linux-kernel - Re: [PATCH] usb/hcd: remove unnecessary local_irq

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Date:	Mon, 14 Oct 2013 05:23:23 +0200
From:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	gregkh@...uxfoundation.org, sarah.a.sharp@...ux.intel.com,
	tianyu.lan@...el.com, broonie@...aro.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb/hcd: remove unnecessary local_irq_save

Hi Alan,

On 10/13/2013 05:35 PM, Alan Stern wrote:
> On Sun, 13 Oct 2013, Michael Opdenacker wrote:
>
>> 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@...e-electrons.com>
>> ---
>>  drivers/usb/core/hcd.c | 15 ---------------
>>  1 file changed, 15 deletions(-)
> How about removing all the other unnecessary usages of IRQF_DISABLED
> under drivers/usb while you're at it?
I believe I already did, through patches sent on Oct. 6:

drivers/usb/gadget/mv_u3d_core.c:               IRQF_DISABLED |
IRQF_SHARED, driver_name, u3d)) {
=> Sent fix on Oct. 6, 2013

drivers/usb/host/uhci-platform.c:       ret = usb_add_hcd(hcd,
pdev->resource[1].start, IRQF_DISABLED |
=> Sent fix on Oct. 6, 2013

Cheers,

Michael.

-- 
Michael Opdenacker, CEO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
+33 484 258 098

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