From 0888c321de70d93f8e15614073af6c3ef56088b1 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 5 Jun 2013 14:09:55 -0400 Subject: pcm_native: switch to fdget()/fdput() Signed-off-by: Al Viro --- sound/core/pcm_native.c | 40 +++++++++++++++------------------------- 1 file changed, 15 insertions(+), 25 deletions(-) (limited to 'sound') diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index f92818155958..a68d4c6d702c 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -1589,29 +1589,16 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream) } -/* WARNING: Don't forget to fput back the file */ -static struct file *snd_pcm_file_fd(int fd, int *fput_needed) +static bool is_pcm_file(struct file *file) { - struct file *file; - struct inode *inode; + struct inode *inode = file_inode(file); unsigned int minor; - file = fget_light(fd, fput_needed); - if (!file) - return NULL; - inode = file_inode(file); - if (!S_ISCHR(inode->i_mode) || - imajor(inode) != snd_major) { - fput_light(file, *fput_needed); - return NULL; - } + if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) + return false; minor = iminor(inode); - if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && - !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { - fput_light(file, *fput_needed); - return NULL; - } - return file; + return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || + snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); } /* @@ -1620,16 +1607,18 @@ static struct file *snd_pcm_file_fd(int fd, int *fput_needed) static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) { int res = 0; - struct file *file; struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream1; struct snd_pcm_group *group; - int fput_needed; + struct fd f = fdget(fd); - file = snd_pcm_file_fd(fd, &fput_needed); - if (!file) + if (!f.file) return -EBADFD; - pcm_file = file->private_data; + if (!is_pcm_file(f.file)) { + res = -EBADFD; + goto _badf; + } + pcm_file = f.file->private_data; substream1 = pcm_file->substream; group = kmalloc(sizeof(*group), GFP_KERNEL); if (!group) { @@ -1663,8 +1652,9 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) up_write(&snd_pcm_link_rwsem); _nolock: snd_card_unref(substream1->pcm->card); - fput_light(file, fput_needed); kfree(group); + _badf: + fdput(f); return res; } -- cgit v1.2.3-70-g09d2