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libnvdimm, pmem: fix kmap_atomic() leak in error path 

When we enounter a bad block we need to kunmap_atomic() before
returning.

Cc: <stable@vger.kernel.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-03-06 15:20:51 -08:00
parent d4f323672a
commit b5ebc8ec69
1 changed files with 7 additions and 4 deletions
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11
drivers/nvdimm/pmem.c
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@ -66,22 +66,25 @@ static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
unsigned int len, unsigned int off, int rw,
sector_t sector)
{
int rc = 0;
void *mem = kmap_atomic(page);
phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
void __pmem *pmem_addr = pmem->virt_addr + pmem_off;
if (rw == READ) {
if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
return -EIO;
memcpy_from_pmem(mem + off, pmem_addr, len);
flush_dcache_page(page);
rc = -EIO;
else {
memcpy_from_pmem(mem + off, pmem_addr, len);
flush_dcache_page(page);
}
} else {
flush_dcache_page(page);
memcpy_to_pmem(pmem_addr, mem + off, len);
}
kunmap_atomic(mem);
return 0;
return rc;
}
static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)