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authorBjørn Mork <bjorn@mork.no>2012-05-09 13:53:22 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-11 15:19:22 -0700
commit6b0b79d38806481c1c8fffa7c5842f3c83679a42 (patch)
treea245e513829756b11694ced5a7ba1fb5dee38b67 /drivers/usb/class/cdc-wdm.c
parent616b6937e348ef2b4c6ea5fef2cd3c441145efb0 (diff)
downloadlinux-6b0b79d38806481c1c8fffa7c5842f3c83679a42.tar.bz2
USB: cdc-wdm: cannot use dev_printk when device is gone
We cannot dereference a removed USB interface for dev_printk. Use pr_debug instead where necessary. Flush errors are expected if device is unplugged and are therefore best ingored at this point. Move the kill_urbs() call in wdm_release with dev_dbg() for the non disconnect, as we know it has already been called if WDM_DISCONNECTING is set. This does not actually fix anything, but keeps the code more consistent. Cc: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@vger.kernel.org> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/cdc-wdm.c')
-rw-r--r--drivers/usb/class/cdc-wdm.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 765227575d3b..90bc916d7cbd 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -533,7 +533,9 @@ static int wdm_flush(struct file *file, fl_owner_t id)
struct wdm_device *desc = file->private_data;
wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
- if (desc->werr < 0)
+
+ /* cannot dereference desc->intf if WDM_DISCONNECTING */
+ if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags))
dev_err(&desc->intf->dev, "Error in flush path: %d\n",
desc->werr);
@@ -625,12 +627,13 @@ static int wdm_release(struct inode *inode, struct file *file)
mutex_unlock(&desc->wlock);
if (!desc->count) {
- dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
- kill_urbs(desc);
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
+ dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
+ kill_urbs(desc);
desc->manage_power(desc->intf, 0);
} else {
- dev_dbg(&desc->intf->dev, "%s: device gone - cleaning up\n", __func__);
+ /* must avoid dev_printk here as desc->intf is invalid */
+ pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__);
cleanup(desc);
}
}