[PATCH v2] platform/x86/intel/tpmi: Use 32 bit aligned address for debugfs mem write

[PATCH v2] platform/x86/intel/tpmi: Use 32 bit aligned address for debugfs mem write

[Srinivas Pandruvada]

The memory write feature supports 32-bit writes to any TPMI offset.
However, future hardware generations may not allow writes to non-32-bit
aligned addresses due to hardware optimizations.

Since all TPMI addresses are 64-bit aligned and correspond to 64-bit
registers, enforce 32-bit alignment for write operations.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
v2:
	Use IS_ALIGNED()
	Here <linux/align.h> is explicitly added, but also included in
	include chain of other included header files in this file.

 drivers/platform/x86/intel/vsec_tpmi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/platform/x86/intel/vsec_tpmi.c b/drivers/platform/x86/intel/vsec_tpmi.c
index 98846e88d3d0..b16968f76726 100644
--- a/drivers/platform/x86/intel/vsec_tpmi.c
+++ b/drivers/platform/x86/intel/vsec_tpmi.c
@@ -46,6 +46,7 @@
  * provided by the Intel VSEC driver.
  */
 
+#include <linux/align.h>
 #include <linux/auxiliary_bus.h>
 #include <linux/bitfield.h>
 #include <linux/debugfs.h>
@@ -479,6 +480,9 @@ static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t l
 	addr = array[2];
 	value = array[3];
 
+	if (!IS_ALIGNED(addr, sizeof(u32)))
+		return -EINVAL;
+
 	if (punit >= pfs->pfs_header.num_entries) {
 		ret = -EINVAL;
 		goto exit_write;
-- 
2.52.0