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iio:kfifo_buf improve error handling in read_first_n.

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These two elements were originally in the patch
iio:kfifo_buf  Take advantage of the fixed record size used in IIO
but Lars-Peter Clausen pointed out they should not have been
so here they are.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Jonathan Cameron 2012-08-27 18:40:04 +01:00
parent c559afbfb0
commit 08ce9b44b5
1 changed files with 3 additions and 1 deletions
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4
drivers/iio/kfifo_buf.c
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@ -108,10 +108,12 @@ static int iio_read_first_n_kfifo(struct iio_buffer *r,
int ret, copied;
struct iio_kfifo *kf = iio_to_kfifo(r);
if (n < r->bytes_per_datum)
if (n < r->bytes_per_datum || r->bytes_per_datum == 0)
return -EINVAL;
ret = kfifo_to_user(&kf->kf, buf, n, &copied);
if (ret < 0)
return ret;
return copied;
}