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Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

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Pull libnvdimm fixes from Dan Williams:
 "A build fix, a NULL de-reference found by static analysis, a misuse of
  the percpu_ref_exit() (tagged for -stable), and notification of failed
  attempts to clear media errors.

  These patches have received a build success notification from the
  0day- kbuild-robot and appeared in next-20161028"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  device-dax: fix percpu_ref_exit ordering
  nvdimm: make CONFIG_NVDIMM_DAX 'bool'
  pmem: report error on clear poison failure
  libnvdimm, namespace: potential NULL deref on allocation error
This commit is contained in:
Linus Torvalds 2016-10-28 11:47:45 -07:00
commit ed99d3673e
5 changed files with 17 additions and 11 deletions
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2
drivers/dax/Kconfig
View File

@ -14,7 +14,7 @@ if DEV_DAX
config DEV_DAX_PMEM
tristate "PMEM DAX: direct access to persistent memory"
depends on NVDIMM_DAX
depends on LIBNVDIMM && NVDIMM_DAX
default DEV_DAX
help
Support raw access to persistent memory. Note that this

2
drivers/dax/pmem.c
View File

@ -44,7 +44,6 @@ static void dax_pmem_percpu_exit(void *data)
dev_dbg(dax_pmem->dev, "%s\n", __func__);
percpu_ref_exit(ref);
wait_for_completion(&dax_pmem->cmp);
}
static void dax_pmem_percpu_kill(void *data)
@ -54,6 +53,7 @@ static void dax_pmem_percpu_kill(void *data)
dev_dbg(dax_pmem->dev, "%s\n", __func__);
percpu_ref_kill(ref);
wait_for_completion(&dax_pmem->cmp);
}
static int dax_pmem_probe(struct device *dev)

2
drivers/nvdimm/Kconfig
View File

@ -89,7 +89,7 @@ config NVDIMM_PFN
Select Y if unsure
config NVDIMM_DAX
tristate "NVDIMM DAX: Raw access to persistent memory"
bool "NVDIMM DAX: Raw access to persistent memory"
default LIBNVDIMM
depends on NVDIMM_PFN
help

14
drivers/nvdimm/namespace_devs.c
View File

@ -2176,12 +2176,14 @@ static struct device **scan_labels(struct nd_region *nd_region)
return devs;
err:
for (i = 0; devs[i]; i++)
if (is_nd_blk(&nd_region->dev))
namespace_blk_release(devs[i]);
else
namespace_pmem_release(devs[i]);
kfree(devs);
if (devs) {
for (i = 0; devs[i]; i++)
if (is_nd_blk(&nd_region->dev))
namespace_blk_release(devs[i]);
else
namespace_pmem_release(devs[i]);
kfree(devs);
}
return NULL;
}

8
drivers/nvdimm/pmem.c
View File

@ -47,7 +47,7 @@ static struct nd_region *to_region(struct pmem_device *pmem)
return to_nd_region(to_dev(pmem)->parent);
}
static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
static int pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
unsigned int len)
{
struct device *dev = to_dev(pmem);
@ -62,8 +62,12 @@ static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
__func__, (unsigned long long) sector,
cleared / 512, cleared / 512 > 1 ? "s" : "");
badblocks_clear(&pmem->bb, sector, cleared / 512);
} else {
return -EIO;
}
invalidate_pmem(pmem->virt_addr + offset, len);
return 0;
}
static void write_pmem(void *pmem_addr, struct page *page,
@ -123,7 +127,7 @@ static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
flush_dcache_page(page);
write_pmem(pmem_addr, page, off, len);
if (unlikely(bad_pmem)) {
pmem_clear_poison(pmem, pmem_off, len);
rc = pmem_clear_poison(pmem, pmem_off, len);
write_pmem(pmem_addr, page, off, len);
}
}