linux-kernel - [PATCH] scsi: st: replace ternary operator with min() or max()

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Date:   Mon, 11 Jul 2022 16:37:53 +0800
From:   Jiangshan Yi <13667453960@....com>
To:     Kai.Makisara@...umbus.fi, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiangshan Yi <yijiangshan@...inos.cn>
Subject: [PATCH] scsi: st: replace ternary operator with min() or max()

From: Jiangshan Yi <yijiangshan@...inos.cn>

Fix the following coccicheck warning:

drivers/scsi/st.c:1575: WARNING opportunity for max().
drivers/scsi/st.c:2187: WARNING opportunity for min().
drivers/scsi/st.c:3997: WARNING opportunity for min().
drivers/scsi/st.c:4029: WARNING opportunity for min().

min() and max() macro is defined in include/linux/minmax.h. It avoids
multiple evaluations of the arguments when non-constant and performs
strict type-checking.

Signed-off-by: Jiangshan Yi <yijiangshan@...inos.cn>
---
 drivers/scsi/st.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 850172a2b8f1..9555988fa78e 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -1572,8 +1572,7 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
 
 	if (!STbp->do_dio) {
 		if (STp->block_size)
-			bufsize = STp->block_size > st_fixed_buffer_size ?
-				STp->block_size : st_fixed_buffer_size;
+			bufsize = max(STp->block_size, st_fixed_buffer_size);
 		else {
 			bufsize = count;
 			/* Make sure that data from previous user is not leaked even if
@@ -2184,8 +2183,7 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 					  STps->eof, STbp->buffer_bytes,
 					  (int)(count - total));
 			) /* end DEB */
-			transfer = STbp->buffer_bytes < count - total ?
-			    STbp->buffer_bytes : count - total;
+			transfer = min((size_t)STbp->buffer_bytes, count - total);
 			if (!do_dio) {
 				i = from_buffer(STbp, buf, transfer);
 				if (i) {
@@ -3994,7 +3992,7 @@ static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, in
 	}
 	for (; i < st_bp->frp_segs && do_count > 0; i++) {
 		struct page *page = st_bp->reserved_pages[i];
-		cnt = length - offset < do_count ? length - offset : do_count;
+		cnt = min(length - offset, do_count);
 		res = copy_from_user(page_address(page) + offset, ubp, cnt);
 		if (res)
 			return (-EFAULT);
@@ -4026,7 +4024,7 @@ static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
 	}
 	for (; i < st_bp->frp_segs && do_count > 0; i++) {
 		struct page *page = st_bp->reserved_pages[i];
-		cnt = length - offset < do_count ? length - offset : do_count;
+		cnt = min(length - offset, do_count);
 		res = copy_to_user(ubp, page_address(page) + offset, cnt);
 		if (res)
 			return (-EFAULT);
-- 
2.25.1