request_mem_region

[Daniel Redway]

Hello

As I understand ioremap() maps and returns virtual address
for a given physical(bus) address associated with my PCI card.
That is cool and clear.


What is the purpose of request_mem_region()?
They both take physical address as a parameter, but do not return any
virt addresses.

1. What do they allocate/reserve and where?
2. Should I call reques_mem_region() before doing ioremap() or not?


thanks
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