forked from luck/tmp_suning_uos_patched
device-dax: check devm_nsio_enable() return value
If the dax_pmem driver is passed a resource that is already busy the
driver probe attempt should fail with a message like the following:
dax_pmem dax0.1: could not reserve region [mem 0x100000000-0x11fffffff]
However, if we do not catch the error we crash for the obvious reason of
accessing memory that is not mapped.
BUG: unable to handle kernel paging request at ffffc90020001000
IP: [<ffffffff81496712>] __memcpy+0x12/0x20
[..]
Call Trace:
[<ffffffff815c4960>] ? nsio_rw_bytes+0x60/0x180
[<ffffffff815c6045>] nd_pfn_validate+0x75/0x320
[<ffffffff815c63a9>] nvdimm_setup_pfn+0xb9/0x5d0
[<ffffffff815c48ef>] ? devm_nsio_enable+0xff/0x110
[<ffffffff815cb699>] dax_pmem_probe+0x59/0x260
Cc: <stable@vger.kernel.org>
Fixes: ab68f26221
("/dev/dax, pmem: direct access to persistent memory")
Reported-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
parent
ed99d3673e
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6a84fb4b4e
@ -78,7 +78,9 @@ static int dax_pmem_probe(struct device *dev)
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nsio = to_nd_namespace_io(&ndns->dev);
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/* parse the 'pfn' info block via ->rw_bytes */
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devm_nsio_enable(dev, nsio);
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rc = devm_nsio_enable(dev, nsio);
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if (rc)
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return rc;
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altmap = nvdimm_setup_pfn(nd_pfn, &res, &__altmap);
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if (IS_ERR(altmap))
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return PTR_ERR(altmap);
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