@@ -435,6 +435,18 @@ config BLK_DEV_PMEM_USE_PAGES
to other devices in the system, then you must say "Yes" here.
If unsure leave as Yes.
+config BLK_DEV_PMEM_IGNORE_REQUEST_MEM_RET
+ bool "Ignore the return code from request_mem_region_exclusive"
+ depends on BLK_DEV_PMEM
+ help
+ In Old Kernels type-12 Memory type which is used by NvDIMM
+ chips Comes out busy when calling request_mem_region_exclusive,
+ because of a bug.
+ If this option is set to "yes". The pmem will ignore the
+ failure, and continue as usual. If you have an old Kernel and
+ a real NvDIMM chip you must say yes here.
+ (Ignored if BLK_DEV_PMEM_USE_PAGES=y)
+
config CDROM_PKTCDVD
tristate "Packet writing on CD/DVD media"
depends on !UML
@@ -172,8 +172,10 @@ int pmem_mapmem(struct pmem_device *pmem)
"pmem");
if (unlikely(!res_mem)) {
pr_warn("pmem: request_mem_region_exclusive phys=0x%llx size=0x%zx failed\n",
- pmem->phys_addr, pmem->size);
- return -EINVAL;
+ pmem->phys_addr, pmem->size);
+#ifndef CONFIG_BLK_DEV_PMEM_IGNORE_REQUEST_MEM_RET
+ return -EBUSY;
+#endif
}
pmem->virt_addr = ioremap_cache(pmem->phys_addr, pmem->size);
@@ -184,7 +186,8 @@ int pmem_mapmem(struct pmem_device *pmem)
return 0;
out_release:
- release_mem_region(pmem->phys_addr, pmem->size);
+ if (res_mem)
+ release_mem_region(pmem->phys_addr, pmem->size);
return err;
}
With old Kernels there was a bug in x86 where any unknown memory chip type would come up BUSY when calling request_mem_region_exclusive(). So for pmem to work with old Kernels and real NvDIMM chips we have a new Kconfig option CONFIG_BLK_DEV_PMEM_IGNORE_REQUEST_MEM_RET. People have been running with hacked up pmem that will ignore the return code from request_mem_region_exclusive. So here it is official Signed-off-by: Boaz Harrosh <boaz@plexistor.com> --- drivers/block/Kconfig | 12 ++++++++++++ drivers/block/pmem.c | 9 ++++++--- 2 files changed, 18 insertions(+), 3 deletions(-)