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| author | Shengjiu Wang <shengjiu.wang@nxp.com> | 2022-03-28 05:20:12 +0300 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2022-04-14 20:13:33 +0300 |
| commit | 5e6a0e05270e3a4bb9289a0415d062966c27d192 (patch) | |
| tree | 3775198a18e92b4de73c50d493a1c6b2ad193c5c /drivers/remoteproc | |
| parent | 8f454f950dbb663180f596db18c3dc7ec26497f0 (diff) | |
| download | linux-5e6a0e05270e3a4bb9289a0415d062966c27d192.tar.xz | |
remoteproc: core: Move state checking to remoteproc_core
There is no mutex protection of these state checking for 'stop'
and 'detach' which can't guarantee there is no another instance
is trying to do same operation.
Consider two instances case:
Instance1: echo stop > /sys/class/remoteproc/remoteproc0/state
Instance2: echo stop > /sys/class/remoteproc/remoteproc0/state
The issue is that the instance2 case may success, Or it
may fail with -EINVAL, which is uncertain.
So move this state checking in rproc_cdev_write() and
state_store() for 'stop', 'detach' operation to
'rproc_shutdown' , 'rproc_detach' function under the mutex
protection.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1648434012-16655-3-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/remoteproc_cdev.c | 7 | ||||
| -rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 11 | ||||
| -rw-r--r-- | drivers/remoteproc/remoteproc_sysfs.c | 7 |
3 files changed, 11 insertions, 14 deletions
diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c index 62001eda780c..687f205fd70a 100644 --- a/drivers/remoteproc/remoteproc_cdev.c +++ b/drivers/remoteproc/remoteproc_cdev.c @@ -34,15 +34,8 @@ static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_ if (!strncmp(cmd, "start", len)) { ret = rproc_boot(rproc); } else if (!strncmp(cmd, "stop", len)) { - if (rproc->state != RPROC_RUNNING && - rproc->state != RPROC_ATTACHED) - return -EINVAL; - ret = rproc_shutdown(rproc); } else if (!strncmp(cmd, "detach", len)) { - if (rproc->state != RPROC_ATTACHED) - return -EINVAL; - ret = rproc_detach(rproc); } else { dev_err(&rproc->dev, "Unrecognized option\n"); diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 3c8382f66ce2..02a04ab34a23 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -2071,6 +2071,12 @@ int rproc_shutdown(struct rproc *rproc) return ret; } + if (rproc->state != RPROC_RUNNING && + rproc->state != RPROC_ATTACHED) { + ret = -EINVAL; + goto out; + } + /* if the remote proc is still needed, bail out */ if (!atomic_dec_and_test(&rproc->power)) goto out; @@ -2130,6 +2136,11 @@ int rproc_detach(struct rproc *rproc) return ret; } + if (rproc->state != RPROC_ATTACHED) { + ret = -EINVAL; + goto out; + } + /* if the remote proc is still needed, bail out */ if (!atomic_dec_and_test(&rproc->power)) { ret = 0; diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c index ac64d69085ab..8c7ea8922638 100644 --- a/drivers/remoteproc/remoteproc_sysfs.c +++ b/drivers/remoteproc/remoteproc_sysfs.c @@ -198,15 +198,8 @@ static ssize_t state_store(struct device *dev, if (ret) dev_err(&rproc->dev, "Boot failed: %d\n", ret); } else if (sysfs_streq(buf, "stop")) { - if (rproc->state != RPROC_RUNNING && - rproc->state != RPROC_ATTACHED) - return -EINVAL; - ret = rproc_shutdown(rproc); } else if (sysfs_streq(buf, "detach")) { - if (rproc->state != RPROC_ATTACHED) - return -EINVAL; - ret = rproc_detach(rproc); } else { dev_err(&rproc->dev, "Unrecognised option: %s\n", buf); |