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SubjectRe: [PATCH v4 2/9] x86: support kmap_atomic_pfn_t() for persistent memory
On Wed, Jun 10, 2015 at 02:12:02PM +0200, Christoph Hellwig wrote:
> Btw, I don't think this actually is safe without refcounting your kmap
> structure.
>
> The driver model ->remove callback can be called at any time, which
> will ioremap the memory and remap the kmap structure. But at this
> point a user might still be using it.

Won't the device data structures be pinned by the refcount on the bdev?


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