linux-kernel - [PATCH] scsi: st: Use min/max helpers for comparison and assignment

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Message-ID: <Y9TVuM1az7ajhTlS@ubun2204.myguest.virtualbox.org>
Date:   Sat, 28 Jan 2023 13:28:48 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     Kai Mäkisara <Kai.Makisara@...umbus.fi>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>,
        Deepak R Varma <drv@...lo.com>
Subject: [PATCH] scsi: st: Use min/max helpers for comparison and assignment

Simplify code by using min_t helper macro for logical evaluation
and value assignment. Use the _t variant of min macro since the
variable types are not same.
This issue is identified by coccicheck using the minmax.cocci file.

Signed-off-by: Deepak R Varma <drv@...lo.com>
---
Please note: Proposed change is only compile/build tested.

 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 b90a440e135d..38aa59cba110 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -1574,8 +1574,7 @@ 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
@@ -2186,8 +2185,7 @@ 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_t(size_t, STbp->buffer_bytes, (count - total));
 			if (!do_dio) {
 				i = from_buffer(STbp, buf, transfer);
 				if (i) {
@@ -3996,7 +3994,7 @@ 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);
@@ -4028,7 +4026,7 @@ 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);
-- 
2.34.1