linux-kernel - [PATCH v2] usbip: dynamically allocate idev by nports found in sysfs

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Date:   Tue, 22 May 2018 19:04:07 +0200
From:   Michael Grzeschik <m.grzeschik@...gutronix.de>
To:     shuah@...nel.org, linux-usb@...r.kernel.org
Cc:     valentina.manea.m@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH v2] usbip: dynamically allocate idev by nports found in sysfs

As the amount of available ports varies by the kernels build
configuration. To remove the limitation of the fixed 128 ports
we allocate the amount of idevs by using the number we get
from the kernel.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
v1 -> v2: - reworked memory allocation into one calloc call
          - added error path on allocation failure

 tools/usb/usbip/libsrc/vhci_driver.c | 14 +++++++++-----
 tools/usb/usbip/libsrc/vhci_driver.h |  3 +--
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/tools/usb/usbip/libsrc/vhci_driver.c b/tools/usb/usbip/libsrc/vhci_driver.c
index c9c81614a66ad..6e2a9edfd1f0d 100644
--- a/tools/usb/usbip/libsrc/vhci_driver.c
+++ b/tools/usb/usbip/libsrc/vhci_driver.c
@@ -242,13 +242,20 @@ static int read_record(int rhport, char *host, unsigned long host_len,
 
 int usbip_vhci_driver_open(void)
 {
+	int nports = get_nports();
+
 	udev_context = udev_new();
 	if (!udev_context) {
 		err("udev_new failed");
 		return -1;
 	}
 
-	vhci_driver = calloc(1, sizeof(struct usbip_vhci_driver));
+	vhci_driver = calloc(1, sizeof(struct usbip_vhci_driver) +
+			nports * sizeof(struct usbip_imported_device));
+	if (!vhci_driver) {
+		err("vhci_driver allocation failed");
+		return -1;
+	}
 
 	/* will be freed in usbip_driver_close() */
 	vhci_driver->hc_device =
@@ -260,15 +267,12 @@ int usbip_vhci_driver_open(void)
 		goto err;
 	}
 
-	vhci_driver->nports = get_nports();
+	vhci_driver->nports = nports;
 	dbg("available ports: %d", vhci_driver->nports);
 
 	if (vhci_driver->nports <= 0) {
 		err("no available ports");
 		goto err;
-	} else if (vhci_driver->nports > MAXNPORT) {
-		err("port number exceeds %d", MAXNPORT);
-		goto err;
 	}
 
 	vhci_driver->ncontrollers = get_ncontrollers();
diff --git a/tools/usb/usbip/libsrc/vhci_driver.h b/tools/usb/usbip/libsrc/vhci_driver.h
index 418b404d51210..6c9aca2167051 100644
--- a/tools/usb/usbip/libsrc/vhci_driver.h
+++ b/tools/usb/usbip/libsrc/vhci_driver.h
@@ -13,7 +13,6 @@
 
 #define USBIP_VHCI_BUS_TYPE "platform"
 #define USBIP_VHCI_DEVICE_NAME "vhci_hcd.0"
-#define MAXNPORT 128
 
 enum hub_speed {
 	HUB_SPEED_HIGH = 0,
@@ -41,7 +40,7 @@ struct usbip_vhci_driver {
 
 	int ncontrollers;
 	int nports;
-	struct usbip_imported_device idev[MAXNPORT];
+	struct usbip_imported_device idev[];
 };
 
 
-- 
2.17.0