From: Valentina Manea Date: Sat, 8 Mar 2014 12:53:19 +0000 (+0200) Subject: staging: usbip: userspace: migrate usbip_bind to libudev X-Git-Tag: MMI-PSA29.97-13-9~12500^2~468 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1e94031973b076c9030cf66c4caab148839aebee;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git staging: usbip: userspace: migrate usbip_bind to libudev This patch adds autoconf check for libudev and migrates usbip_bind to the new library. libsysfs will still be used until all userspace is modified. Signed-off-by: Valentina Manea Reviewed-by: Shuah Khan Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/usbip/userspace/configure.ac b/drivers/staging/usbip/userspace/configure.ac index 0ee5d9263996..a5193c6c73f1 100644 --- a/drivers/staging/usbip/userspace/configure.ac +++ b/drivers/staging/usbip/userspace/configure.ac @@ -50,6 +50,12 @@ AC_CHECK_HEADER([sysfs/libsysfs.h], [AC_MSG_ERROR([Missing sysfs2 library!])])], [AC_MSG_ERROR([Missing /usr/include/sysfs/libsysfs.h])]) +AC_CHECK_HEADER([libudev.h], + [AC_CHECK_LIB([udev], [udev_new], + [LIBS="$LIBS -ludev"], + [AC_MSG_ERROR([Missing udev library!])])], + [AC_MSG_ERROR([Missing /usr/include/libudev.h])]) + # Checks for libwrap library. AC_MSG_CHECKING([whether to use the libwrap (TCP wrappers) library]) AC_ARG_WITH([tcp-wrappers], diff --git a/drivers/staging/usbip/userspace/libsrc/usbip_common.h b/drivers/staging/usbip/userspace/libsrc/usbip_common.h index 5af59d429114..d313e127d2ab 100644 --- a/drivers/staging/usbip/userspace/libsrc/usbip_common.h +++ b/drivers/staging/usbip/userspace/libsrc/usbip_common.h @@ -30,6 +30,15 @@ #define USBIP_HOST_DRV_NAME "usbip-host" #define USBIP_VHCI_DRV_NAME "vhci_hcd" +/* sysfs constants */ +#define SYSFS_MNT_PATH "/sys" +#define SYSFS_BUS_NAME "bus" +#define SYSFS_BUS_TYPE "usb" +#define SYSFS_DRIVERS_NAME "drivers" + +#define SYSFS_PATH_MAX 256 +#define SYSFS_BUS_ID_SIZE 32 + extern int usbip_use_syslog; extern int usbip_use_stderr; extern int usbip_use_debug ; diff --git a/drivers/staging/usbip/userspace/src/Makefile.am b/drivers/staging/usbip/userspace/src/Makefile.am index b4f8c4b04b2f..6c91bcb1e3bf 100644 --- a/drivers/staging/usbip/userspace/src/Makefile.am +++ b/drivers/staging/usbip/userspace/src/Makefile.am @@ -6,7 +6,8 @@ sbin_PROGRAMS := usbip usbipd usbip_SOURCES := usbip.h utils.h usbip.c utils.c usbip_network.c \ usbip_attach.c usbip_detach.c usbip_list.c \ - usbip_bind.c usbip_unbind.c usbip_port.c + usbip_bind.c usbip_unbind.c usbip_port.c \ + sysfs_utils.c usbipd_SOURCES := usbip_network.h usbipd.c usbip_network.c diff --git a/drivers/staging/usbip/userspace/src/sysfs_utils.c b/drivers/staging/usbip/userspace/src/sysfs_utils.c new file mode 100644 index 000000000000..36ac88ece0b8 --- /dev/null +++ b/drivers/staging/usbip/userspace/src/sysfs_utils.c @@ -0,0 +1,31 @@ +#include +#include +#include +#include + +#include "sysfs_utils.h" +#include "usbip_common.h" + +int write_sysfs_attribute(const char *attr_path, const char *new_value, + size_t len) +{ + int fd; + int length; + + fd = open(attr_path, O_WRONLY); + if (fd < 0) { + dbg("error opening attribute %s", attr_path); + return -1; + } + + length = write(fd, new_value, len); + if (length < 0) { + dbg("error writing to attribute %s", attr_path); + close(fd); + return -1; + } + + close(fd); + + return 0; +} diff --git a/drivers/staging/usbip/userspace/src/sysfs_utils.h b/drivers/staging/usbip/userspace/src/sysfs_utils.h new file mode 100644 index 000000000000..32ac1d105d18 --- /dev/null +++ b/drivers/staging/usbip/userspace/src/sysfs_utils.h @@ -0,0 +1,8 @@ + +#ifndef __SYSFS_UTILS_H +#define __SYSFS_UTILS_H + +int write_sysfs_attribute(const char *attr_path, const char *new_value, + size_t len); + +#endif diff --git a/drivers/staging/usbip/userspace/src/usbip_bind.c b/drivers/staging/usbip/userspace/src/usbip_bind.c index 8cfd2dbd9510..fa46141ae68b 100644 --- a/drivers/staging/usbip/userspace/src/usbip_bind.c +++ b/drivers/staging/usbip/userspace/src/usbip_bind.c @@ -16,7 +16,7 @@ * along with this program. If not, see . */ -#include +#include #include #include @@ -28,6 +28,7 @@ #include "usbip_common.h" #include "utils.h" #include "usbip.h" +#include "sysfs_utils.h" enum unbind_status { UNBIND_ST_OK, @@ -48,135 +49,92 @@ void usbip_bind_usage(void) /* call at unbound state */ static int bind_usbip(char *busid) { - char bus_type[] = "usb"; char attr_name[] = "bind"; - char sysfs_mntpath[SYSFS_PATH_MAX]; char bind_attr_path[SYSFS_PATH_MAX]; - struct sysfs_attribute *bind_attr; - int failed = 0; - int rc, ret = -1; - - rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX); - if (rc < 0) { - err("sysfs must be mounted: %s", strerror(errno)); - return -1; - } + int rc = -1; snprintf(bind_attr_path, sizeof(bind_attr_path), "%s/%s/%s/%s/%s/%s", - sysfs_mntpath, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME, - USBIP_HOST_DRV_NAME, attr_name); + SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE, + SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name); - bind_attr = sysfs_open_attribute(bind_attr_path); - if (!bind_attr) { - dbg("problem getting bind attribute: %s", strerror(errno)); - return -1; - } - - rc = sysfs_write_attribute(bind_attr, busid, SYSFS_BUS_ID_SIZE); + rc = write_sysfs_attribute(bind_attr_path, busid, strlen(busid)); if (rc < 0) { - dbg("bind driver at %s failed", busid); - failed = 1; + err("error binding device %s to driver: %s", busid, + strerror(errno)); + return -1; } - if (!failed) - ret = 0; - - sysfs_close_attribute(bind_attr); - - return ret; + return 0; } /* buggy driver may cause dead lock */ static int unbind_other(char *busid) { - char bus_type[] = "usb"; - struct sysfs_device *busid_dev; - struct sysfs_device *dev; - struct sysfs_driver *drv; - struct sysfs_attribute *unbind_attr; - struct sysfs_attribute *bDevClass; - int rc; enum unbind_status status = UNBIND_ST_OK; - busid_dev = sysfs_open_device(bus_type, busid); - if (!busid_dev) { - dbg("sysfs_open_device %s failed: %s", busid, strerror(errno)); - return -1; - } - dbg("busid path: %s", busid_dev->path); + char attr_name[] = "unbind"; + char unbind_attr_path[SYSFS_PATH_MAX]; + int rc = -1; - bDevClass = sysfs_get_device_attr(busid_dev, "bDeviceClass"); - if (!bDevClass) { - dbg("problem getting device attribute: %s", - strerror(errno)); + struct udev *udev; + struct udev_device *dev; + const char *driver; + const char *bDevClass; + + /* Create libudev context. */ + udev = udev_new(); + + /* Get the device. */ + dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid); + if (!dev) { + dbg("unable to find device with bus ID %s", busid); goto err_close_busid_dev; } - if (!strncmp(bDevClass->value, "09", bDevClass->len)) { - dbg("skip unbinding of hub"); + /* Check what kind of device it is. */ + bDevClass = udev_device_get_sysattr_value(dev, "bDeviceClass"); + if (!bDevClass) { + dbg("unable to get bDevClass device attribute"); goto err_close_busid_dev; } - dev = sysfs_open_device(bus_type, busid); - if (!dev) { - dbg("could not open device: %s", - strerror(errno)); + if (!strncmp(bDevClass, "09", strlen(bDevClass))) { + dbg("skip unbinding of hub"); goto err_close_busid_dev; } - dbg("%s -> %s", dev->name, dev->driver_name); - - if (!strncmp("unknown", dev->driver_name, SYSFS_NAME_LEN)) { - /* unbound interface */ - sysfs_close_device(dev); + /* Get the device driver. */ + driver = udev_device_get_driver(dev); + if (!driver) { + /* No driver bound to this device. */ goto out; } - if (!strncmp(USBIP_HOST_DRV_NAME, dev->driver_name, - SYSFS_NAME_LEN)) { - /* already bound to usbip-host */ + if (!strncmp(USBIP_HOST_DRV_NAME, driver, + strlen(USBIP_HOST_DRV_NAME))) { + /* Already bound to usbip-host. */ status = UNBIND_ST_USBIP_HOST; - sysfs_close_device(dev); goto out; } - /* unbinding */ - drv = sysfs_open_driver(bus_type, dev->driver_name); - if (!drv) { - dbg("could not open device driver on %s: %s", - dev->name, strerror(errno)); - goto