Messages in this thread | | | From | Paul Zimmerman <> | Subject | RE: [PATCH] usb: dwc3: core: modify IO memory resource after deferred probe completes | Date | Fri, 26 Jul 2013 18:44:23 +0000 |
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> From: Felipe Balbi [mailto:balbi@ti.com] > Sent: Friday, July 26, 2013 2:54 AM > > > > Also, this is not *modifying* what was passed, just skipping the xHCI > > > > address space so we don't request_mem_region() an area we won't really > > > > handle and prevent xhci-hcd.ko from probing. > > > > > > Hmm? platform_get_resource() returns a pointer to an entry in the > > > platform_device's resource[] array. And "res->start +=" modifies the > > > entry pointed at. If it didn't, the bug fixed by this patch wouldn't > > > have happened. > > > > > > Are you sure this code will work OK if you build the driver as a module, > > > modprobe it, rmmod it, and then modprobe it again? Seems like it won't, > > > unless the dev->resource[] array gets reinitialized in between somehow. > > gotta try that one... Perhaps the correct way would be to copy the > resource to a private struct resource and modify that one, leaving > pdev->resources untouched.
Maybe this is a dumb question, but why can't the driver that is going to use the resource after this just "know" that it has to add DWC3_GLOBALS_REGS_START to the start address? Are there some versions of the core where that is not the case?
Or, maybe there should be two sets of resources?
-- Paul
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