> 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.biesheuvel@xxxxxxxxxx> FWIW, this patch looks good to me. Regards, Sai -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
