usb: usbip tool: Add ncontrollers in vhci_driver structure
A new field ncontrollers is added to the vhci_driver structure.
And this field is stored by scanning the vhci_hcd* dirs in the
platform udev.
Suggested-and-reviewed-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Yuyang Du <yuyang.du@intel.com>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/tools/usb/usbip/libsrc/vhci_driver.c b/tools/usb/usbip/libsrc/vhci_driver.c
index 036b62b..f6f3a19 100644
--- a/tools/usb/usbip/libsrc/vhci_driver.c
+++ b/tools/usb/usbip/libsrc/vhci_driver.c
@@ -7,6 +7,7 @@
#include <limits.h>
#include <netdb.h>
#include <libudev.h>
+#include <dirent.h>
#include "sysfs_utils.h"
#undef PROGNAME
@@ -134,6 +135,33 @@
return (int)strtoul(attr_nports, NULL, 10);
}
+static int vhci_hcd_filter(const struct dirent *dirent)
+{
+ return strcmp(dirent->d_name, "vhci_hcd") >= 0;
+}
+
+static int get_ncontrollers(void)
+{
+ struct dirent **namelist;
+ struct udev_device *platform;
+ int n;
+
+ platform = udev_device_get_parent(vhci_driver->hc_device);
+ if (platform == NULL)
+ return -1;
+
+ n = scandir(udev_device_get_syspath(platform), &namelist, vhci_hcd_filter, NULL);
+ if (n < 0)
+ err("scandir failed");
+ else {
+ for (int i = 0; i < n; i++)
+ free(namelist[i]);
+ free(namelist);
+ }
+
+ return n;
+}
+
/*
* Read the given port's record.
*
@@ -230,6 +258,14 @@
goto err;
}
+ vhci_driver->ncontrollers = get_ncontrollers();
+ dbg("available controllers: %d", vhci_driver->ncontrollers);
+
+ if (vhci_driver->ncontrollers <=0) {
+ err("no available usb controllers");
+ goto err;
+ }
+
if (refresh_imported_device_list())
goto err;
diff --git a/tools/usb/usbip/libsrc/vhci_driver.h b/tools/usb/usbip/libsrc/vhci_driver.h
index fa2316c..33add14 100644
--- a/tools/usb/usbip/libsrc/vhci_driver.h
+++ b/tools/usb/usbip/libsrc/vhci_driver.h
@@ -31,6 +31,7 @@
/* /sys/devices/platform/vhci_hcd */
struct udev_device *hc_device;
+ int ncontrollers;
int nports;
struct usbip_imported_device idev[MAXNPORT];
};