This patch series contains stability fixes and error handling for remoteproc.
The changes included in this series do the following:
Patch 1: Fixes the creation of the rproc character device.
Patch 2: Validates rproc as the first step of rproc_add().
Patch 3: Fixes the rproc cdev remove and the order of dev_del() and cdev_del().
Patch 4: Adds error handling in rproc_add().
v1 -> v2:
- Added extra patch which addresses Bjorn's comments on patch 3
from v1.
- Fixed commit text for patch 2 (s/calling making/making).
Siddharth Gupta (4):
remoteproc: core: Move cdev add before device add
remoteproc: core: Move validate before device add
remoteproc: core: Fix cdev remove and rproc del
remoteproc: core: Cleanup device in case of failure
0000-cover-letter.patch.backup | 26 ++++++++++++++++++++++++++
drivers/remoteproc/remoteproc_cdev.c | 2 +-
drivers/remoteproc/remoteproc_core.c | 27 ++++++++++++++++++---------
3 files changed, 45 insertions(+), 10 deletions(-)
create mode 100644 0000-cover-letter.patch.backup
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
When a failure occurs in rproc_add() it returns an error, but does
not cleanup after itself. This change adds the failure path in such
cases.
Signed-off-by: Siddharth Gupta <[email protected]>
---
drivers/remoteproc/remoteproc_core.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index b874280..d823f70 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2343,8 +2343,10 @@ int rproc_add(struct rproc *rproc)
return ret;
ret = device_add(dev);
- if (ret < 0)
- return ret;
+ if (ret < 0) {
+ put_device(dev);
+ goto rproc_remove_cdev;
+ }
dev_info(dev, "%s is available\n", rproc->name);
@@ -2355,7 +2357,7 @@ int rproc_add(struct rproc *rproc)
if (rproc->auto_boot) {
ret = rproc_trigger_auto_boot(rproc);
if (ret < 0)
- return ret;
+ goto rproc_remove_dev;
}
/* expose to rproc_get_by_phandle users */
@@ -2364,6 +2366,13 @@ int rproc_add(struct rproc *rproc)
mutex_unlock(&rproc_list_mutex);
return 0;
+
+rproc_remove_dev:
+ rproc_delete_debug_dir(rproc);
+ device_del(dev);
+rproc_remove_cdev:
+ rproc_char_device_remove(rproc);
+ return ret;
}
EXPORT_SYMBOL(rproc_add);
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
We can validate whether the remoteproc is correctly setup before
making the cdev_add and device_add calls. This saves us the
trouble of cleaning up later on.
Signed-off-by: Siddharth Gupta <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
---
drivers/remoteproc/remoteproc_core.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 9ad8c5f..b65fce3 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2333,16 +2333,16 @@ int rproc_add(struct rproc *rproc)
struct device *dev = &rproc->dev;
int ret;
- /* add char device for this remoteproc */
- ret = rproc_char_device_add(rproc);
+ ret = rproc_validate(rproc);
if (ret < 0)
return ret;
- ret = device_add(dev);
+ /* add char device for this remoteproc */
+ ret = rproc_char_device_add(rproc);
if (ret < 0)
return ret;
- ret = rproc_validate(rproc);
+ ret = device_add(dev);
if (ret < 0)
return ret;
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
When cdev_add is called after device_add has been called there is no
way for the userspace to know about the addition of a cdev as cdev_add
itself doesn't trigger a uevent notification, or for the kernel to
know about the change to devt. This results in two problems:
- mknod is never called for the cdev and hence no cdev appears on
devtmpfs.
- sysfs links to the new cdev are not established.
The cdev needs to be added and devt assigned before device_add() is
called in order for the relevant sysfs and devtmpfs entries to be
created and the uevent to be properly populated.
Signed-off-by: Siddharth Gupta <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
---
drivers/remoteproc/remoteproc_core.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 6348aaa..9ad8c5f 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2333,6 +2333,11 @@ int rproc_add(struct rproc *rproc)
struct device *dev = &rproc->dev;
int ret;
+ /* add char device for this remoteproc */
+ ret = rproc_char_device_add(rproc);
+ if (ret < 0)
+ return ret;
+
ret = device_add(dev);
if (ret < 0)
return ret;
@@ -2346,11 +2351,6 @@ int rproc_add(struct rproc *rproc)
/* create debugfs entries */
rproc_create_debug_dir(rproc);
- /* add char device for this remoteproc */
- ret = rproc_char_device_add(rproc);
- if (ret < 0)
- return ret;
-
/* if rproc is marked always-on, request it to boot */
if (rproc->auto_boot) {
ret = rproc_trigger_auto_boot(rproc);
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
On Mon 14 Jun 15:40 CDT 2021, Siddharth Gupta wrote:
> This patch series contains stability fixes and error handling for remoteproc.
>
Thanks for respinning this Sid, I think patch 3 looks good now as well,
but it seems you accidentally got an additional file in the same patch.
Can you please fix that up and resend the patches?
Regards,
Bjorn
> The changes included in this series do the following:
> Patch 1: Fixes the creation of the rproc character device.
> Patch 2: Validates rproc as the first step of rproc_add().
> Patch 3: Fixes the rproc cdev remove and the order of dev_del() and cdev_del().
> Patch 4: Adds error handling in rproc_add().
>
> v1 -> v2:
> - Added extra patch which addresses Bjorn's comments on patch 3
> from v1.
> - Fixed commit text for patch 2 (s/calling making/making).
>
> Siddharth Gupta (4):
> remoteproc: core: Move cdev add before device add
> remoteproc: core: Move validate before device add
> remoteproc: core: Fix cdev remove and rproc del
> remoteproc: core: Cleanup device in case of failure
>
> 0000-cover-letter.patch.backup | 26 ++++++++++++++++++++++++++
> drivers/remoteproc/remoteproc_cdev.c | 2 +-
> drivers/remoteproc/remoteproc_core.c | 27 ++++++++++++++++++---------
> 3 files changed, 45 insertions(+), 10 deletions(-)
> create mode 100644 0000-cover-letter.patch.backup
>
> --
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>