* [PATCH] hwrng: amd - report partial reads in non-blocking mode
@ 2026-09-23 20:12 Thorsten Blum
0 siblings, 0 replies; only message in thread
From: Thorsten Blum @ 2026-09-23 20:12 UTC (permalink / raw)
To: Olivia Mackall, Herbert Xu,
Uwe Kleine-König (The Capable Hub),
Kees Cook, Corentin LABBE
Cc: Thorsten Blum, linux-crypto, linux-kernel
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);
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