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regulator: virtio: wait for backend response forever

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Since guest virtual machine may be scheduled out by host for an uncertain
time, we change the waiting for backend response from 200ms timeout to no
timeout.

Change-Id: If52f167091f67c69fdc5082404e966019de41e5e
Signed-off-by: Zhiqiang Tu <ztu@codeaurora.org>
tirimbino
Zhiqiang Tu 5 years ago
parent 6b3f84f45b
commit 26888d5a69
1 changed files with 7 additions and 43 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 50
      drivers/regulator/virtio_regulator.c

50
drivers/regulator/virtio_regulator.c
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@ -27,7 +27,6 @@
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#define VIRTIO_REGULATOR_TIMEOUT 200 /* miliseconds */
#define VIRTIO_REGULATOR_MAX_NAME 20
#define VIRTIO_REGULATOR_VOLTAGE_UNKNOWN 1
@ -78,12 +77,7 @@ static int virtio_regulator_enable(struct regulator_dev *rdev)
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {
@ -132,12 +126,7 @@ static int virtio_regulator_disable(struct regulator_dev *rdev)
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {
@ -198,12 +187,7 @@ static int virtio_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {
@ -250,12 +234,7 @@ static int virtio_regulator_get_voltage(struct regulator_dev *rdev)
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {
@ -309,12 +288,7 @@ static int virtio_regulator_set_mode(struct regulator_dev *rdev,
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {
@ -361,12 +335,7 @@ static unsigned int virtio_regulator_get_mode(struct regulator_dev *rdev)
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {
@ -419,12 +388,7 @@ static int virtio_regulator_set_load(struct regulator_dev *rdev, int load_ua)
virtqueue_kick(vreg->vq);
ret = wait_for_completion_timeout(&vreg->rsp_avail,
msecs_to_jiffies(VIRTIO_REGULATOR_TIMEOUT));
if (!ret) {
ret = -ETIMEDOUT;
goto out;
}
wait_for_completion(&vreg->rsp_avail);
rsp = virtqueue_get_buf(vreg->vq, &len);
if (!rsp) {

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