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cxl/mbox: Move cxl_mem_command param to a local variable

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cxl_validate_command_from_user() is now the single point of validation
for mailbox commands coming from user space. Previously, it returned a
a cxl_mem_command, but that was not sufficient when validation of the
actual mailbox command became a requirement. Now, it returns a fully
validated cxl_mbox_cmd.

Remove the extraneous cxl_mem_command parameter. Define and use a
local version only.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/c11a437896d914daf36f5ac8ec62f999c5ec2da7.1648687552.git.alison.schofield@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Alison Schofield 2022-03-30 18:27:17 -07:00 committed by Dan Williams
parent d97fe8eec2
commit 2dd5600a0e
1 changed files with 8 additions and 12 deletions
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20
drivers/cxl/core/mbox.c
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@ -338,7 +338,6 @@ static int cxl_to_mem_cmd(struct cxl_mem_command *mem_cmd,
* @mbox_cmd: Sanitized and populated &struct cxl_mbox_cmd.
* @cxlds: The device data for the operation
* @send_cmd: &struct cxl_send_command copied in from userspace.
* @out_cmd: Sanitized and populated &struct cxl_mem_command.
*
* Return:
* * %0 - @out_cmd is ready to send.
@ -348,16 +347,14 @@ static int cxl_to_mem_cmd(struct cxl_mem_command *mem_cmd,
* * %-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
* The result of this command is a fully validated command in @mbox_cmd that is
* safe to send to the hardware.
*
* See handle_mailbox_cmd_from_user()
*/
static int cxl_validate_cmd_from_user(struct cxl_mbox_cmd *mbox_cmd,
struct cxl_dev_state *cxlds,
const struct cxl_send_command *send_cmd,
struct cxl_mem_command *out_cmd)
const struct cxl_send_command *send_cmd)
{
struct cxl_mem_command mem_cmd;
int rc;
if (send_cmd->id == 0 || send_cmd->id >= CXL_MEM_COMMAND_ID_MAX)
@ -373,16 +370,16 @@ static int cxl_validate_cmd_from_user(struct cxl_mbox_cmd *mbox_cmd,
/* Sanitize and construct a cxl_mem_command */
if (send_cmd->id == CXL_MEM_COMMAND_ID_RAW)
rc = cxl_to_mem_cmd_raw(out_cmd, send_cmd, cxlds);
rc = cxl_to_mem_cmd_raw(&mem_cmd, send_cmd, cxlds);
else
rc = cxl_to_mem_cmd(out_cmd, send_cmd, cxlds);
rc = cxl_to_mem_cmd(&mem_cmd, send_cmd, cxlds);
if (rc)
return rc;
/* Sanitize and construct a cxl_mbox_cmd */
return cxl_mbox_cmd_ctor(mbox_cmd, cxlds, out_cmd->opcode,
out_cmd->info.size_in, out_cmd->info.size_out,
return cxl_mbox_cmd_ctor(mbox_cmd, cxlds, mem_cmd.opcode,
mem_cmd.info.size_in, mem_cmd.info.size_out,
send_cmd->in.payload);
}
@ -490,7 +487,6 @@ int cxl_send_cmd(struct cxl_memdev *cxlmd, struct cxl_send_command __user *s)
struct cxl_dev_state *cxlds = cxlmd->cxlds;
struct device *dev = &cxlmd->dev;
struct cxl_send_command send;
struct cxl_mem_command c;
struct cxl_mbox_cmd mbox_cmd;
int rc;
@ -499,7 +495,7 @@ int cxl_send_cmd(struct cxl_memdev *cxlmd, struct cxl_send_command __user *s)
if (copy_from_user(&send, s, sizeof(send)))
return -EFAULT;
rc = cxl_validate_cmd_from_user(&mbox_cmd, cxlmd->cxlds, &send, &c);
rc = cxl_validate_cmd_from_user(&mbox_cmd, cxlmd->cxlds, &send);
if (rc)
return rc;