linux-kernel - [PATCH] usb: hcd: add a flag for whether using shared

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Date:   Thu, 7 Apr 2022 10:45:14 +0800
From:   Tao Wang <quic_wat@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
CC:     <quic_wat@...cinc.com>, <quic_linyyuan@...cinc.com>
Subject: [PATCH] usb: hcd: add a flag for whether using shared_hcd priv

The shared_hcd->hcd_priv is not used in xhci, so not
need to malloc hcd priv memory for shared_hcd.

This change add a shared_hcd_no_priv flag to indicate
if shared_hcd use priv, and set the flag of xhci to 1.

Signed-off-by: Tao Wang <quic_wat@...cinc.com>
---
 drivers/usb/core/hcd.c       | 6 +++++-
 drivers/usb/host/xhci-plat.c | 1 +
 include/linux/usb/hcd.h      | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 99908d8..f339c3e 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2419,7 +2419,11 @@ struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
 {
 	struct usb_hcd *hcd;
 
-	hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
+	if (primary_hcd && driver->shared_hcd_no_priv)
+		hcd = kzalloc(sizeof(*hcd), GFP_KERNEL);
+	else
+		hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
+
 	if (!hcd)
 		return NULL;
 	if (primary_hcd == NULL) {
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 21280a6..223e508 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -236,6 +236,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	driver = &xhci_plat_hc_driver;
+	driver->shared_hcd_no_priv = 1;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 2ffafbd..03ac312 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -256,6 +256,7 @@ struct hc_driver {
 	const char	*description;	/* "ehci-hcd" etc */
 	const char	*product_desc;	/* product/vendor string */
 	size_t		hcd_priv_size;	/* size of private data */
+	bool		shared_hcd_no_priv;	/* 0 use priv, 1 not use priv*/
 
 	/* irq handler */
 	irqreturn_t	(*irq) (struct usb_hcd *hcd);
-- 
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