linux-kernel - [PATCH 21/24] usb: host: xhci: Move array of structs from the stack onto the heap

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Date:   Wed, 26 May 2021 14:00:34 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: [PATCH 21/24] usb: host: xhci: Move array of structs from the stack onto the heap

Fixes the following W=1 kernel build warning(s):

 drivers/usb/host/xhci.c: In function ‘xhci_reserve_bandwidth’:
 drivers/usb/host/xhci.c:2859:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Cc: Mathias Nyman <mathias.nyman@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/usb/host/xhci.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index ac2a7d4288883..40ce4b4eb12ad 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2773,7 +2773,7 @@ static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
 		struct xhci_virt_device *virt_dev,
 		struct xhci_container_ctx *in_ctx)
 {
-	struct xhci_bw_info ep_bw_info[31];
+	struct xhci_bw_info *ep_bw_info;
 	int i;
 	struct xhci_input_control_ctx *ctrl_ctx;
 	int old_active_eps = 0;
@@ -2788,6 +2788,10 @@ static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
 		return -ENOMEM;
 	}
 
+	ep_bw_info = kzalloc(sizeof(*ep_bw_info) * 31, GFP_KERNEL);
+	if (!ep_bw_info)
+		return -ENOMEM;
+
 	for (i = 0; i < 31; i++) {
 		if (!EP_IS_ADDED(ctrl_ctx, i) && !EP_IS_DROPPED(ctrl_ctx, i))
 			continue;
@@ -2824,6 +2828,7 @@ static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
 		 * Update the number of active TTs.
 		 */
 		xhci_update_tt_active_eps(xhci, virt_dev, old_active_eps);
+		kfree(ep_bw_info);
 		return 0;
 	}
 
@@ -2855,6 +2860,7 @@ static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
 					&virt_dev->eps[i],
 					virt_dev->tt_info);
 	}
+	kfree(ep_bw_info);
 	return -ENOMEM;
 }
 
-- 
2.31.1