This is a note to let you know that I've just added the patch titled
Revert "hwrng: virtio - ensure reads happen after successful probe"
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-hwrng-virtio-ensure-reads-happen-after-successful-probe.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From eeec626366ffe558fc3d5685bd2b49a962acf57d Mon Sep 17 00:00:00 2001
From: Amit Shah <amit.shah@xxxxxxxxxx>
Date: Sun, 27 Jul 2014 07:35:01 +0930
Subject: Revert "hwrng: virtio - ensure reads happen after successful probe"
From: Amit Shah <amit.shah@xxxxxxxxxx>
commit eeec626366ffe558fc3d5685bd2b49a962acf57d upstream.
This reverts commit e052dbf554610e2104c5a7518c4d8374bed701bb.
Now that we use the virtio ->scan() function to register with the hwrng
core, we will not get read requests till probe is successfully finished.
So revert the workaround we had in place to refuse read requests while
we were not yet setup completely.
Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/hw_random/core.c | 6 ------
drivers/char/hw_random/virtio-rng.c | 9 ---------
2 files changed, 15 deletions(-)
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -68,12 +68,6 @@ static void add_early_randomness(struct
unsigned char bytes[16];
int bytes_read;
- /*
- * Currently only virtio-rng cannot return data during device
- * probe, and that's handled in virtio-rng.c itself. If there
- * are more such devices, this call to rng_get_data can be
- * made conditional here instead of doing it per-device.
- */
bytes_read = rng_get_data(rng, bytes, sizeof(bytes), 1);
if (bytes_read > 0)
add_device_randomness(bytes, bytes_read);
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -39,7 +39,6 @@ struct virtrng_info {
bool hwrng_register_done;
};
-static bool probe_done;
static void random_recv_done(struct virtqueue *vq)
{
@@ -70,13 +69,6 @@ static int virtio_read(struct hwrng *rng
int ret;
struct virtrng_info *vi = (struct virtrng_info *)rng->priv;
- /*
- * Don't ask host for data till we're setup. This call can
- * happen during hwrng_register(), after commit d9e7972619.
- */
- if (unlikely(!probe_done))
- return 0;
-
if (!vi->busy) {
vi->busy = true;
init_completion(&vi->have_data);
@@ -138,7 +130,6 @@ static int probe_common(struct virtio_de
return err;
}
- probe_done = true;
return 0;
}
Patches currently in stable-queue which might be from amit.shah@xxxxxxxxxx are
queue-3.16/revert-hwrng-virtio-ensure-reads-happen-after-successful-probe.patch
queue-3.16/virtio-rng-delay-hwrng_register-till-driver-is-ready.patch
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