here: the module will be
called firewire-core. It functionally replaces ieee1394, raw1394,
and video1394.
- NOTE:
-
- You should only build ONE of the stacks, unless you REALLY know what
- you are doing.
-
config FIREWIRE_OHCI
- tristate "Support for OHCI FireWire host controllers"
+ tristate "OHCI-1394 controllers"
depends on PCI && FIREWIRE
help
Enable this driver if you have a FireWire controller based
@@ -33,12 +31,12 @@ config FIREWIRE_OHCI
called firewire-ohci. It replaces ohci1394 of the classic IEEE 1394
stack.
- NOTE:
+ NOTE:
- You should only build ohci1394 or firewire-ohci, but not both.
- If you nevertheless want to install both, you should configure them
- only as modules and blacklist the driver(s) which you don't want to
- have auto-loaded. Add either
+ You should only build either firewire-ohci or the old ohci1394 driver,
+ but not both. If you nevertheless want to install both, you should
+ configure them only as modules and blacklist the driver(s) which you
+ don't want to have auto-loaded. Add either
blacklist firewire-ohci
or
@@ -60,7 +58,7 @@ config FIREWIRE_OHCI_DEBUG
default y
config FIREWIRE_SBP2
- tristate "Support for storage devices (SBP-2 protocol driver)"
+ tristate "Storage devices (SBP-2 protocol)"
depends on FIREWIRE && SCSI
help
This option enables you to use SBP-2 devices connected to a
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index dda14015e87..c639915fc3c 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -205,6 +205,7 @@ fw_device_op_read(struct file *file,
return dequeue_event(client, buffer, count);
}
+/* caller must hold card->lock so that node pointers can be dereferenced here */
static void
fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
struct client *client)
@@ -214,7 +215,6 @@ fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
event->closure = client->bus_reset_closure;
event->type = FW_CDEV_EVENT_BUS_RESET;
event->generation = client->device->generation;
- smp_rmb(); /* node_id must not be older than generation */
event->node_id = client->device->node_id;
event->local_node_id = card->local_node->node_id;
event->bm_node_id = 0; /* FIXME: We don't track the BM. */
@@ -274,6 +274,7 @@ static int ioctl_get_info(struct client *client, void *buffer)
{
struct fw_cdev_get_info *get_info = buffer;
struct fw_cdev_event_bus_reset bus_reset;
+ struct fw_card *card = client->device->card;
unsigned long ret = 0;
client->version = get_info->version;
@@ -299,13 +300,17 @@ static int ioctl_get_info(struct client *client, void *buffer)
client->bus_reset_closure = get_info->bus_reset_closure;
if (get_info->bus_reset != 0) {
void __user *uptr = u64_to_uptr(get_info->bus_reset);
+ unsigned long flags;
+ spin_lock_irqsave(&card->lock, flags);
fill_bus_reset_event(&bus_reset, client);
+ spin_unlock_irqrestore(&card->lock, flags);
+
if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
return -EFAULT;
}
- get_info->card = client->device->card->index;
+ get_info->card = card->index;
return 0;
}
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 4f02c55f13e..0b66306af47 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -265,27 +265,25 @@ static void log_irqs(u32 evt)
!(evt & OHCI1394_busReset))
return;
- printk(KERN_DEBUG KBUILD_MODNAME ": IRQ "
- "%08x%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
- evt,
- evt & OHCI1394_selfIDComplete ? " selfID" : "",
- evt & OHCI1394_RQPkt ? " AR_req" : "",
- evt & OHCI1394_RSPkt ? " AR_resp" : "",
- evt & OHCI1394_reqTxComplete ? " AT_req" : "",
