From 171d9f7d786681e76bb289d01d8f897cbc50de57 Mon Sep 17 00:00:00 2001 From: John Kacur Date: Sun, 4 Jul 2010 00:02:31 +0200 Subject: [PATCH] soundcore_open: Reduce the area BKL coverage Most of this function is protected by the sound_loader_lock. We can push down the BKL to this call out err = file->f_op->open(inode,file); In order to build the sound core without the BKL, we will need to push the lock_kernel() call into the ~20 device drivers that register their file operations. Signed-off-by: John Kacur Signed-off-by: Arnd Bergmann Acked-by: Alan Cox Signed-off-by: Takashi Iwai --- sound/sound_core.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/sound/sound_core.c b/sound/sound_core.c index 7c2d677a2df5..c8627fcd4900 100644 --- a/sound/sound_core.c +++ b/sound/sound_core.c @@ -576,8 +576,6 @@ static int soundcore_open(struct inode *inode, struct file *file) struct sound_unit *s; const struct file_operations *new_fops = NULL; - lock_kernel (); - chain=unit&0x0F; if(chain==4 || chain==5) /* dsp/audio/dsp16 */ { @@ -630,18 +628,23 @@ static int soundcore_open(struct inode *inode, struct file *file) const struct file_operations *old_fops = file->f_op; file->f_op = new_fops; spin_unlock(&sound_loader_lock); - if(file->f_op->open) + + if (file->f_op->open) { + /* TODO: push down BKL into indivial open functions */ + lock_kernel(); err = file->f_op->open(inode,file); + unlock_kernel(); + } + if (err) { fops_put(file->f_op); file->f_op = fops_get(old_fops); } + fops_put(old_fops); - unlock_kernel(); return err; } spin_unlock(&sound_loader_lock); - unlock_kernel(); return -ENODEV; } -- GitLab