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usb: chipidea: core: fix possible concurrent when switch role 

The user may call role_store() when driver is handling
ci_handle_id_switch() which is triggerred by otg event or power lost
event. Unfortunately, the controller may go into chaos in this case.
Fix this by protecting it with mutex lock.

Fixes: a932a8041f ("usb: chipidea: core: add sysfs group")
cc: <stable@vger.kernel.org>
Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20230317061516.2451728-2-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2023-03-17 14:15:16 +08:00 committed by Greg Kroah-Hartman
parent 3670de8067
commit 451b15ed13
3 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/chipidea/ci.h
View File

@ -208,6 +208,7 @@ struct hw_bank {
* @in_lpm: if the core in low power mode
* @wakeup_int: if wakeup interrupt occur
* @rev: The revision number for controller
* @mutex: protect code from concorrent running when doing role switch
*/
struct ci_hdrc {
struct device *dev;
@ -260,6 +261,7 @@ struct ci_hdrc {
bool in_lpm;
bool wakeup_int;
enum ci_revision rev;
struct mutex mutex;
};
static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)

8
drivers/usb/chipidea/core.c
View File

@ -987,8 +987,12 @@ static ssize_t role_store(struct device *dev,
if (role == CI_ROLE_END)
return -EINVAL;
if (role == ci->role)
mutex_lock(&ci->mutex);
if (role == ci->role) {
mutex_unlock(&ci->mutex);
return n;
}
pm_runtime_get_sync(dev);
disable_irq(ci->irq);
@ -998,6 +1002,7 @@ static ssize_t role_store(struct device *dev,
ci_handle_vbus_change(ci);
enable_irq(ci->irq);
pm_runtime_put_sync(dev);
mutex_unlock(&ci->mutex);
return (ret == 0) ? n : ret;
}
@ -1033,6 +1038,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
return -ENOMEM;
spin_lock_init(&ci->lock);
mutex_init(&ci->mutex);
ci->dev = dev;
ci->platdata = dev_get_platdata(dev);
ci->imx28_write_fix = !!(ci->platdata->flags &

5
drivers/usb/chipidea/otg.c
View File

@ -167,8 +167,10 @@ static int hw_wait_vbus_lower_bsv(struct ci_hdrc *ci)
void ci_handle_id_switch(struct ci_hdrc *ci)
{
enum ci_role role = ci_otg_role(ci);
enum ci_role role;
mutex_lock(&ci->mutex);
role = ci_otg_role(ci);
if (role != ci->role) {
dev_dbg(ci->dev, "switching from %s to %s\n",
ci_role(ci)->name, ci->roles[role]->name);
@ -198,6 +200,7 @@ void ci_handle_id_switch(struct ci_hdrc *ci)
if (role == CI_ROLE_GADGET)
ci_handle_vbus_change(ci);
}
mutex_unlock(&ci->mutex);
}
/**
* ci_otg_work - perform otg (vbus/id) event handle