- evt & OHCI1394_respTxComplete ? " AT_resp" : "",
- evt & OHCI1394_isochRx ? " IR" : "",
- evt & OHCI1394_isochTx ? " IT" : "",
- evt & OHCI1394_postedWriteErr ? " postedWriteErr" : "",
- evt & OHCI1394_cycleTooLong ? " cycleTooLong" : "",
- evt & OHCI1394_cycle64Seconds ? " cycle64Seconds" : "",
- evt & OHCI1394_regAccessFail ? " regAccessFail" : "",
- evt & OHCI1394_busReset ? " busReset" : "",
- evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt |
- OHCI1394_RSPkt | OHCI1394_reqTxComplete |
- OHCI1394_respTxComplete | OHCI1394_isochRx |
- OHCI1394_isochTx | OHCI1394_postedWriteErr |
- OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds |
- OHCI1394_regAccessFail | OHCI1394_busReset)
+ fw_notify("IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt,
+ evt & OHCI1394_selfIDComplete ? " selfID" : "",
+ evt & OHCI1394_RQPkt ? " AR_req" : "",
+ evt & OHCI1394_RSPkt ? " AR_resp" : "",
+ evt & OHCI1394_reqTxComplete ? " AT_req" : "",
+ evt & OHCI1394_respTxComplete ? " AT_resp" : "",
+ evt & OHCI1394_isochRx ? " IR" : "",
+ evt & OHCI1394_isochTx ? " IT" : "",
+ evt & OHCI1394_postedWriteErr ? " postedWriteErr" : "",
+ evt & OHCI1394_cycleTooLong ? " cycleTooLong" : "",
+ evt & OHCI1394_cycle64Seconds ? " cycle64Seconds" : "",
+ evt & OHCI1394_regAccessFail ? " regAccessFail" : "",
+ evt & OHCI1394_busReset ? " busReset" : "",
+ evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt |
+ OHCI1394_RSPkt | OHCI1394_reqTxComplete |
+ OHCI1394_respTxComplete | OHCI1394_isochRx |
+ OHCI1394_isochTx | OHCI1394_postedWriteErr |
+ OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds |
+ OHCI1394_regAccessFail | OHCI1394_busReset)
? " ?" : "");
}
@@ -308,23 +306,22 @@ static void log_selfids(int node_id, int generation, int self_id_count, u32 *s)
if (likely(!(param_debug & OHCI_PARAM_DEBUG_SELFIDS)))
return;
- printk(KERN_DEBUG KBUILD_MODNAME ": %d selfIDs, generation %d, "
- "local node ID %04x\n", self_id_count, generation, node_id);
+ fw_notify("%d selfIDs, generation %d, local node ID %04x\n",
+ self_id_count, generation, node_id);
for (; self_id_count--; ++s)
if ((*s & 1 << 23) == 0)
- printk(KERN_DEBUG "selfID 0: %08x, phy %d [%c%c%c] "
- "%s gc=%d %s %s%s%s\n",
- *s, *s >> 24 & 63, _p(s, 6), _p(s, 4), _p(s, 2),
- speed[*s >> 14 & 3], *s >> 16 & 63,
- power[*s >> 8 & 7], *s >> 22 & 1 ? "L" : "",
- *s >> 11 & 1 ? "c" : "", *s & 2 ? "i" : "");
+ fw_notify("selfID 0: %08x, phy %d [%c%c%c] "
+ "%s gc=%d %s %s%s%s\n",
+ *s, *s >> 24 & 63, _p(s, 6), _p(s, 4), _p(s, 2),
+ speed[*s >> 14 & 3], *s >> 16 & 63,
+ power[*s >> 8 & 7], *s >> 22 & 1 ? "L" : "",
+ *s >> 11 & 1 ? "c" : "", *s & 2 ? "i" : "");
else
- printk(KERN_DEBUG "selfID n: %08x, phy %d "
- "[%c%c%c%c%c%c%c%c]\n",
- *s, *s >> 24 & 63,
- _p(s, 16), _p(s, 14), _p(s, 12), _p(s, 10),
- _p(s, 8), _p(s, 6), _p(s, 4), _p(s, 2));
+ fw_notify("selfID n: %08x, phy %d [%c%c%c%c%c%c%c%c]\n",
+ *s, *s >> 24 & 63,
+ _p(s, 16), _p(s, 14), _p(s, 12), _p(s, 10),
+ _p(s, 8), _p(s, 6), _p(s, 4), _p(s, 2));
}
static const char *evts[] = {
@@ -373,15 +370,14 @@ static void log_ar_at_event(char dir, int speed, u32 *header, int evt)
evt = 0x1f;
if (evt == OHCI1394_evt_bus_reset) {
- printk(KERN_DEBUG "A%c evt_bus_reset, generation %d\n",
- dir, (header[2] >> 16) & 0xff);
+ fw_notify("A%c evt_bus_reset, generation %d\n",
+ dir, (header[2] >> 16) & 0xff);
return;
}
if (header[0] == ~header[1]) {
- printk(KERN_DEBUG "A%c %s, %s, %08x\n",
- dir, evts[evt], phys[header[0] >> 30 & 0x3],
- header[0]);
+ fw_notify("A%c %s, %s, %08x\n",
+ dir, evts[evt], phys[header[0] >> 30 & 0x3], header[0]);
return;
}
@@ -400,24 +396,23 @@ static void log_ar_at_event(char dir, int speed, u32 *header, int evt)
switch (tcode) {
case 0xe: case 0xa:
- printk(KERN_DEBUG "A%c %s, %s\n",
- dir, evts[evt], tcodes[tcode]);
+ fw_notify("A%c %s, %s\n", dir, evts[evt], tcodes[tcode]);
break;
case 0x0: case 0x1: case 0x4: case 0x5: case 0x9:
- printk(KERN_DEBUG "A%c spd %x tl %02x, "
- "%04x -> %04x, %s, "
- "%s, %04x%08x%s\n",
- dir, speed, header[0] >> 10 & 0x3f,
- header[1] >> 16, header[0] >> 16, evts[evt],
- tcodes[tcode], header[1] & 0xffff, header[2], specific);
+ fw_notify("A%c spd %x tl %02x, "
+ "%04x -> %04x, %s, "
+ "%s, %04x%08x%s\n",
+ dir, speed, header[0] >> 10 & 0x3f,
+ header[1] >> 16, header[0] >> 16, evts[evt],
+ tcodes[tcode], header[1] & 0xffff, header[2], specific);
break;
default:
- printk(KERN_DEBUG "A%c spd %x tl %02x, "
- "%04x -> %04x, %s, "
- "%s%s\n",
- dir, speed, header[0] >> 10 & 0x3f,
- header[1] >> 16, header[0] >> 16, evts[evt],
- tcodes[tcode], specific);
+ fw_notify("A%c spd %x tl %02x, "
+ "%04x -> %04x, %s, "
+ "%s%s\n",
+ dir, speed, header[0] >> 10 & 0x3f,
+ header[1] >> 16, header[0] >> 16, evts[evt],
+ tcodes[tcode], specific);
}
}
@@ -548,6 +543,11 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
p.header_length = 12;
p.payload_length = 0;
break;
+
+ default:
+ /* FIXME: Stop context, discard everything, and restart? */
+ p.header_length = 0;
+ p.payload_length = 0;
}
p.payload = (void *) buffer + p.header_length;
@@ -1468,6 +1468,9 @@ static int ohci_enable(struct fw_card *card, u32 *config_rom, size_t length)
reg_write(ohci, OHCI1394_HCControlClear,
OHCI1394_HCControl_noByteSwapData);
+ reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
+ reg_write(ohci, OHCI1394_LinkControlClear,
+ OHCI1394_LinkControl_rcvPhyPkt);
reg_write(ohci, OHCI1394_LinkControlSet,
OHCI1394_LinkControl_rcvSelfID |
OHCI1394_LinkControl_cycleTimerEnable |
@@ -1481,7 +1484,6 @@ static int ohci_enable(struct fw_card *card, u32 *config_rom, size_t length)
ar_context_run(&ohci->ar_request_ctx);
ar_context_run(&ohci->ar_response_ctx);
- reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
reg_write(ohci, OHCI1394_IntEventClear, ~0);
reg_write(ohci, OHCI1394_IntMaskClear, ~0);
diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
index ccf0e4cf108..03ae8a77c47 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -20,6 +20,7 @@
#include <linux/completion.h>
#include <linux/kernel.h>
+#include <linux/kref.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -297,37 +298,55 @@ EXPORT_SYMBOL(fw_send_request);
struct fw_phy_packet {
struct fw_packet packet;
struct completion done;
+ struct kref kref;
};
-static void
-transmit_phy_packet_callback(struct fw_packet *packet,
- struct fw_card *card, int status)
+static void phy_packet_release(struct kref *kref)
+{
+ struct fw_phy_packet *p =
+ container_of(kref, struct fw_phy_packet, kref);
+ kfree(p);
+}
+
+static void transmit_phy_packet_callback(struct fw_packet *packet,
+ struct fw_card *card, int status)
{
struct fw_phy_packet *p =
container_of(packet, struct fw_phy_packet, packet);
complete(&p->done);
+ kref_put(&p->kref, phy_packet_release);
}
void fw_send_phy_config(struct fw_card *card,
int node_id, int generation, int gap_count)
{
- struct fw_phy_packet p;
+ struct fw_phy_packet *p;
+ long timeout = DIV_ROUND_UP(HZ, 10);
u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG) |
