The VRING_AVAIL_F_NO_INTERRUPT flag is a hint that interrupts should be
suppressed. It does not guarantee that interrupts will not be raised.
Therefore, make sure to clear the interrupt after each virtio-blk read.
This avoids a stuck interrupt interfering with the OS loaded later in
the boot process.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
/* Reclaim virtqueue element */
vring_get_buf(vq, NULL);
+
+ /* Clear interrupt status register. Avoid leaving interrupts stuck if
+ * VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
+ */
+ vp_get_isr(GET_GLOBAL(vdrive_g->ioaddr));
+
return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
}
outb(status, ioaddr + VIRTIO_PCI_STATUS);
}
+static inline u8 vp_get_isr(unsigned int ioaddr)
+{
+ return inb(ioaddr + VIRTIO_PCI_ISR);
+}
static inline void vp_reset(unsigned int ioaddr)
{