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authorAl Viro <viro@zeniv.linux.org.uk>2013-07-16 17:58:45 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-09-04 06:52:46 +0400
commit5d30b4274f1f3315f48ad4b2a9a41abc94d11d16 (patch)
tree3acf57ad91649fea243704d1ffc6d370c35024dc /drivers/dma
parentbadcf2b7b816130a60152d9f5a06705176596925 (diff)
downloadlinux-5d30b4274f1f3315f48ad4b2a9a41abc94d11d16.tar.xz
coh901318: don't open-code simple_read_from_buffer()
... and BTW, failing copy_to_user() means EFAULT, not EINVAL Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/coh901318.c26
1 files changed, 5 insertions, 21 deletions
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index 9bfaddd57ef1..31011d2a26fc 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -1339,15 +1339,14 @@ static int coh901318_debugfs_read(struct file *file, char __user *buf,
{
u64 started_channels = debugfs_dma_base->pm.started_channels;
int pool_count = debugfs_dma_base->pool.debugfs_pool_counter;
- int i;
- int ret = 0;
char *dev_buf;
char *tmp;
- int dev_size;
+ int ret;
+ int i;
dev_buf = kmalloc(4*1024, GFP_KERNEL);
if (dev_buf == NULL)
- goto err_kmalloc;
+ return -ENOMEM;
tmp = dev_buf;
tmp += sprintf(tmp, "DMA -- enabled dma channels\n");
@@ -1357,26 +1356,11 @@ static int coh901318_debugfs_read(struct file *file, char __user *buf,
tmp += sprintf(tmp, "channel %d\n", i);
tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count);
- dev_size = tmp - dev_buf;
-
- /* No more to read if offset != 0 */
- if (*f_pos > dev_size)
- goto out;
- if (count > dev_size - *f_pos)
- count = dev_size - *f_pos;
-
- if (copy_to_user(buf, dev_buf + *f_pos, count))
- ret = -EINVAL;
- ret = count;
- *f_pos += count;
-
- out:
+ ret = simple_read_from_buffer(buf, count, f_pos, dev_buf,
+ tmp - dev_buf);
kfree(dev_buf);
return ret;
-
- err_kmalloc:
- return 0;
}
static const struct file_operations coh901318_debugfs_status_operations = {