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authorStratos Psomadakis <psomas@cslab.ece.ntua.gr>2012-01-12 09:14:47 +0400
committerRusty Russell <rusty@rustcorp.com.au>2012-01-12 09:14:47 +0400
commitb6c96c0214138186f495e3ee73737c6fc5e4efa2 (patch)
tree991ed5cd8c219543fb32f2b919556d5634859c90 /drivers/lguest/lguest_device.c
parent07fe9977b6234ede1bd29e10e0323e478860c871 (diff)
downloadlinux-b6c96c0214138186f495e3ee73737c6fc5e4efa2.tar.xz
lguest: Make sure interrupt is allocated ok by lguest_setup_irq
Make sure the interrupt is allocated correctly by lguest_setup_irq (check the return value of irq_alloc_desc_at for -ENOMEM) Signed-off-by: Stratos Psomadakis <psomas@cslab.ece.ntua.gr> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cleanups and commentry)
Diffstat (limited to 'drivers/lguest/lguest_device.c')
-rw-r--r--drivers/lguest/lguest_device.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 6a1d6447b864..9e8388efd88e 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -241,7 +241,7 @@ static void lg_notify(struct virtqueue *vq)
}
/* An extern declaration inside a C file is bad form. Don't do it. */
-extern void lguest_setup_irq(unsigned int irq);
+extern int lguest_setup_irq(unsigned int irq);
/*
* This routine finds the Nth virtqueue described in the configuration of
@@ -304,7 +304,9 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
}
/* Make sure the interrupt is allocated. */
- lguest_setup_irq(lvq->config.irq);
+ err = lguest_setup_irq(lvq->config.irq);
+ if (err)
+ goto destroy_vring;
/*
* Tell the interrupt for this virtqueue to go to the virtio_ring
@@ -317,7 +319,7 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
err = request_irq(lvq->config.irq, vring_interrupt, IRQF_SHARED,
dev_name(&vdev->dev), vq);
if (err)
- goto destroy_vring;
+ goto free_desc;
/*
* Last of all we hook up our 'struct lguest_vq_info" to the
@@ -326,6 +328,8 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
vq->priv = lvq;
return vq;
+free_desc:
+ irq_free_desc(lvq->config.irq);
destroy_vring:
vring_del_virtqueue(vq);
unmap: