[PATCH] hwrng: amd - report partial reads in non-blocking mode

[Thorsten Blum <blum@kernel.org>]

amd_rng_read() returns 0 if no more data is available, even if some data
was already copied to the output buffer. Return the number of copied
bytes instead.

Fixes: 85962d2248fa ("hwrng: amd - Convert to new hwrng read() API")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <blum@kernel.org>
---
 drivers/char/hw_random/amd-rng.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
index 42a18fd41050..9d53f4c3e5bd 100644
--- a/drivers/char/hw_random/amd-rng.c
+++ b/drivers/char/hw_random/amd-rng.c
@@ -80,7 +80,7 @@ static int amd_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 				if (timeout-- == 0)
 					return read;
 			} else {
-				return 0;
+				return read;
 			}
 		} else {
 			*data = ioread32(priv->iobase + RNGDATA);