acpi/nfit: Fix bus command validation

commit ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 upstream.

Commit 11189c1089da "acpi/nfit: Fix command-supported detection" broke
ND_CMD_CALL for bus-level commands. The "func = cmd" assumption is only
valid for:

    ND_CMD_ARS_CAP
    ND_CMD_ARS_START
    ND_CMD_ARS_STATUS
    ND_CMD_CLEAR_ERROR

The function number otherwise needs to be pulled from the command
payload for:

    NFIT_CMD_TRANSLATE_SPA
    NFIT_CMD_ARS_INJECT_SET
    NFIT_CMD_ARS_INJECT_CLEAR
    NFIT_CMD_ARS_INJECT_GET

Update cmd_to_func() for the bus case and call it in the common path.

Fixes: 11189c1089da ("acpi/nfit: Fix command-supported detection")
Cc: <stable@vger.kernel.org>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: Grzegorz Burzynski <grzegorz.burzynski@intel.com>
Tested-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 142f6a4..f77d01c 100644 (file)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -397,7 +397,7 @@ static int cmd_to_func(struct nfit_mem *nfit_mem, unsigned int cmd,
        if (call_pkg) {
                int i;
 
-               if (nfit_mem->family != call_pkg->nd_family)
+               if (nfit_mem && nfit_mem->family != call_pkg->nd_family)
                        return -ENOTTY;
 
                for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
@@ -406,6 +406,10 @@ static int cmd_to_func(struct nfit_mem *nfit_mem, unsigned int cmd,
                return call_pkg->nd_command;
        }
 
+       /* In the !call_pkg case, bus commands == bus functions */
+       if (!nfit_mem)
+               return cmd;
+
        /* Linux ND commands == NVDIMM_FAMILY_INTEL function numbers */
        if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
                return cmd;
@@ -436,17 +440,18 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
        if (cmd_rc)
                *cmd_rc = -EINVAL;
 
+       if (cmd == ND_CMD_CALL)
+               call_pkg = buf;
+       func = cmd_to_func(nfit_mem, cmd, call_pkg);
+       if (func < 0)
+               return func;
+
        if (nvdimm) {
                struct acpi_device *adev = nfit_mem->adev;
 
                if (!adev)
                        return -ENOTTY;
 
-               if (cmd == ND_CMD_CALL)
-                       call_pkg = buf;
-               func = cmd_to_func(nfit_mem, cmd, call_pkg);
-               if (func < 0)
-                       return func;
                dimm_name = nvdimm_name(nvdimm);
                cmd_name = nvdimm_cmd_name(cmd);
                cmd_mask = nvdimm_cmd_mask(nvdimm);
@@ -457,12 +462,9 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
        } else {
                struct acpi_device *adev = to_acpi_dev(acpi_desc);
 
-               func = cmd;
                cmd_name = nvdimm_bus_cmd_name(cmd);
                cmd_mask = nd_desc->cmd_mask;
-               dsm_mask = cmd_mask;
-               if (cmd == ND_CMD_CALL)
-                       dsm_mask = nd_desc->bus_dsm_mask;
+               dsm_mask = nd_desc->bus_dsm_mask;
                desc = nd_cmd_bus_desc(cmd);
                guid = to_nfit_uuid(NFIT_DEV_BUS);
                handle = adev->handle;