Displaying 19 results from an estimated 19 matches for "get_current_rng".
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set_current_rng
2014 Sep 18
2
[PATCH v2 3/6] hw_random: use reference counts on each struct hwrng.
...ent_rng(void)
> +{
> + BUG_ON(!mutex_is_locked(&rng_mutex));
> + if (!current_rng)
> + return;
> +
> + kref_put(¤t_rng->ref, cleanup_rng);
> + current_rng = NULL;
> +}
> +
> +/* Returns ERR_PTR(), NULL or refcounted hwrng */
> +static struct hwrng *get_current_rng(void)
> +{
> + struct hwrng *rng;
> +
> + if (mutex_lock_interruptible(&rng_mutex))
> + return ERR_PTR(-ERESTARTSYS);
> +
> + rng = current_rng;
> + if (rng)
> + kref_get(&rng->ref);
> +
> + mutex_unlock(&rng_mutex);
> + return rng;
> +}
>...
2014 Sep 18
2
[PATCH v2 3/6] hw_random: use reference counts on each struct hwrng.
...ent_rng(void)
> +{
> + BUG_ON(!mutex_is_locked(&rng_mutex));
> + if (!current_rng)
> + return;
> +
> + kref_put(¤t_rng->ref, cleanup_rng);
> + current_rng = NULL;
> +}
> +
> +/* Returns ERR_PTR(), NULL or refcounted hwrng */
> +static struct hwrng *get_current_rng(void)
> +{
> + struct hwrng *rng;
> +
> + if (mutex_lock_interruptible(&rng_mutex))
> + return ERR_PTR(-ERESTARTSYS);
> +
> + rng = current_rng;
> + if (rng)
> + kref_get(&rng->ref);
> +
> + mutex_unlock(&rng_mutex);
> + return rng;
> +}
>...
2014 Sep 18
0
[PATCH 2/5] hw_random: use reference counts on each struct hwrng.
...;ref);
+ current_rng = rng;
+}
+
+static void drop_current_rng(void)
+{
+ BUG_ON(!mutex_is_locked(&rng_mutex));
+ if (!current_rng)
+ return;
+
+ kref_put(¤t_rng->ref, cleanup_rng);
+ current_rng = NULL;
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng(void)
+{
+ struct hwrng *rng;
+
+ if (mutex_lock_interruptible(&rng_mutex))
+ return ERR_PTR(-ERESTARTSYS);
+
+ rng = current_rng;
+ if (rng)
+ kref_get(&rng->ref);
+
+ mutex_unlock(&rng_mutex);
+ return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+ /*
+ * Hold rng_mutex...
2014 Sep 18
0
[PATCH v2 3/6] hw_random: use reference counts on each struct hwrng.
...;ref);
+ current_rng = rng;
+}
+
+static void drop_current_rng(void)
+{
+ BUG_ON(!mutex_is_locked(&rng_mutex));
+ if (!current_rng)
+ return;
+
+ kref_put(¤t_rng->ref, cleanup_rng);
+ current_rng = NULL;
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng(void)
+{
+ struct hwrng *rng;
+
+ if (mutex_lock_interruptible(&rng_mutex))
+ return ERR_PTR(-ERESTARTSYS);
+
+ rng = current_rng;
+ if (rng)
+ kref_get(&rng->ref);
+
+ mutex_unlock(&rng_mutex);
+ return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+ /*
+ * Hold rng_mutex...
2014 Oct 20
0
[PATCH v2 3/6] hw_random: use reference counts on each struct hwrng.
...;ref);
+ current_rng = rng;
+}
+
+static void drop_current_rng(void)
+{
+ BUG_ON(!mutex_is_locked(&rng_mutex));
+ if (!current_rng)
+ return;
+
+ kref_put(¤t_rng->ref, cleanup_rng);
+ current_rng = NULL;
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng(void)
+{
+ struct hwrng *rng;
+
+ if (mutex_lock_interruptible(&rng_mutex))
+ return ERR_PTR(-ERESTARTSYS);
+
+ rng = current_rng;
+ if (rng)
+ kref_get(&rng->ref);
+
+ mutex_unlock(&rng_mutex);
+ return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+ /*
+ * Hold rng_mutex...
2014 Oct 20
0
[PATCH v2 3/6] hw_random: use reference counts on each struct hwrng.
...;ref);
+ current_rng = rng;
+}
+
+static void drop_current_rng(void)
+{
+ BUG_ON(!mutex_is_locked(&rng_mutex));
+ if (!current_rng)
+ return;
+
+ kref_put(¤t_rng->ref, cleanup_rng);
+ current_rng = NULL;
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng(void)
+{
+ struct hwrng *rng;
+
+ if (mutex_lock_interruptible(&rng_mutex))
+ return ERR_PTR(-ERESTARTSYS);
+
+ rng = current_rng;
+ if (rng)
+ kref_get(&rng->ref);
+
+ mutex_unlock(&rng_mutex);
+ return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+ /*
+ * Hold rng_mutex...
