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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2018-03-23 14:24:16 +0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2018-03-23 14:24:16 +0300
commit43e69758e6c0cc05adc4d39316f65abb120a00a0 (patch)
tree12954805794e011dceb81a6ad898a2b0f336bc8b /drivers/media
parent70ae6a049fa9886f3d81bb35b7a806eef72351a2 (diff)
downloadlinux-43e69758e6c0cc05adc4d39316f65abb120a00a0.tar.xz
media: solo6x10: get rid of an address space warning
Instead of using an ancillary function to avoid duplicating a small portion of code that copies data either to kernelspace or between userspace-kernelspace, duplicate the code, as it prevents static analyzers to complain about it: drivers/media/pci/solo6x10/solo6x10-g723.c:260:46: warning: cast removes address space of expression The hole idea of using __user is to make sure that the code is doing the right thing with address space, so there's no sense on use casting. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/pci/solo6x10/solo6x10-g723.c39
1 files changed, 24 insertions, 15 deletions
diff --git a/drivers/media/pci/solo6x10/solo6x10-g723.c b/drivers/media/pci/solo6x10/solo6x10-g723.c
index 81be1b8df758..2ac33b5cc454 100644
--- a/drivers/media/pci/solo6x10/solo6x10-g723.c
+++ b/drivers/media/pci/solo6x10/solo6x10-g723.c
@@ -223,9 +223,9 @@ static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
return idx * G723_FRAMES_PER_PAGE;
}
-static int __snd_solo_pcm_copy(struct snd_pcm_substream *ss,
- unsigned long pos, void *dst,
- unsigned long count, bool in_kernel)
+static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
+ unsigned long pos, void __user *dst,
+ unsigned long count)
{
struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
struct solo_dev *solo_dev = solo_pcm->solo_dev;
@@ -242,10 +242,7 @@ static int __snd_solo_pcm_copy(struct snd_pcm_substream *ss,
if (err)
return err;
- if (in_kernel)
- memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
- else if (copy_to_user((void __user *)dst,
- solo_pcm->g723_buf, G723_PERIOD_BYTES))
+ if (copy_to_user(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES))
return -EFAULT;
dst += G723_PERIOD_BYTES;
}
@@ -253,18 +250,30 @@ static int __snd_solo_pcm_copy(struct snd_pcm_substream *ss,
return 0;
}
-static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
- unsigned long pos, void __user *dst,
- unsigned long count)
-{
- return __snd_solo_pcm_copy(ss, pos, (void *)dst, count, false);
-}
-
static int snd_solo_pcm_copy_kernel(struct snd_pcm_substream *ss, int channel,
unsigned long pos, void *dst,
unsigned long count)
{
- return __snd_solo_pcm_copy(ss, pos, dst, count, true);
+ struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
+ struct solo_dev *solo_dev = solo_pcm->solo_dev;
+ int err, i;
+
+ for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
+ int page = (pos / G723_FRAMES_PER_PAGE) + i;
+
+ err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
+ SOLO_G723_EXT_ADDR(solo_dev) +
+ (page * G723_PERIOD_BLOCK) +
+ (ss->number * G723_PERIOD_BYTES),
+ G723_PERIOD_BYTES, 0, 0);
+ if (err)
+ return err;
+
+ memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
+ dst += G723_PERIOD_BYTES;
+ }
+
+ return 0;
}
static const struct snd_pcm_ops snd_solo_pcm_ops = {