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random: add interrupt callback to VMBus IRQ handler

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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.

Cc: [email protected]
Signed-off-by: Stephan Mueller <[email protected]>
Signed-off-by: Stephan Mueller <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
This commit is contained in:
Stephan Mueller 2016-05-02 02:14:34 -04:00 • committed by Theodore Ts'o
commit 4b44f2d18a
2 changed files with 4 additions and 0 deletions
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3
drivers/hv/vmbus_drv.c
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@ -42,6 +42,7 @@
#include <linux/screen_info.h>
#include <linux/kdebug.h>
#include <linux/efi.h>
#include <linux/random.h>
#include "hyperv_vmbus.h"
static struct acpi_device *hv_acpi_dev;
@ -806,6 +807,8 @@ static void vmbus_isr(void)
else
tasklet_schedule(hv_context.msg_dpc[cpu]);
}
add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
}