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Message-Id: <20230814115523.15279-9-tiwai@suse.de>
Date: Mon, 14 Aug 2023 13:55:06 +0200
From: Takashi Iwai <tiwai@...e.de>
To: alsa-devel@...a-project.org
Cc: linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 08/25] ALSA: korg1212: Convert to generic PCM copy ops
This patch converts the korg1212 driver code to use the new unified
PCM copy callback. The open-coded conditional memory copies are
replaced with simpler copy_from/to_iter() calls.
Note that copy_from/to_iter() returns the copied bytes, hence the
error condition is inverted from copy_from/to_user().
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
sound/pci/korg1212/korg1212.c | 50 +++++++++--------------------------
1 file changed, 12 insertions(+), 38 deletions(-)
diff --git a/sound/pci/korg1212/korg1212.c b/sound/pci/korg1212/korg1212.c
index 33b4f95d65b3..bfbff6dee273 100644
--- a/sound/pci/korg1212/korg1212.c
+++ b/sound/pci/korg1212/korg1212.c
@@ -1285,8 +1285,7 @@ static int snd_korg1212_silence(struct snd_korg1212 *korg1212, int pos, int coun
}
static int snd_korg1212_copy_to(struct snd_pcm_substream *substream,
- void __user *dst, int pos, int count,
- bool in_kernel)
+ struct iov_iter *dst, int pos, int count)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
@@ -1306,24 +1305,20 @@ static int snd_korg1212_copy_to(struct snd_pcm_substream *substream,
#if K1212_DEBUG_LEVEL > 0
if ( (void *) src < (void *) korg1212->recordDataBufsPtr ||
(void *) src > (void *) korg1212->recordDataBufsPtr[8].bufferData ) {
- printk(KERN_DEBUG "K1212_DEBUG: snd_korg1212_copy_to KERNEL EFAULT, src=%p dst=%p iter=%d\n", src, dst, i);
+ printk(KERN_DEBUG "K1212_DEBUG: snd_korg1212_copy_to KERNEL EFAULT, src=%p dst=%p iter=%d\n", src, dst->kvec.iov_base, i);
return -EFAULT;
}
#endif
- if (in_kernel)
- memcpy((__force void *)dst, src, size);
- else if (copy_to_user(dst, src, size))
+ if (!copy_to_iter(src, size, dst))
return -EFAULT;
src++;
- dst += size;
}
return 0;
}
static int snd_korg1212_copy_from(struct snd_pcm_substream *substream,
- void __user *src, int pos, int count,
- bool in_kernel)
+ struct iov_iter *src, int pos, int count)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
@@ -1345,16 +1340,13 @@ static int snd_korg1212_copy_from(struct snd_pcm_substream *substream,
#if K1212_DEBUG_LEVEL > 0
if ( (void *) dst < (void *) korg1212->playDataBufsPtr ||
(void *) dst > (void *) korg1212->playDataBufsPtr[8].bufferData ) {
- printk(KERN_DEBUG "K1212_DEBUG: snd_korg1212_copy_from KERNEL EFAULT, src=%p dst=%p iter=%d\n", src, dst, i);
+ printk(KERN_DEBUG "K1212_DEBUG: snd_korg1212_copy_from KERNEL EFAULT, src=%p dst=%p iter=%d\n", src->kvec.iov_base, dst, i);
return -EFAULT;
}
#endif
- if (in_kernel)
- memcpy(dst, (__force void *)src, size);
- else if (copy_from_user(dst, src, size))
+ if (!copy_from_iter(dst, size, src))
return -EFAULT;
dst++;
- src += size;
}
return 0;
@@ -1642,17 +1634,9 @@ static snd_pcm_uframes_t snd_korg1212_capture_pointer(struct snd_pcm_substream *
static int snd_korg1212_playback_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
- void __user *src, unsigned long count)
+ struct iov_iter *src, unsigned long count)
{
- return snd_korg1212_copy_from(substream, src, pos, count, false);
-}
-
-static int snd_korg1212_playback_copy_kernel(struct snd_pcm_substream *substream,
- int channel, unsigned long pos,
- void *src, unsigned long count)
-{
- return snd_korg1212_copy_from(substream, (void __user *)src,
- pos, count, true);
+ return snd_korg1212_copy_from(substream, src, pos, count);
}
static int snd_korg1212_playback_silence(struct snd_pcm_substream *substream,
@@ -1670,17 +1654,9 @@ static int snd_korg1212_playback_silence(struct snd_pcm_substream *substream,
static int snd_korg1212_capture_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
- void __user *dst, unsigned long count)
+ struct iov_iter *dst, unsigned long count)
{
- return snd_korg1212_copy_to(substream, dst, pos, count, false);
-}
-
-static int snd_korg1212_capture_copy_kernel(struct snd_pcm_substream *substream,
- int channel, unsigned long pos,
- void *dst, unsigned long count)
-{
- return snd_korg1212_copy_to(substream, (void __user *)dst,
- pos, count, true);
+ return snd_korg1212_copy_to(substream, dst, pos, count);
}
static const struct snd_pcm_ops snd_korg1212_playback_ops = {
@@ -1691,8 +1667,7 @@ static const struct snd_pcm_ops snd_korg1212_playback_ops = {
.prepare = snd_korg1212_prepare,
.trigger = snd_korg1212_trigger,
.pointer = snd_korg1212_playback_pointer,
- .copy_user = snd_korg1212_playback_copy,
- .copy_kernel = snd_korg1212_playback_copy_kernel,
+ .copy = snd_korg1212_playback_copy,
.fill_silence = snd_korg1212_playback_silence,
};
@@ -1704,8 +1679,7 @@ static const struct snd_pcm_ops snd_korg1212_capture_ops = {
.prepare = snd_korg1212_prepare,
.trigger = snd_korg1212_trigger,
.pointer = snd_korg1212_capture_pointer,
- .copy_user = snd_korg1212_capture_copy,
- .copy_kernel = snd_korg1212_capture_copy_kernel,
+ .copy = snd_korg1212_capture_copy,
};
/*
--
2.35.3
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