On Wed, Jun 10, 2015 at 11:03:35AM -0400, Matthew Wilcox wrote: > 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?
An open filesystem only keeps a reference on the request_queue. The underlying driver model ->remove method will still be called on a surprise removal. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
