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| author | Jiri Slaby <jirislaby@gmail.com> | 2009-06-29 18:03:34 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-06-29 18:05:52 +0200 |
| commit | 9ea5ca75a2aebb7172094a7d77acf6ff7600cc56 (patch) | |
| tree | 2fc0f2d554feaac4c23ec7c84334db30d7decbd4 /sound/oss | |
| parent | 580c9d373ce7ccfbc5227e985fca761f8f039af3 (diff) | |
| download | lwn-9ea5ca75a2aebb7172094a7d77acf6ff7600cc56.tar.gz lwn-9ea5ca75a2aebb7172094a7d77acf6ff7600cc56.zip | |
sound: OSS: mpu401, fix deadlock
mpu401_chk_version is called with a spin lock already held. Don't take it
again.
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/oss')
| -rw-r--r-- | sound/oss/mpu401.c | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/sound/oss/mpu401.c b/sound/oss/mpu401.c index 6c0a770ed054..1b2316f35b1f 100644 --- a/sound/oss/mpu401.c +++ b/sound/oss/mpu401.c @@ -926,31 +926,21 @@ static struct midi_operations mpu401_midi_operations[MAX_MIDI_DEV]; static void mpu401_chk_version(int n, struct mpu_config *devc) { int tmp; - unsigned long flags; devc->version = devc->revision = 0; - spin_lock_irqsave(&devc->lock,flags); - if ((tmp = mpu_cmd(n, 0xAC, 0)) < 0) - { - spin_unlock_irqrestore(&devc->lock,flags); + tmp = mpu_cmd(n, 0xAC, 0); + if (tmp < 0) return; - } if ((tmp & 0xf0) > 0x20) /* Why it's larger than 2.x ??? */ - { - spin_unlock_irqrestore(&devc->lock,flags); return; - } devc->version = tmp; - if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) - { + if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) { devc->version = 0; - spin_unlock_irqrestore(&devc->lock,flags); return; } devc->revision = tmp; - spin_unlock_irqrestore(&devc->lock,flags); } int attach_mpu401(struct address_info *hw_config, struct module *owner) |