diff options
Diffstat (limited to 'drivers/cxl/core/mbox.c')
| -rw-r--r-- | drivers/cxl/core/mbox.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 422999740649..82e79da195fa 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -221,6 +221,7 @@ static bool cxl_mem_raw_command_allowed(u16 opcode) * * %-EINVAL - Reserved fields or invalid values were used. * * %-ENOMEM - Input or output buffer wasn't sized properly. * * %-EPERM - Attempted to use a protected command. + * * %-EBUSY - Kernel has claimed exclusive access to this opcode * * The result of this command is a fully validated command in @out_cmd that is * safe to send to the hardware. @@ -296,6 +297,10 @@ static int cxl_validate_cmd_from_user(struct cxl_mem *cxlm, if (!test_bit(info->id, cxlm->enabled_cmds)) return -ENOTTY; + /* Check that the command is not claimed for exclusive kernel use */ + if (test_bit(info->id, cxlm->exclusive_cmds)) + return -EBUSY; + /* Check the input buffer is the expected size */ if (info->size_in >= 0 && info->size_in != send_cmd->in.size) return -ENOMEM; |