2014 Nov 03
1
[PATCH v4 3/6] hw_random: use reference counts on each struct hwrng.
...urn;
+
+ /* release current_rng reference */
+ kref_put(¤t_rng->ref, cleanup_rng);
+ current_rng = NULL;
+
+ /* decrease last reference for triggering the cleanup */
+ kref_put(&rng->ref, cleanup_rng);
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng(void)
+{
+ struct hwrng *rng;
+
+ if (mutex_lock_interruptible(&rng_mutex))
+ return ERR_PTR(-ERESTARTSYS);
+
+ rng = current_rng;
+ if (rng)
+ kref_get(&rng->ref);
+
+ mutex_unlock(&rng_mutex);
+ return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+ /*
+ * Hold rng_mutex...
2014 Nov 03
1
[PATCH v4 3/6] hw_random: use reference counts on each struct hwrng.
...urn;
+
+ /* release current_rng reference */
+ kref_put(¤t_rng->ref, cleanup_rng);
+ current_rng = NULL;
+
+ /* decrease last reference for triggering the cleanup */
+ kref_put(&rng->ref, cleanup_rng);
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng(void)
+{
+ struct hwrng *rng;
+
+ if (mutex_lock_interruptible(&rng_mutex))
+ return ERR_PTR(-ERESTARTSYS);
+
+ rng = current_rng;
+ if (rng)
+ kref_get(&rng->ref);
+
+ mutex_unlock(&rng_mutex);
+ return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+ /*
+ * Hold rng_mutex...
2014 Sep 18
9
[PATCH v2 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My original was pain, Rusty posted a real fix. This patchset
fixed two issue in v1, and tested by my 6+ cases.
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
|
2014 Sep 18
9
[PATCH v2 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My original was pain, Rusty posted a real fix. This patchset
fixed two issue in v1, and tested by my 6+ cases.
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
|
2014 Dec 06
7
[PATCH v5 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My hotplug tests:
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
| guest) # dd if=/dev/random of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test
2014 Dec 06
7
[PATCH v5 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My hotplug tests:
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
| guest) # dd if=/dev/random of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test
2014 Sep 18
6
[PATCH v2 2/3] hw_random: fix stuck in catting hwrng attributes
Amos Kong <akong at redhat.com> writes:
> I started a QEMU (non-smp) guest with one virtio-rng device, and read
> random data from /dev/hwrng by dd:
>
> # dd if=/dev/hwrng of=/dev/null &
>
> In the same time, if I check hwrng attributes from sysfs by cat:
>
> # cat /sys/class/misc/hw_random/rng_*
>
> The cat process always gets stuck with slow backend (5
2014 Sep 18
6
[PATCH v2 2/3] hw_random: fix stuck in catting hwrng attributes
Amos Kong <akong at redhat.com> writes:
> I started a QEMU (non-smp) guest with one virtio-rng device, and read
> random data from /dev/hwrng by dd:
>
> # dd if=/dev/hwrng of=/dev/null &
>
> In the same time, if I check hwrng attributes from sysfs by cat:
>
> # cat /sys/class/misc/hw_random/rng_*
>
> The cat process always gets stuck with slow backend (5
2014 Sep 18
2
[PATCH 1/5] hw_random: place mutex around read functions and buffers.
There's currently a big lock around everything, and it means that we
can't query sysfs (eg /sys/devices/virtual/misc/hw_random/rng_current)
while the rng is reading. This is a real problem when the rng is slow,
or blocked (eg. virtio_rng with qemu's default /dev/random backend)
This doesn't help (it leaves the current lock untouched), just adds a
lock to protect the read function
2014 Dec 08
8
[PATCH v5 REPOST 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My hotplug tests:
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
| guest) # dd if=/dev/random of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test
2014 Dec 08
8
[PATCH v5 REPOST 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My hotplug tests:
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
| guest) # dd if=/dev/random of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test
2014 Nov 03
9
[PATCH v4 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My hotplug tests:
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
| guest) # dd if=/dev/random of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test
2014 Nov 03
9
[PATCH v4 0/6] fix hw_random stuck
When I hotunplug a busy virtio-rng device or try to access
hwrng attributes in non-smp guest, it gets stuck.
My hotplug tests:
| test 0:
| hotunplug rng device from qemu monitor
|
| test 1:
| guest) # dd if=/dev/hwrng of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test 2:
| guest) # dd if=/dev/random of=/dev/null &
| hotunplug rng device from qemu monitor
|
| test