[PATCH v2] tpm: Replace scnprintf() with sysfs_emit() and sysfs_emit_at() in sysfs show functions

[Chelsy Ratnawat]

Replace calls to scnprintf() with sysfs_emit() and sysfs_emit_at() in
sysfs show functions. These helpers are preferred in sysfs callbacks
because they automatically handle buffer sizing (PAGE_SIZE) and
improve safety and readability.

Signed-off-by: Chelsy Ratnawat <chelsyratnawat2...@gmail.com>
---
Changes in v2: 
- Corrected sysfs_emit_at() usage to pass buf as first argument

 drivers/char/tpm/tpm_ppi.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
index bc7b1b4501b3..2c0d1859284d 100644
--- a/drivers/char/tpm/tpm_ppi.c
+++ b/drivers/char/tpm/tpm_ppi.c
@@ -52,7 +52,7 @@ static ssize_t tpm_show_ppi_version(struct device *dev,
 {
        struct tpm_chip *chip = to_tpm_chip(dev);
 
-       return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
+       return sysfs_emit(buf, "%s\n", chip->ppi_version);
 }
 
 static ssize_t tpm_show_ppi_request(struct device *dev,
@@ -87,11 +87,11 @@ static ssize_t tpm_show_ppi_request(struct device *dev,
                else {
                        req = obj->package.elements[1].integer.value;
                        if (tpm_ppi_req_has_parameter(req))
-                               size = scnprintf(buf, PAGE_SIZE,
+                               size = sysfs_emit(buf,
                                    "%llu %llu\n", req,
                                    obj->package.elements[2].integer.value);
                        else
-                               size = scnprintf(buf, PAGE_SIZE,
+                               size = sysfs_emit(buf,
                                                "%llu\n", req);
                }
        } else if (obj->package.count == 2 &&
@@ -100,7 +100,7 @@ static ssize_t tpm_show_ppi_request(struct device *dev,
                if (obj->package.elements[0].integer.value)
                        size = -EFAULT;
                else
-                       size = scnprintf(buf, PAGE_SIZE, "%llu\n",
+                       size = sysfs_emit(buf, "%llu\n",
                                 obj->package.elements[1].integer.value);
        }
 
@@ -211,9 +211,9 @@ static ssize_t tpm_show_ppi_transition_action(struct device 
*dev,
        }
 
        if (ret < ARRAY_SIZE(info) - 1)
-               status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
+               status = sysfs_emit(buf, "%d: %s\n", ret, info[ret]);
        else
-               status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
+               status = sysfs_emit(buf, "%d: %s\n", ret,
                                   info[ARRAY_SIZE(info)-1]);
        return status;
 }
@@ -255,22 +255,22 @@ static ssize_t tpm_show_ppi_response(struct device *dev,
        res = ret_obj[2].integer.value;
        if (req) {
                if (res == 0)
-                       status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
+                       status = sysfs_emit(buf, "%llu %s\n", req,
                                           "0: Success");
                else if (res == 0xFFFFFFF0)
-                       status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
+                       status = sysfs_emit(buf, "%llu %s\n", req,
                                           "0xFFFFFFF0: User Abort");
                else if (res == 0xFFFFFFF1)
-                       status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
+                       status = sysfs_emit(buf, "%llu %s\n", req,
                                           "0xFFFFFFF1: BIOS Failure");
                else if (res >= 1 && res <= 0x00000FFF)
-                       status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
+                       status = sysfs_emit(buf, "%llu %llu: %s\n",
                                           req, res, "Corresponding TPM error");
                else
-                       status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
+                       status = sysfs_emit(buf, "%llu %llu: %s\n",
                                           req, res, "Error");
        } else {
-               status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
+               status = sysfs_emit(buf, "%llu: %s\n",
                                   req, "No Recent Request");
        }
 
@@ -314,7 +314,7 @@ static ssize_t show_ppi_operations(acpi_handle dev_handle, 
char *buf, u32 start,
                }
 
                if (ret > 0 && ret < ARRAY_SIZE(info))
-                       str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
+                       str += sysfs_emit_at(buf, str - buf, "%d %d: %s\n",
                                         i, ret, info[ret]);
        }
 
-- 
2.47.1