* [PULL 1/2] vfio: ccw: remove unnecessary NULL checks of a pointer
2017-04-13 10:57 [PULL 0/2] Fixes for vfio-ccw Cornelia Huck
@ 2017-04-13 10:57 ` Cornelia Huck
2017-04-13 10:57 ` [PULL 2/2] vfio: ccw: improve error handling for vfio_ccw_mdev_remove Cornelia Huck
2017-04-24 8:53 ` [PULL 0/2] Fixes for vfio-ccw Cornelia Huck
2 siblings, 0 replies; 4+ messages in thread
From: Cornelia Huck @ 2017-04-13 10:57 UTC (permalink / raw)
To: schwidefsky; +Cc: bjsdjshi, linux-s390, kvm, Cornelia Huck
From: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Remove several unnecessary checks for the @private pointer, since it
can never be NULL in these places.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170412090816.79108-2-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
drivers/s390/cio/vfio_ccw_fsm.c | 6 +-----
drivers/s390/cio/vfio_ccw_ops.c | 17 -----------------
2 files changed, 1 insertion(+), 22 deletions(-)
diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index 55b6cc55758e..80a0559cd7ce 100644
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/drivers/s390/cio/vfio_ccw_fsm.c
@@ -161,12 +161,8 @@ static void fsm_io_request(struct vfio_ccw_private *private,
static void fsm_irq(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
- struct irb *irb;
+ struct irb *irb = this_cpu_ptr(&cio_irb);
- if (!private)
- return;
-
- irb = this_cpu_ptr(&cio_irb);
memcpy(&private->irb, irb, sizeof(*irb));
queue_work(vfio_ccw_work_q, &private->io_work);
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index b2e615404034..55d0c87e73c3 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -19,9 +19,6 @@ static int vfio_ccw_mdev_reset(struct mdev_device *mdev)
int ret;
private = dev_get_drvdata(mdev_parent_dev(mdev));
- if (!private)
- return -ENODEV;
-
sch = private->sch;
/*
* TODO:
@@ -49,9 +46,6 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
struct vfio_ccw_private *private =
container_of(nb, struct vfio_ccw_private, nb);
- if (!private)
- return NOTIFY_STOP;
-
/*
* Vendor drivers MUST unpin pages in response to an
* invalidation.
@@ -134,9 +128,6 @@ static int vfio_ccw_mdev_remove(struct mdev_device *mdev)
dev_get_drvdata(mdev_parent_dev(mdev));
int ret;
- if (!private)
- goto out;
-
if ((private->state == VFIO_CCW_STATE_NOT_OPER) ||
(private->state == VFIO_CCW_STATE_STANDBY))
goto out;
@@ -187,9 +178,6 @@ static ssize_t vfio_ccw_mdev_read(struct mdev_device *mdev,
return -EINVAL;
private = dev_get_drvdata(mdev_parent_dev(mdev));
- if (!private)
- return -ENODEV;
-
region = &private->io_region;
if (copy_to_user(buf, (void *)region + *ppos, count))
return -EFAULT;
@@ -209,8 +197,6 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev,
return -EINVAL;
private = dev_get_drvdata(mdev_parent_dev(mdev));
- if (!private)
- return -ENODEV;
if (private->state != VFIO_CCW_STATE_IDLE)
return -EACCES;
@@ -274,9 +260,6 @@ static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
return -EINVAL;
private = dev_get_drvdata(mdev_parent_dev(mdev));
- if (!private)
- return -ENODEV;
-
ctx = &private->io_trigger;
switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
--
2.11.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PULL 2/2] vfio: ccw: improve error handling for vfio_ccw_mdev_remove
2017-04-13 10:57 [PULL 0/2] Fixes for vfio-ccw Cornelia Huck
2017-04-13 10:57 ` [PULL 1/2] vfio: ccw: remove unnecessary NULL checks of a pointer Cornelia Huck
@ 2017-04-13 10:57 ` Cornelia Huck
2017-04-24 8:53 ` [PULL 0/2] Fixes for vfio-ccw Cornelia Huck
2 siblings, 0 replies; 4+ messages in thread
From: Cornelia Huck @ 2017-04-13 10:57 UTC (permalink / raw)
To: schwidefsky; +Cc: bjsdjshi, linux-s390, kvm, Cornelia Huck
From: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
When vfio_ccw_mdev_reset fails during the remove process of the mdev,
the current implementation simply returns.
The failure indicates that the subchannel device is in a NOT_OPER state,
thus the right thing to do should be removing the mdev.
While we are at here, reverse the condition check to make the code more
concise and readable.
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170412090816.79108-3-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
drivers/s390/cio/vfio_ccw_ops.c | 17 ++++++-----------
1 file changed, 6 insertions(+), 11 deletions(-)
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 55d0c87e73c3..e72abbc18ee3 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -126,19 +126,14 @@ static int vfio_ccw_mdev_remove(struct mdev_device *mdev)
{
struct vfio_ccw_private *private =
dev_get_drvdata(mdev_parent_dev(mdev));
- int ret;
-
- if ((private->state == VFIO_CCW_STATE_NOT_OPER) ||
- (private->state == VFIO_CCW_STATE_STANDBY))
- goto out;
-
- ret = vfio_ccw_mdev_reset(mdev);
- if (ret)
- return ret;
- private->state = VFIO_CCW_STATE_STANDBY;
+ if ((private->state != VFIO_CCW_STATE_NOT_OPER) &&
+ (private->state != VFIO_CCW_STATE_STANDBY)) {
+ if (!vfio_ccw_mdev_reset(mdev))
+ private->state = VFIO_CCW_STATE_STANDBY;
+ /* The state will be NOT_OPER on error. */
+ }
-out:
private->mdev = NULL;
atomic_inc(&private->avail);
--
2.11.0
^ permalink raw reply related [flat|nested] 4+ messages in thread