[U-Boot] [patch 1/1] Make usb-stop() safe to call multiple times in a row.

["Markus Klotzbücher" <mk@denx.de>]

On Wed, Aug 20, 2008 at 11:22:02AM +0200, Remy Bohmer wrote:
> A recent commit (936897d4d1365452bbbdf8430db5e7769ef08d38)
> enabled the usb_stop() command in common/cmd_bootm.c which was
> not enabled for some time, because no board did actually set the
> CFG_CMD_USB flag. So, now the usb_stop() is executed before
> loading the linux kernel.
> 
> However, the usb_ohci driver hangs up (at least on AT91SAM) if the
> driver is stopped twice (e.g. the peripheral clock is stopped on AT91). 
> If some other piece of code calls usb_stop() before the bootm command, 
> this command will hangup the system during boot.
> (usb start and stop is typically used while booting from usb memory stick)
> 
> But, stopping the usb stack twice is useless anyway, and a flag already
> existed that kept track on the usb_init()/usb_stop() calls.
> So, we now check if the usb stack is really started before we stop it.
> 
> This problem is now fixed in both the upper as low-level layer.
> 
> Signed-off-by: Remy Bohmer <linux@bohmer.net>

Acked-by: Markus Klotzbuecher <mk@denx.de>

Wolfgang, please apply!

Best regards

Markus

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