Commit 4845187b authored by Jonathan Cameron's avatar Jonathan Cameron Committed by Greg Kroah-Hartman

staging: iio: ring_sw: Fix incorrect test on successful read of last value, causes infinite loop

This is a bad one. The test means that almost no reads of the last
value ever succeed!  Result is an infinite loop.

Another one for the 'oops' category.
Signed-off-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent a8947fcf
......@@ -293,7 +293,7 @@ int iio_read_last_from_sw_ring(struct iio_sw_ring_buffer *ring,
return -EAGAIN;
memcpy(data, last_written_p_copy, ring->buf.bpd);
if (unlikely(ring->last_written_p >= last_written_p_copy))
if (unlikely(ring->last_written_p != last_written_p_copy))
goto again;
iio_unmark_sw_rb_in_use(&ring->buf);
......
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