linux-kernel - [PATCH net-next v1 1/1] tg3: Increase buffer size for IRQ label

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Message-ID: <20241014103810.4015718-1-andriy.shevchenko@linux.intel.com>
Date: Mon, 14 Oct 2024 13:38:10 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH net-next v1 1/1] tg3: Increase buffer size for IRQ label

GCC is not happy with the current code, e.g.:

.../tg3.c:11313:37: error: ‘-txrx-’ directive output may be truncated writing 6 bytes into a region of size between 1 and 16 [-Werror=format-truncation=]
11313 |                                  "%s-txrx-%d", tp->dev->name, irq_num);
      |                                     ^~~~~~
.../tg3.c:11313:34: note: using the range [-2147483648, 2147483647] for directive argument
11313 |                                  "%s-txrx-%d", tp->dev->name, irq_num);

When `make W=1` is supplied, this prevents kernel building. Fix it by
increasing the buffer size for IRQ label and use sizeoF() instead of
hard coded constants.

While at it, move the respective buffer out from the structure as
it's used only in one caller. This also improves memory footprint
of struct tg3_napi.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/net/ethernet/broadcom/tg3.c | 12 ++++++------
 drivers/net/ethernet/broadcom/tg3.h |  1 -
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 378815917741..b5a2f0e2855e 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -11299,6 +11299,7 @@ static void tg3_reset_task(struct work_struct *work)
 
 static int tg3_request_irq(struct tg3 *tp, int irq_num)
 {
+	char irq_lbl[IFNAMSIZ + 6 + 10]; /* name + "-txrx-" + %d */
 	irq_handler_t fn;
 	unsigned long flags;
 	char *name;
@@ -11307,20 +11308,19 @@ static int tg3_request_irq(struct tg3 *tp, int irq_num)
 	if (tp->irq_cnt == 1)
 		name = tp->dev->name;
 	else {
-		name = &tnapi->irq_lbl[0];
+		name = &irq_lbl[0];
 		if (tnapi->tx_buffers && tnapi->rx_rcb)
-			snprintf(name, IFNAMSIZ,
+			snprintf(name, sizeof(irq_lbl),
 				 "%s-txrx-%d", tp->dev->name, irq_num);
 		else if (tnapi->tx_buffers)
-			snprintf(name, IFNAMSIZ,
+			snprintf(name, sizeof(irq_lbl),
 				 "%s-tx-%d", tp->dev->name, irq_num);
 		else if (tnapi->rx_rcb)
-			snprintf(name, IFNAMSIZ,
+			snprintf(name, sizeof(irq_lbl),
 				 "%s-rx-%d", tp->dev->name, irq_num);
 		else
-			snprintf(name, IFNAMSIZ,
+			snprintf(name, sizeof(irq_lbl),
 				 "%s-%d", tp->dev->name, irq_num);
-		name[IFNAMSIZ-1] = 0;
 	}
 
 	if (tg3_flag(tp, USING_MSI) || tg3_flag(tp, USING_MSIX)) {
diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index cf1b2b123c7e..2c5d1eee8068 100644
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -3033,7 +3033,6 @@ struct tg3_napi {
 	dma_addr_t			rx_rcb_mapping;
 	dma_addr_t			tx_desc_mapping;
 
-	char				irq_lbl[IFNAMSIZ];
 	unsigned int			irq_vec;
 };
 
-- 
2.43.0.rc1.1336.g36b5255a03ac