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8aa442cfce
When dev_dax_kmem_probe() partially succeeds (at least one range is
mapped) but a subsequent range fails request_mem_region() or
add_memory_driver_managed(), the probe silently continues, ultimately
returning success, but with the corresponding range resource NULL'ed out.
dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if
the underlying resource exists. When remove_memory() is called later, it
returns 0 because the memory was never added which causes
dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can
be removed and attempts cleanup on a NULL pointer.
Fix this by skipping these ranges altogether, noting that these cases are
considered success, such that the cleanup is still reached when all
actually-added ranges are successfully removed.
Link: https://lore.kernel.org/20260223201516.1517657-1-dave@stgolabs.net
Fixes:
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History
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|---|---|---|
| .. | ||
| hmem | ||
| bus.c | ||
| bus.h | ||
| cxl.c | ||
| dax-private.h | ||
| device.c | ||
| fsdev.c | ||
| Kconfig | ||
| kmem.c | ||
| Makefile | ||
| pmem.c | ||
| super.c | ||