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| author | Jason Wessel <jason.wessel@windriver.com> | 2009-08-20 15:39:56 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-23 06:46:38 -0700 |
| commit | 68d2956a810b5c1b8213a1a9f59eacc54d7ce087 (patch) | |
| tree | ce63aa5c1580b217af7ddd21fecee7cd2cca6c77 /Documentation | |
| parent | aab2d4086a1876fcff282aa36e2d4a92aa9935c9 (diff) | |
| download | linux-68d2956a810b5c1b8213a1a9f59eacc54d7ce087.tar.gz | |
USB: ehci-dbgp: errata for EHCI debug/host controller synchronization
On some EHCI debug controllers after the host controller driver is activated, the debug controller will occasionally fail to submit a bulk write URB. On controllers that exhibit this behavior a dummy bulk write must get submitted to resynchronize the device. The "dummy bulk write" does not get received by the host attached to the other end of the usb debug device. The usb debug device simply acknowledges the "dummy bulk write" and returns to a usable state. The behavior, without this patch is that you see missing text from a complete kernel boot when using the keep option to the earlyprintk kernel argument. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
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