PHY_CONFIG_ROOT_ID(node_id) |
PHY_CONFIG_GAP_COUNT(gap_count);
- p.packet.header[0] = data;
- p.packet.header[1] = ~data;
- p.packet.header_length = 8;
- p.packet.payload_length = 0;
- p.packet.speed = SCODE_100;
- p.packet.generation = generation;
- p.packet.callback = transmit_phy_packet_callback;
- init_completion(&p.done);
-
- card->driver->send_request(card, &p.packet);
- wait_for_completion(&p.done);
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (p == NULL)
+ return;
+
+ p->packet.header[0] = data;
+ p->packet.header[1] = ~data;
+ p->packet.header_length = 8;
+ p->packet.payload_length = 0;
+ p->packet.speed = SCODE_100;
+ p->packet.generation = generation;
+ p->packet.callback = transmit_phy_packet_callback;
+ init_completion(&p->done);
+ kref_set(&p->kref, 2);
+
+ card->driver->send_request(card, &p->packet);
+ timeout = wait_for_completion_timeout(&p->done, timeout);
+ kref_put(&p->kref, phy_packet_release);
+
+ /* will leak p if the callback is never executed */
+ WARN_ON(timeout == 0);
}
void fw_flush_transactions(struct fw_card *card)
@@ -572,7 +591,8 @@ allocate_request(struct fw_packet *p)
break;
default:
- BUG();
+ fw_error("ERROR - corrupt request received - %08x %08x %08x\n",
+ p->header[0], p->header[1], p->header[2]);
return NULL;
}
diff --git a/drivers/ieee1394/Kconfig b/drivers/ieee1394/Kconfig
index 545663ef820..95f45f9b8e5 100644
--- a/drivers/ieee1394/Kconfig
+++ b/drivers/ieee1394/Kconfig
@@ -4,7 +4,7 @@ menu "IEEE 1394 (FireWire) support"
source "drivers/firewire/Kconfig"
config IEEE1394
- tristate "IEEE 1394 (FireWire) support"
+ tristate "Stable FireWire stack"
depends on PCI || BROKEN
help
IEEE 1394 describes a high performance serial bus, which is also
@@ -19,30 +19,45 @@ config IEEE1394
To compile this driver as a module, say M here: the
module will be called ieee1394.
-comment "Subsystem Options"
- depends on IEEE1394
-
-config IEEE1394_VERBOSEDEBUG
- bool "Excessive debugging output"
- depends on IEEE1394
+config IEEE1394_OHCI1394
+ tristate "OHCI-1394 controllers"
+ depends on PCI && IEEE1394
help
- If you say Y here, you will get very verbose debugging logs from
- the subsystem which includes a dump of the header of every sent
- and received packet. This can amount to a high amount of data
- collected in a very short time which is usually also saved to
- disk by the system logging daemons.
+ Enable this driver if you have an IEEE 1394 controller based on the
+ OHCI-1394 specification. The current driver is only tested with OHCI
+ chipsets made by Texas Instruments and NEC. Most third-party vendors
+ use one of these chipsets. It should work with any OHCI-1394
+ compliant card, however.
- Say Y if you really want or need the debugging output, everyone
- else says N.
+ To compile this driver as a module, say M here: the
+ module will be called ohci1394.
-comment "Controllers"
- depends on IEEE1394
+ NOTE:
-comment "Texas Instruments PCILynx requires I2C"
+ You should only build either ohci1394 or the new firewire-ohci driver,
+ but not both. If you nevertheless want to install both, you should
+ configure them only as modules and blacklist the driver(s) which you
+ don't want to have auto-loaded. Add either
+
+ blacklist firewire-ohci
+ or
+ blacklist ohci1394
+ blacklist video1394
+ blacklist dv1394
+
+ to /etc/modprobe.conf or /etc/modprobe.d/* and update modprobe.conf
+ depending on your distribution. The latter two modules should be
+ blacklisted together with ohci1394 because they depend on ohci1394.
