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| author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-23 14:24:16 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-23 14:24:16 +0300 |
| commit | 43e69758e6c0cc05adc4d39316f65abb120a00a0 (patch) | |
| tree | 12954805794e011dceb81a6ad898a2b0f336bc8b /drivers/media | |
| parent | 70ae6a049fa9886f3d81bb35b7a806eef72351a2 (diff) | |
| download | linux-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.c | 39 |
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 = { |