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random: add interrupt callback to VMBus IRQ handler

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commit 4b44f2d18a330565227a7348844493c59366171e upstream.

The Hyper-V Linux Integration Services use the VMBus implementation for
communication with the Hypervisor. VMBus registers its own interrupt
handler that completely bypasses the common Linux interrupt handling.
This implies that the interrupt entropy collector is not triggered.

This patch adds the interrupt entropy collection callback into the VMBus
interrupt handler function.

Signed-off-by: Stephan Mueller <stephan.mueller@atsec.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephan Mueller 2016-05-02 02:14:34 -04:00 committed by Greg Kroah-Hartman
parent 529025b129
commit f48dd2d0a7
2 changed files with 4 additions and 0 deletions
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1
drivers/char/random.c
View File

@ -948,6 +948,7 @@ void add_interrupt_randomness(int irq, int irq_flags)
/* award one bit for the contents of the fast pool */
credit_entropy_bits(r, credit + 1);
}
EXPORT_SYMBOL_GPL(add_interrupt_randomness);
#ifdef CONFIG_BLOCK
void add_disk_randomness(struct gendisk *disk)

3
drivers/hv/vmbus_drv.c
View File

@ -41,6 +41,7 @@
#include <linux/ptrace.h>
#include <linux/screen_info.h>
#include <linux/kdebug.h>
#include <linux/random.h>
#include "hyperv_vmbus.h"
static struct acpi_device *hv_acpi_dev;
@ -826,6 +827,8 @@ static void vmbus_isr(void)
else
tasklet_schedule(&msg_dpc);
}
add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
}