cx25821: sanitize cx25821_openfile_audio() a bit...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/media/pci/cx25821/cx25821-audio-upstream.c b/drivers/media/pci/cx25821/cx25821-audio-upstream.c
index d930f30..d6dfb57 100644
--- a/drivers/media/pci/cx25821/cx25821-audio-upstream.c
+++ b/drivers/media/pci/cx25821/cx25821-audio-upstream.c
@@ -321,81 +321,41 @@
static int cx25821_openfile_audio(struct cx25821_dev *dev,
struct sram_channel *sram_ch)
{
- struct file *myfile;
- int i = 0, j = 0;
- int line_size = AUDIO_LINE_SIZE;
- ssize_t vfs_read_retval = 0;
- char mybuf[line_size];
- loff_t pos;
- loff_t offset = (unsigned long)0;
- mm_segment_t old_fs;
+ char *p = (void *)dev->_audiodata_buf_virt_addr;
+ struct file *file;
+ loff_t offset;
+ int i, j;
- 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 (j = 0; j < NUM_AUDIO_FRAMES; j++) {
- for (i = 0; i < dev->_audio_lines_count; i++) {
- pos = 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
- + offset / 4), mybuf,
- vfs_read_retval);
- }
-
- 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++;
-
- if (vfs_read_retval < line_size)
- break;
- }
-
- dev->_audiofile_status = (vfs_read_retval == line_size) ?
- IN_PROGRESS : END_OF_FILE;
-
- set_fs(old_fs);
- myfile->f_pos = 0;
- 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);
}
+ for (j = 0, offset = 0; j < NUM_AUDIO_FRAMES; j++) {
+ for (i = 0; i < dev->_audio_lines_count; i++) {
+ char buf[AUDIO_LINE_SIZE];
+ int n = kernel_read(file, offset, buf,
+ 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;
+ }
+
+ if (p)
+ memcpy(p + offset, buf, n);
+
+ offset += n;
+ }
+ dev->_audioframe_count++;
+ }
+ dev->_audiofile_status = IN_PROGRESS;
+ fput(file);
return 0;
}