> The UEFI spec does not permit runtime services to be called reentrantly, and 
> so
> it is up to the OS to provide proper locking around such calls.
> For the native case, this was fixed a long time ago, but for the mixed mode 
> case,
> no locking is done whatsoever. Note that the calls are made with preemption
> and interrupts disabled, so only SMP configurations are affected by this 
> issue.
> So add a spinlock and grab it when invoking a UEFI runtime service in mixed
> mode. We will also need to provide non-blocking versions of SetVariable() and
> QueryVariableInfo(), so add those as well.
> Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>

FWIW, this patch looks good to me.

To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to