From: Max Vozeler <[email protected]> vhci_rx/vhci_tx threads are created once but stopped each time the vdev is shut down. On subsequent attach wake_up_process() oopses trying to access the stopped threads.
This patch does as before the kthread conversion which is to create the threads each time a device is attached and stop the threads when the device is shut down. Signed-off-by: Max Vozeler <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Takahiro Hirofuchi <[email protected]> Cc: Arjan Mels <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/staging/usbip/vhci_hcd.c | 9 ++++----- drivers/staging/usbip/vhci_sysfs.c | 7 ++++--- 2 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c index 0f02a4b..14caae2 100644 --- a/drivers/staging/usbip/vhci_hcd.c +++ b/drivers/staging/usbip/vhci_hcd.c @@ -876,8 +876,10 @@ static void vhci_shutdown_connection(struct usbip_device *ud) } /* kill threads related to this sdev, if v.c. exists */ - kthread_stop(vdev->ud.tcp_rx); - kthread_stop(vdev->ud.tcp_tx); + if (vdev->ud.tcp_rx) + kthread_stop(vdev->ud.tcp_rx); + if (vdev->ud.tcp_tx) + kthread_stop(vdev->ud.tcp_tx); usbip_uinfo("stop threads\n"); @@ -949,9 +951,6 @@ static void vhci_device_init(struct vhci_device *vdev) { memset(vdev, 0, sizeof(*vdev)); - vdev->ud.tcp_rx = kthread_create(vhci_rx_loop, &vdev->ud, "vhci_rx"); - vdev->ud.tcp_tx = kthread_create(vhci_tx_loop, &vdev->ud, "vhci_tx"); - vdev->ud.side = USBIP_VHCI; vdev->ud.status = VDEV_ST_NULL; /* vdev->ud.lock = SPIN_LOCK_UNLOCKED; */ diff --git a/drivers/staging/usbip/vhci_sysfs.c b/drivers/staging/usbip/vhci_sysfs.c index 3f2459f..e2dadbd 100644 --- a/drivers/staging/usbip/vhci_sysfs.c +++ b/drivers/staging/usbip/vhci_sysfs.c @@ -21,6 +21,7 @@ #include "vhci.h" #include <linux/in.h> +#include <linux/kthread.h> /* TODO: refine locking ?*/ @@ -220,13 +221,13 @@ static ssize_t store_attach(struct device *dev, struct device_attribute *attr, vdev->ud.tcp_socket = socket; vdev->ud.status = VDEV_ST_NOTASSIGNED; - wake_up_process(vdev->ud.tcp_rx); - wake_up_process(vdev->ud.tcp_tx); - spin_unlock(&vdev->ud.lock); spin_unlock(&the_controller->lock); /* end the lock */ + vdev->ud.tcp_rx = kthread_run(vhci_rx_loop, &vdev->ud, "vhci_rx"); + vdev->ud.tcp_tx = kthread_run(vhci_tx_loop, &vdev->ud, "vhci_tx"); + rh_port_connect(rhport, speed); return count; -- 1.7.4.2 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