+
+ If you have an old modprobe which doesn't implement the blacklist
+ directive, use "install modulename /bin/true" for the modules to be
+ blacklisted.
+
+comment "PCILynx controller requires I2C"
depends on IEEE1394 && I2C=n
config IEEE1394_PCILYNX
- tristate "Texas Instruments PCILynx support"
+ tristate "PCILynx controller"
depends on PCI && IEEE1394 && I2C
select I2C_ALGOBIT
help
@@ -57,35 +72,11 @@ config IEEE1394_PCILYNX
PowerMacs G3 B&W contain the PCILynx controller. Therefore
almost everybody can say N here.
-config IEEE1394_OHCI1394
- tristate "OHCI-1394 support"
- depends on PCI && IEEE1394
- help
- Enable this driver if you have an IEEE 1394 controller based on the
- OHCI-1394 specification. The current driver is only tested with OHCI
- chipsets made by Texas Instruments and NEC. Most third-party vendors
- use one of these chipsets. It should work with any OHCI-1394
- compliant card, however.
-
- To compile this driver as a module, say M here: the
- module will be called ohci1394.
-
-comment "Protocols"
- depends on IEEE1394
-
-config IEEE1394_VIDEO1394
- tristate "OHCI-1394 Video support"
- depends on IEEE1394 && IEEE1394_OHCI1394
- help
- This option enables video device usage for OHCI-1394 cards. Enable
- this option only if you have an IEEE 1394 video device connected to
- an OHCI-1394 card.
-
comment "SBP-2 support (for storage devices) requires SCSI"
depends on IEEE1394 && SCSI=n
config IEEE1394_SBP2
- tristate "SBP-2 support (Harddisks etc.)"
+ tristate "Storage devices (SBP-2 protocol)"
depends on IEEE1394 && SCSI
help
This option enables you to use SBP-2 devices connected to an IEEE
@@ -127,24 +118,47 @@ config IEEE1394_ETH1394
The module is called eth1394 although it does not emulate Ethernet.
+config IEEE1394_RAWIO
+ tristate "raw1394 userspace interface"
+ depends on IEEE1394
+ help
+ This option adds support for the raw1394 device file which enables
+ direct communication of user programs with IEEE 1394 devices
+ (isochronous and asynchronous). Almost all application programs
+ which access FireWire require this option.
+
+ To compile this driver as a module, say M here: the module will be
+ called raw1394.
+
+config IEEE1394_VIDEO1394
+ tristate "video1394 userspace interface"
+ depends on IEEE1394 && IEEE1394_OHCI1394
+ help
+ This option adds support for the video1394 device files which enable
+ isochronous communication of user programs with IEEE 1394 devices,
+ especially video capture or export. This interface is used by all
+ libdc1394 based programs and by several other programs, in addition to
+ the raw1394 interface. It is generally not required for DV capture.
+
+ To compile this driver as a module, say M here: the module will be
+ called video1394.
+
config IEEE1394_DV1394
- tristate "OHCI-DV I/O support (deprecated)"
+ tristate "dv1394 userspace interface (deprecated)"
depends on IEEE1394 && IEEE1394_OHCI1394
help
The dv1394 driver is unsupported and may be removed from Linux in a
future release. Its functionality is now provided by raw1394 together
with libraries such as libiec61883.
-config IEEE1394_RAWIO
- tristate "Raw IEEE1394 I/O support"
+config IEEE1394_VERBOSEDEBUG
+ bool "Excessive debugging output"
depends on IEEE1394
help
- This option adds support for the raw1394 device file which enables
- direct communication of user programs with the IEEE 1394 bus and thus
- with the attached peripherals. Almost all application programs which
- access FireWire require this option.
+ If you say Y here, you will get very verbose debugging logs from the
+ ieee1394 drivers, including sent and received packet headers. This
+ will quickly result in large amounts of data sent to the system log.
- To compile this driver as a module, say M here: the module will be
- called raw1394.
+ Say Y if you really need the debugging output. Everyone else says N.
endmenu