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usb: dwc3: debugfs: hold the lock in during mode change

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The read and write operation is atomic and we need no locking around
this operations. What we need however is a lock that is held which
ensures that the content of the DWC3_GCTL has not been changed. With
this, the conten may have been change changed after the first but before
our write back.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Sebastian Andrzej Siewior 2011-10-20 18:43:07 +02:00 committed by Felipe Balbi
parent 7ae4fc4dc8
commit c5537ea531
1 changed files with 0 additions and 2 deletions
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2
drivers/usb/dwc3/debugfs.c
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@ -451,7 +451,6 @@ static ssize_t dwc3_mode_write(struct file *file,
spin_lock_irqsave(&dwc->lock, flags);
reg = dwc3_readl(dwc->regs, DWC3_GCTL);
spin_unlock_irqrestore(&dwc->lock, flags);
reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
@ -464,7 +463,6 @@ static ssize_t dwc3_mode_write(struct file *file,
if (!strncmp(buf, "otg", 3))
reg |= DWC3_GCTL_PRTCAP(DWC3_GCTL_PRTCAP_OTG);
spin_lock_irqsave(&dwc->lock, flags);
dwc3_writel(dwc->regs, DWC3_GCTL, reg);
spin_unlock_irqrestore(&dwc->lock, flags);