err_close_intf_dev; - } - dbg("device driver: %s", drv->path); + /* Unbind device from driver. */ + snprintf(unbind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s", + SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE, + SYSFS_DRIVERS_NAME, driver, attr_name); - unbind_attr = sysfs_get_driver_attr(drv, "unbind"); - if (!unbind_attr) { - dbg("problem getting device driver attribute: %s", - strerror(errno)); - goto err_close_intf_drv; - } - - rc = sysfs_write_attribute(unbind_attr, dev->bus_id, - SYSFS_BUS_ID_SIZE); + rc = write_sysfs_attribute(unbind_attr_path, busid, strlen(busid)); if (rc < 0) { - /* NOTE: why keep unbinding other interfaces? */ - dbg("unbind driver at %s failed", dev->bus_id); - status = UNBIND_ST_FAILED; + err("error unbinding device %s from driver", busid); + goto err_close_busid_dev; } - sysfs_close_driver(drv); - sysfs_close_device(dev); - goto out; -err_close_intf_drv: - sysfs_close_driver(drv); -err_close_intf_dev: - sysfs_close_device(dev); err_close_busid_dev: status = UNBIND_ST_FAILED; out: - sysfs_close_device(busid_dev); + udev_device_unref(dev); + udev_unref(udev); return status; } @@ -184,6 +142,17 @@ out: static int bind_device(char *busid) { int rc; + struct udev *udev; + struct udev_device *dev; + + /* Check whether the device with this bus ID exists. */ + udev = udev_new(); + dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid); + if (!dev) { + err("device with the specified bus ID does not exist"); + return -1; + } + udev_unref(udev); rc = unbind_other(busid); if (rc == UNBIND_ST_FAILED) { @@ -208,7 +177,7 @@ static int bind_device(char *busid) return -1; } - printf("bind device on busid %s: complete\n", busid); + info("bind device on busid %s: complete", busid); return 0; } diff --git a/drivers/staging/usbip/userspace/src/utils.c b/drivers/staging/usbip/userspace/src/utils.c index 2d4966e6289c..2b3d6d235015 100644 --- a/drivers/staging/usbip/userspace/src/utils.c +++ b/drivers/staging/usbip/userspace/src/utils.c @@ -16,61 +16,37 @@ * along with this program. If not, see . */ -#include - #include #include #include #include "usbip_common.h" #include "utils.h" +#include "sysfs_utils.h" int modify_match_busid(char *busid, int add) { - char bus_type[] = "usb"; char attr_name[] = "match_busid"; - char buff[SYSFS_BUS_ID_SIZE + 4]; - char sysfs_mntpath[SYSFS_PATH_MAX]; + char command[SYSFS_BUS_ID_SIZE + 4]; char match_busid_attr_path[SYSFS_PATH_MAX]; - struct sysfs_attribute *match_busid_attr; - int rc, ret = 0; - - if (strnlen(busid, SYSFS_BUS_ID_SIZE) > SYSFS_BUS_ID_SIZE - 1) { - dbg("busid is too long"); - return -1; - } - - rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX); - if (rc < 0) { - err("sysfs must be mounted: %s", strerror(errno)); - return -1; - } + int rc; snprintf(match_busid_attr_path, sizeof(match_busid_attr_path), - "%s/%s/%s/%s/%s/%s", sysfs_mntpath, SYSFS_BUS_NAME, bus_type, - SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name); - - match_busid_attr = sysfs_open_attribute(match_busid_attr_path); - if (!match_busid_attr) { - dbg("problem getting match_busid attribute: %s", - strerror(errno)); - return -1; - } + "%s/%s/%s/%s/%s/%s", SYSFS_MNT_PATH, SYSFS_BUS_NAME, + SYSFS_BUS_TYPE, SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, + attr_name); if (add) - snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "add %s", busid); + snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s", busid); else - snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "del %s", busid); + snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s", busid); - dbg("write \"%s\" to %s", buff, match_busid_attr->path); - - rc = sysfs_write_attribute(match_busid_attr, buff, sizeof(buff)); + rc = write_sysfs_attribute(match_busid_attr_path, command, + sizeof(command)); if (rc < 0) { dbg("failed to write match_busid: %s", strerror(errno)); - ret = -1; + return -1; } - sysfs_close_attribute(match_busid_attr); - - return ret; + return 0; }