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misc: mic: Minor bug fix in 'retry' loops. 

The bug would result in incorrect 'retry' value being printed in debug
statements as well as dead code in mic_find_vqs(...) in
drivers/misc/mic/card/mic_virtio.c.

Reported-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudeep Dutt 2013-11-27 08:58:39 -08:00 коммит произвёл Greg Kroah-Hartman
Родитель bd6dc8f654
Коммит 9420b3485a
2 изменённых файлов: 10 добавлений и 10 удалений
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8
drivers/misc/mic/card/mic_virtio.c
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@ -154,14 +154,14 @@ static void mic_reset_inform_host(struct virtio_device *vdev)
{ {
struct mic_vdev *mvdev = to_micvdev(vdev); struct mic_vdev *mvdev = to_micvdev(vdev);
struct mic_device_ctrl __iomem *dc = mvdev->dc; struct mic_device_ctrl __iomem *dc = mvdev->dc;
int retry = 100, i; int retry;
iowrite8(0, &dc->host_ack); iowrite8(0, &dc->host_ack);
iowrite8(1, &dc->vdev_reset); iowrite8(1, &dc->vdev_reset);
mic_send_intr(mvdev->mdev, mvdev->c2h_vdev_db); mic_send_intr(mvdev->mdev, mvdev->c2h_vdev_db);
/* Wait till host completes all card accesses and acks the reset */ /* Wait till host completes all card accesses and acks the reset */
for (i = retry; i--;) { for (retry = 100; retry--;) {
if (ioread8(&dc->host_ack)) if (ioread8(&dc->host_ack))
break; break;
msleep(100); msleep(100);
@ -310,7 +310,7 @@ static int mic_find_vqs(struct virtio_device *vdev, unsigned nvqs,
{ {
struct mic_vdev *mvdev = to_micvdev(vdev); struct mic_vdev *mvdev = to_micvdev(vdev);
struct mic_device_ctrl __iomem *dc = mvdev->dc; struct mic_device_ctrl __iomem *dc = mvdev->dc;
int i, err, retry = 100; int i, err, retry;
/* We must have this many virtqueues. */ /* We must have this many virtqueues. */
if (nvqs > ioread8(&mvdev->desc->num_vq)) if (nvqs > ioread8(&mvdev->desc->num_vq))
@ -332,7 +332,7 @@ static int mic_find_vqs(struct virtio_device *vdev, unsigned nvqs,
* rings have been re-assigned. * rings have been re-assigned.
*/ */
mic_send_intr(mvdev->mdev, mvdev->c2h_vdev_db); mic_send_intr(mvdev->mdev, mvdev->c2h_vdev_db);
for (i = retry; i--;) { for (retry = 100; retry--;) {
if (!ioread8(&dc->used_address_updated)) if (!ioread8(&dc->used_address_updated))
break; break;
msleep(100); msleep(100);

12
drivers/misc/mic/host/mic_virtio.c
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@ -378,7 +378,7 @@ int mic_virtio_config_change(struct mic_vdev *mvdev,
void __user *argp) void __user *argp)
{ {
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
int ret = 0, retry = 100, i; int ret = 0, retry, i;
struct mic_bootparam *bootparam = mvdev->mdev->dp; struct mic_bootparam *bootparam = mvdev->mdev->dp;
s8 db = bootparam->h2c_config_db; s8 db = bootparam->h2c_config_db;
@ -401,7 +401,7 @@ int mic_virtio_config_change(struct mic_vdev *mvdev,
mvdev->dc->config_change = MIC_VIRTIO_PARAM_CONFIG_CHANGED; mvdev->dc->config_change = MIC_VIRTIO_PARAM_CONFIG_CHANGED;
mvdev->mdev->ops->send_intr(mvdev->mdev, db); mvdev->mdev->ops->send_intr(mvdev->mdev, db);
for (i = retry; i--;) { for (retry = 100; retry--;) {
ret = wait_event_timeout(wake, ret = wait_event_timeout(wake,
mvdev->dc->guest_ack, msecs_to_jiffies(100)); mvdev->dc->guest_ack, msecs_to_jiffies(100));
if (ret) if (ret)
@ -639,7 +639,7 @@ void mic_virtio_del_device(struct mic_vdev *mvdev)
struct mic_vdev *tmp_mvdev; struct mic_vdev *tmp_mvdev;
struct mic_device *mdev = mvdev->mdev; struct mic_device *mdev = mvdev->mdev;
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
int i, ret, retry = 100; int i, ret, retry;
struct mic_vqconfig *vqconfig; struct mic_vqconfig *vqconfig;
struct mic_bootparam *bootparam = mdev->dp; struct mic_bootparam *bootparam = mdev->dp;
s8 db; s8 db;
@ -652,16 +652,16 @@ void mic_virtio_del_device(struct mic_vdev *mvdev)
"Requesting hot remove id %d\n", mvdev->virtio_id); "Requesting hot remove id %d\n", mvdev->virtio_id);
mvdev->dc->config_change = MIC_VIRTIO_PARAM_DEV_REMOVE; mvdev->dc->config_change = MIC_VIRTIO_PARAM_DEV_REMOVE;
mdev->ops->send_intr(mdev, db); mdev->ops->send_intr(mdev, db);
for (i = retry; i--;) { for (retry = 100; retry--;) {
ret = wait_event_timeout(wake, ret = wait_event_timeout(wake,
mvdev->dc->guest_ack, msecs_to_jiffies(100)); mvdev->dc->guest_ack, msecs_to_jiffies(100));
if (ret) if (ret)
break; break;
} }
dev_dbg(mdev->sdev->parent, dev_dbg(mdev->sdev->parent,
"Device id %d config_change %d guest_ack %d\n", "Device id %d config_change %d guest_ack %d retry %d\n",
mvdev->virtio_id, mvdev->dc->config_change, mvdev->virtio_id, mvdev->dc->config_change,
mvdev->dc->guest_ack); mvdev->dc->guest_ack, retry);
mvdev->dc->config_change = 0; mvdev->dc->config_change = 0;
mvdev->dc->guest_ack = 0; mvdev->dc->guest_ack = 0;
skip_hot_remove: skip_hot_remove: