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cx25821: sanitize cx25821_get_audio_data() a bit

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-04-13 16:35:35 -04:00
parent 05c0ae21c0
commit 2ce8fce2ea
1 changed files with 30 additions and 63 deletions
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93
drivers/media/pci/cx25821/cx25821-audio-upstream.c
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@ -259,80 +259,47 @@ void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
static int cx25821_get_audio_data(struct cx25821_dev *dev,
struct sram_channel *sram_ch)
{
struct file *myfile;
struct file *file;
int frame_index_temp = dev->_audioframe_index;
int i = 0;
int line_size = AUDIO_LINE_SIZE;
int frame_size = AUDIO_DATA_BUF_SZ;
int frame_offset = frame_size * frame_index_temp;
ssize_t vfs_read_retval = 0;
char mybuf[line_size];
char mybuf[AUDIO_LINE_SIZE];
loff_t file_offset = dev->_audioframe_count * frame_size;
loff_t pos;
mm_segment_t old_fs;
char *p = NULL;
if (dev->_audiofile_status == END_OF_FILE)
return 0;
myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
if (IS_ERR(myfile)) {
const int open_errno = -PTR_ERR(myfile);
pr_err("%s(): ERROR opening file(%s) with errno = %d!\n",
__func__, dev->_audiofilename, open_errno);
return PTR_ERR(myfile);
} else {
if (!(myfile->f_op)) {
pr_err("%s(): File has no file operations registered!\n",
__func__);
filp_close(myfile, NULL);
return -EIO;
}
if (!myfile->f_op->read) {
pr_err("%s(): File has no READ operations registered!\n",
__func__);
filp_close(myfile, NULL);
return -EIO;
}
pos = myfile->f_pos;
old_fs = get_fs();
set_fs(KERNEL_DS);
for (i = 0; i < dev->_audio_lines_count; i++) {
pos = file_offset;
vfs_read_retval = vfs_read(myfile, mybuf, line_size,
&pos);
if (vfs_read_retval > 0 && vfs_read_retval == line_size
&& dev->_audiodata_buf_virt_addr != NULL) {
memcpy((void *)(dev->_audiodata_buf_virt_addr +
frame_offset / 4), mybuf,
vfs_read_retval);
}
file_offset += vfs_read_retval;
frame_offset += vfs_read_retval;
if (vfs_read_retval < line_size) {
pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
__func__);
break;
}
}
if (i > 0)
dev->_audioframe_count++;
dev->_audiofile_status = (vfs_read_retval == line_size) ?
IN_PROGRESS : END_OF_FILE;
set_fs(old_fs);
filp_close(myfile, NULL);
file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
if (IS_ERR(file)) {
pr_err("%s(): ERROR opening file(%s) with errno = %ld!\n",
__func__, dev->_audiofilename, -PTR_ERR(file));
return PTR_ERR(file);
}
if (dev->_audiodata_buf_virt_addr)
p = (char *)dev->_audiodata_buf_virt_addr + frame_offset;
for (i = 0; i < dev->_audio_lines_count; i++) {
int n = kernel_read(file, file_offset, mybuf, AUDIO_LINE_SIZE);
if (n < AUDIO_LINE_SIZE) {
pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
__func__);
dev->_audiofile_status = END_OF_FILE;
fput(file);
return 0;
}
dev->_audiofile_status = IN_PROGRESS;
if (p) {
memcpy(p, mybuf, n);
p += n;
}
file_offset += n;
}
dev->_audioframe_count++;
fput(file);
return 0;
}