All of drivers in ALSA firewire stack processes two chances to process
isochronous packets in any isochronous context; in software IRQ context
for 1394 OHCI, and in process context of ALSA PCM application.
In the process context, callbacks of .pointer and .ack are utilized. The
callbacks are done by ALSA PCM core under acquiring lock of PCM substream,
In design of ALSA PCM core, call of snd_pcm_period_elapsed() is used for
drivers to awaken user processes from waiting for available frames. The
function voluntarily acquires lock of PCM substream, therefore it is not
called in the process context since it causes dead lock.
As a workaround to avoid the dead lock, all of drivers in ALSA firewire
stack uses workqueue to delegate the call. A variant of
snd_pcm_period_elapsed() without lock acquisition can obsolete the
workqueue.
An extra care is needed for the callback of .pointer since it's called
from snd_pcm_period_elapsed(). The isochronous context in Linux FireWire
subsystem is safe mostly for nested call except in software IRQ context.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210610031733.56297-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Current implementation of ALSA PCM core has a kernel API,
snd_pcm_period_elapsed(), for drivers to queue event to awaken processes
from waiting for available frames. The function voluntarily acquires lock
of PCM substream, therefore it is not called in process context for any
PCM operation since the lock is already acquired.
It is convenient for packet-oriented driver, at least for drivers to audio
and music unit in IEEE 1394 bus. The drivers are allowed by Linux
FireWire subsystem to process isochronous packets queued till recent
isochronous cycle in process context in any time.
This commit adds snd_pcm_period_elapsed() variant,
snd_pcm_period_elapsed_without_lock(), for drivers to queue the event in
the process context.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210610031733.56297-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PARISC harmony driver code contains an assignment in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-67-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
ALSA I2C helper drivers contain a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-66-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PPC powermac driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-65-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
EMUx synth driver code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-64-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
A few ALSA serial drivers contain assignments in if condition, which
is a bad coding style that may confuse readers and occasionally lead
to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-63-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
OPL3 helper code contains a few assignments in if condition, which is
a bad coding style that may confuse readers and occasionally lead to
bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-62-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
VX driver helper code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-61-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
MPU401 driver code contains a few assignments in if condition, which
is a bad coding style that may confuse readers and occasionally lead
to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-60-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
SPARC drivers contain a few assignments in if condition, which is a
bad coding style that may confuse readers and occasionally lead to
bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-59-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCMCIA VX222 and PDAudioCF drivers contain a few assignments in if
condition, which is a bad coding style that may confuse readers and
occasionally lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-58-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
There are lots of places doing assignments in if condition in ALSA
sequencer core, which is a bad coding style that may confuse readers
and occasionally lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-57-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
There are a few places doing assignments in if condition in ALSA PCM
and OSS emulation layers, which is a bad coding style that may confuse
readers and occasionally lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-56-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
There are a few places doing assignments in if condition in ALSA PCM
core code, which is a bad coding style that may confuse readers and
occasionally lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-55-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
There are a few places doing assignments in if condition in ALSA core
code, which is a bad coding style that may confuse readers and
occasionally lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-54-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI YMFPCI driver code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-53-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI VX222 driver code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-52-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI Trident driver code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-51-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI RME9652 driver code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-50-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI HDSP driver code contains lots of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-49-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI riptide driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-48-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI PCXHR driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-47-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI NM256 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-46-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI miXart driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-45-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI Korg1212 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-44-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI ICE1712 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-43-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI EMU10k1X driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-42-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI EMU10k1 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-41-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI echoaudio drivers contain a few assignments in if condition, which
is a bad coding style that may confuse readers and occasionally lead
to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-40-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI CS5535 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-39-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI CS46xx driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-38-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI CA0106 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-37-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI AU88x0 driver code contains a lot of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes. A potential real fix is
about the PCI AGP bridge management refcount in addition while spotted
out during conversions.
Link: https://lore.kernel.org/r/20210608140540.17885-36-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
AC97 codec driver code contains a lot of assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-35-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI VIA82xx driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-34-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI sonicvibes driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-33-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI RME96 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes (only systematic
conversions except for a few rate handling codes), no functional
changes.
Link: https://lore.kernel.org/r/20210608140540.17885-32-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI RME32 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes (except for a slight
refactoring about AutoSync rate check, only systematic conversions),
no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-31-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI maestro3 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-30-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI intel8x0 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-29-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI FM801 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-28-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI ES1968 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-27-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI ES1938 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-26-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI ENS137x driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-25-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI CS4281 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-24-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
PCI CMIPCI driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.
This patch is merely for coding-style fixes, no functional changes.
Link: https://lore.kernel.org/r/20210608140540.17885-23-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
