From: Michael Opdenacker <michael.opdenacker@free-electrons.com>
To: gregkh@linuxfoundation.org
Cc: stern@rowland.harvard.edu, sarah.a.sharp@linux.intel.com,
tianyu.lan@intel.com, broonie@linaro.org,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Michael Opdenacker <michael.opdenacker@free-electrons.com>
Subject: [PATCH] usb/hcd: remove unnecessary local_irq_save
Date: Sun, 13 Oct 2013 09:14:19 +0200 [thread overview]
Message-ID: <1381648459-2957-1-git-send-email-michael.opdenacker@free-electrons.com> (raw)
Remove the use of local_irq_save() and IRQF_DISABLED, no longer needed since
interrupt handlers are always run with interrupts disabled on the
current CPU.
Tested successfully with 3.12.0-rc4 on my PC. Didn't find
any issue because of this change.
Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
---
drivers/usb/core/hcd.c | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index d6a8d23..1c309f1 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2324,15 +2324,8 @@ EXPORT_SYMBOL_GPL(usb_bus_start_enum);
irqreturn_t usb_hcd_irq (int irq, void *__hcd)
{
struct usb_hcd *hcd = __hcd;
- unsigned long flags;
irqreturn_t rc;
- /* IRQF_DISABLED doesn't work correctly with shared IRQs
- * when the first handler doesn't use it. So let's just
- * assume it's never used.
- */
- local_irq_save(flags);
-
if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
rc = IRQ_NONE;
else if (hcd->driver->irq(hcd) == IRQ_NONE)
@@ -2340,7 +2333,6 @@ irqreturn_t usb_hcd_irq (int irq, void *__hcd)
else
rc = IRQ_HANDLED;
- local_irq_restore(flags);
return rc;
}
EXPORT_SYMBOL_GPL(usb_hcd_irq);
@@ -2547,13 +2539,6 @@ static int usb_hcd_request_irqs(struct usb_hcd *hcd,
if (hcd->driver->irq) {
- /* IRQF_DISABLED doesn't work as advertised when used together
- * with IRQF_SHARED. As usb_hcd_irq() will always disable
- * interrupts we can remove it here.
- */
- if (irqflags & IRQF_SHARED)
- irqflags &= ~IRQF_DISABLED;
-
snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
hcd->driver->description, hcd->self.busnum);
retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
--
1.8.1.2
next reply other threads:[~2013-10-13 7:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-13 7:14 Michael Opdenacker [this message]
2013-10-13 15:35 ` Alan Stern
2013-10-14 3:23 ` Michael Opdenacker
2013-10-14 19:48 ` Alan Stern
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