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usb: gadget: pch_udc: Revert d3cb25a121 completely 

commit 50a318cc9b54a36f00beadf77e578a50f3620477 upstream.

The commit d3cb25a121 ("usb: gadget: udc: fix spin_lock in pch_udc")
obviously was not thought through and had made the situation even worse
than it was before. Two changes after almost reverted it. but a few
leftovers have been left as it. With this revert d3cb25a121 completely.

While at it, narrow down the scope of unlocked section to prevent
potential race when prot_stall is assigned.

Fixes: d3cb25a121 ("usb: gadget: udc: fix spin_lock in pch_udc")
Fixes: 9903b6bedd ("usb: gadget: pch-udc: fix lock")
Fixes: 1d23d16a88 ("usb: gadget: pch_udc: reorder spin_[un]lock to avoid deadlock")
Cc: Iago Abal <mail@iagoabal.eu>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210323153626.54908-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2021-03-23 17:36:24 +02:00 committed by Greg Kroah-Hartman
parent db699975f7
commit 52189bf0b2
1 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/usb/gadget/udc/pch_udc.c
View File

@ -600,18 +600,22 @@ static void pch_udc_reconnect(struct pch_udc_dev *dev)
static inline void pch_udc_vbus_session(struct pch_udc_dev *dev,
int is_active)
{
unsigned long iflags;
spin_lock_irqsave(&dev->lock, iflags);
if (is_active) {
pch_udc_reconnect(dev);
dev->vbus_session = 1;
} else {
if (dev->driver && dev->driver->disconnect) {
spin_lock(&dev->lock);
spin_unlock_irqrestore(&dev->lock, iflags);
dev->driver->disconnect(&dev->gadget);
spin_unlock(&dev->lock);
spin_lock_irqsave(&dev->lock, iflags);
}
pch_udc_set_disconnect(dev);
dev->vbus_session = 0;
}
spin_unlock_irqrestore(&dev->lock, iflags);
}
/**
@ -1168,20 +1172,25 @@ static int pch_udc_pcd_selfpowered(struct usb_gadget *gadget, int value)
static int pch_udc_pcd_pullup(struct usb_gadget *gadget, int is_on)
{
struct pch_udc_dev *dev;
unsigned long iflags;
if (!gadget)
return -EINVAL;
dev = container_of(gadget, struct pch_udc_dev, gadget);
spin_lock_irqsave(&dev->lock, iflags);
if (is_on) {
pch_udc_reconnect(dev);
} else {
if (dev->driver && dev->driver->disconnect) {
spin_lock(&dev->lock);
spin_unlock_irqrestore(&dev->lock, iflags);
dev->driver->disconnect(&dev->gadget);
spin_unlock(&dev->lock);
spin_lock_irqsave(&dev->lock, iflags);
}
pch_udc_set_disconnect(dev);
}
spin_unlock_irqrestore(&dev->lock, iflags);
return 0;
}