On Tue, Jun 9, 2020 at 12:47 PM Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote: > > We recently introduced a bug when we tried to convert of_iomap() to > devm_of_iomap(). The problem was that there were two drivers mapping > the same io region. The first driver was using of_iomap() and the > second driver was using devm_of_iomap() and the kernel booted fine. > When we converted the first drive to use devm_of_iomap() then the second > driver failed with -EBUSY and the kernel couldn't boot. > > Let's add a comment to prevent this sort of mistake in the future. > > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Good idea, Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
