From: Oliver Neukum <oliver@neukum.org>
To: David Miller <davem@davemloft.net>
Cc: arnd@arndb.de, ceggers@gmx.de, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH] usb/mcs7830: Don't use buffers from stack for USB transfers
Date: Wed, 21 Jan 2009 00:36:49 +0100 [thread overview]
Message-ID: <200901210036.51681.oliver@neukum.org> (raw)
In-Reply-To: <20090120.152345.78877396.davem@davemloft.net>
Am Wednesday 21 January 2009 00:23:45 schrieb David Miller:
> > GFP_NOIO seems out of place in a network driver: there is nothing
> > wrong with waiting for I/O here, so plain GFP_KERNEL should be fine.
>
> There seems to be a large precendence for this in other USB drivers,
> both for networking and storage. Probably a mutex or other locking
> hierarchy issue.
Usb storage uses a lot of infrastructure in error handling. As a storage
interface and another interface can share a device and be reset only
together. All drivers' reset handling must be written as if they were
block devices. Therefore you see a lot of GFP_NOIO in USB.
Regards
Oliver
next prev parent reply other threads:[~2009-01-20 23:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-20 20:29 Christian Eggers
2009-01-20 20:32 ` David Miller
2009-01-20 22:45 ` Arnd Bergmann
2009-01-20 22:47 ` David Miller
2009-01-20 23:17 ` Arnd Bergmann
2009-01-20 23:23 ` David Miller
2009-01-20 23:36 ` Oliver Neukum [this message]
2009-01-20 23:37 ` Arnd Bergmann
2009-01-20 23:39 ` David Miller
2009-01-20 23:28 ` Oliver Neukum
2009-01-20 22:50 ` Oliver Neukum
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