forked from Minki/linux
e9c18ae6eb
Waiting for release_event in all three drivers introduced issues on release as on_reset() hook is not always called. E.g. if the device was never opened we will never get the completion. Move the waiting code to hvutil_transport_destroy() and make sure it is only called when the device is open. hvt->lock serialization should guarantee the absence of races. Fixes:5a66fecbf6("Drivers: hv: util: kvp: Fix a rescind processing issue") Fixes:20951c7535("Drivers: hv: util: Fcopy: Fix a rescind processing issue") Fixes:d77044d142("Drivers: hv: util: Backup: Fix a rescind processing issue") Reported-by: Dexuan Cui <decui@microsoft.com> Tested-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
/*
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* Kernel/userspace transport abstraction for Hyper-V util driver.
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*
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* Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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*/
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#ifndef _HV_UTILS_TRANSPORT_H
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#define _HV_UTILS_TRANSPORT_H
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#include <linux/connector.h>
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#include <linux/miscdevice.h>
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enum hvutil_transport_mode {
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HVUTIL_TRANSPORT_INIT = 0,
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HVUTIL_TRANSPORT_NETLINK,
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HVUTIL_TRANSPORT_CHARDEV,
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HVUTIL_TRANSPORT_DESTROY,
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};
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struct hvutil_transport {
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int mode; /* hvutil_transport_mode */
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struct file_operations fops; /* file operations */
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struct miscdevice mdev; /* misc device */
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struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */
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struct list_head list; /* hvt_list */
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int (*on_msg)(void *, int); /* callback on new user message */
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void (*on_reset)(void); /* callback when userspace drops */
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void (*on_read)(void); /* callback on message read */
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u8 *outmsg; /* message to the userspace */
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int outmsg_len; /* its length */
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wait_queue_head_t outmsg_q; /* poll/read wait queue */
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struct mutex lock; /* protects struct members */
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struct completion release; /* synchronize with fd release */
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};
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struct hvutil_transport *hvutil_transport_init(const char *name,
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u32 cn_idx, u32 cn_val,
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int (*on_msg)(void *, int),
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void (*on_reset)(void));
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int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,
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void (*on_read_cb)(void));
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void hvutil_transport_destroy(struct hvutil_transport *hvt);
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#endif /* _HV_UTILS_TRANSPORT_H */
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