android/android_kernel_samsung_sm8650
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

UPSTREAM: usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group

Browse Source 
The DisplayPort driver's sysfs nodes may be present to the userspace before
typec_altmode_set_drvdata() completes in dp_altmode_probe. This means that
a sysfs read can trigger a NULL pointer error by deferencing dp->hpd in
hpd_show or dp->lock in pin_assignment_show, as dev_get_drvdata() returns
NULL in those cases.

Remove manual sysfs node creation in favor of adding attribute group as
default for devices bound to the driver. The ATTRIBUTE_GROUPS() macro is
not used here otherwise the path to the sysfs nodes is no longer compliant
with the ABI.

Fixes: 0e3bb7d689 ("usb: typec: Add driver for DisplayPort alternate mode")
Cc: stable@vger.kernel.org
Signed-off-by: RD Babiera <rdbabiera@google.com>
Link: https://lore.kernel.org/r/20240229001101.3889432-2-rdbabiera@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 313517804
(cherry picked from commit 165376f6b23e9a779850e750fb2eb06622e5a531)
Signed-off-by: RD Babiera <rdbabiera@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:884fea555f0af00dee9fefefa5bb38eb4ed251b5)
Merged-In: I13aaa956ff2b37e29eb0d90bbac0b7e1ac969b80
Change-Id: I13aaa956ff2b37e29eb0d90bbac0b7e1ac969b80
This commit is contained in:
RD Babiera 2024-03-07 22:09:02 +00:00 committed by Treehugger Robot
parent 981ffd6df1
commit bb197cebd5
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/usb/typec/altmodes/displayport.c
View File

@ -552,16 +552,21 @@ static ssize_t hpd_show(struct device *dev, struct device_attribute *attr, char
}
static DEVICE_ATTR_RO(hpd);
static struct attribute *dp_altmode_attrs[] = {
static struct attribute *displayport_attrs[] = {
&dev_attr_configuration.attr,
&dev_attr_pin_assignment.attr,
&dev_attr_hpd.attr,
NULL
};
static const struct attribute_group dp_altmode_group = {
static const struct attribute_group displayport_group = {
.name = "displayport",
.attrs = dp_altmode_attrs,
.attrs = displayport_attrs,
};
static const struct attribute_group *displayport_groups[] = {
&displayport_group,
NULL,
};
int dp_altmode_probe(struct typec_altmode *alt)
@ -569,7 +574,6 @@ int dp_altmode_probe(struct typec_altmode *alt)
const struct typec_altmode *port = typec_altmode_get_partner(alt);
struct fwnode_handle *fwnode;
struct dp_altmode *dp;
int ret;
/* FIXME: Port can only be DFP_U. */
@ -580,10 +584,6 @@ int dp_altmode_probe(struct typec_altmode *alt)
DP_CAP_PIN_ASSIGN_DFP_D(alt->vdo)))
return -ENODEV;
ret = sysfs_create_group(&alt->dev.kobj, &dp_altmode_group);
if (ret)
return ret;
dp = devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL);
if (!dp)
return -ENOMEM;
@ -614,7 +614,6 @@ void dp_altmode_remove(struct typec_altmode *alt)
{
struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
sysfs_remove_group(&alt->dev.kobj, &dp_altmode_group);
cancel_work_sync(&dp->work);
if (dp->connector_fwnode) {
@ -639,6 +638,7 @@ static struct typec_altmode_driver dp_altmode_driver = {
.driver = {
.name = "typec_displayport",
.owner = THIS_MODULE,
.dev_groups = displayport_groups,
},
};
module_typec_altmode_driver(dp_altmode_driver);