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| author | Arnd Bergmann <arnd@arndb.de> | 2010-07-11 12:16:36 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2010-07-12 17:41:05 +0200 |
| commit | 90dc763fef4c869e60b2a7ad92e1a7dab68575ea (patch) | |
| tree | ab3757f14a6d84e36afa36ac5f325fd316d4e197 /sound/oss/swarm_cs4297a.c | |
| parent | 395c61d19621e80b763810cc988416dc1b6bfd3e (diff) | |
| download | linux-90dc763fef4c869e60b2a7ad92e1a7dab68575ea.tar.gz linux-90dc763fef4c869e60b2a7ad92e1a7dab68575ea.tar.bz2 linux-90dc763fef4c869e60b2a7ad92e1a7dab68575ea.zip | |
sound: push BKL into open functions
This moves the lock_kernel() call from soundcore_open
to the individual OSS device drivers, where we can deal
with it one driver at a time if needed, or just kill
off the drivers.
All core components in ALSA already provide
adequate locking in their open()-functions
and do not require the big kernel lock, so
there is no need to add the BKL there.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/oss/swarm_cs4297a.c')
| -rw-r--r-- | sound/oss/swarm_cs4297a.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/sound/oss/swarm_cs4297a.c b/sound/oss/swarm_cs4297a.c index 3136c88eacdf..34b0838793a6 100644 --- a/sound/oss/swarm_cs4297a.c +++ b/sound/oss/swarm_cs4297a.c @@ -68,6 +68,7 @@ #include <linux/delay.h> #include <linux/sound.h> #include <linux/slab.h> +#include <linux/smp_lock.h> #include <linux/soundcard.h> #include <linux/ac97_codec.h> #include <linux/pci.h> @@ -1534,6 +1535,7 @@ static int cs4297a_open_mixdev(struct inode *inode, struct file *file) CS_DBGOUT(CS_FUNCTION | CS_OPEN, 4, printk(KERN_INFO "cs4297a: cs4297a_open_mixdev()+\n")); + lock_kernel(); list_for_each(entry, &cs4297a_devs) { s = list_entry(entry, struct cs4297a_state, list); @@ -1544,6 +1546,8 @@ static int cs4297a_open_mixdev(struct inode *inode, struct file *file) { CS_DBGOUT(CS_FUNCTION | CS_OPEN | CS_ERROR, 2, printk(KERN_INFO "cs4297a: cs4297a_open_mixdev()- -ENODEV\n")); + + unlock_kernel(); return -ENODEV; } VALIDATE_STATE(s); @@ -1551,6 +1555,7 @@ static int cs4297a_open_mixdev(struct inode *inode, struct file *file) CS_DBGOUT(CS_FUNCTION | CS_OPEN, 4, printk(KERN_INFO "cs4297a: cs4297a_open_mixdev()- 0\n")); + unlock_kernel(); return nonseekable_open(inode, file); } @@ -2369,7 +2374,7 @@ static int cs4297a_release(struct inode *inode, struct file *file) return 0; } -static int cs4297a_open(struct inode *inode, struct file *file) +static int cs4297a_locked_open(struct inode *inode, struct file *file) { int minor = iminor(inode); struct cs4297a_state *s=NULL; @@ -2486,6 +2491,16 @@ static int cs4297a_open(struct inode *inode, struct file *file) return nonseekable_open(inode, file); } +static int cs4297a_open(struct inode *inode, struct file *file) +{ + int ret; + + lock_kernel(); + ret = cs4297a_open(inode, file); + unlock_kernel(); + + return ret; +} // ****************************************************************************************** // Wave (audio) file operations struct. |