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99cfdf5cc6
Add (and expose) a new function, pvr2_channel_check_stream_no_lock(), in
pvrusb2-context.c. This is hopefully the last V4L2 interface related patch
to change anything outside pvrusb2-v4l2.c.
We need this to implement the open() for the radio device. The reason is
that within the *enter_context() section of open() we need to ensure nobody
is streaming and if we cannot, we should cleanup after ourselves and return
-EBUSY. We cannot just use claim_stream() because:
1) That would cause a deadlock trying to re-acquire the context lock
2) We only need to ensure that nobody is streaming. We don't need to
actually acquire the stream.
Again, this is a kinda ugly patch. Feel free to improve.
Signed-off-by: Pantelis Koukousoulas <pakt223@freemail.gr>
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/*
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* $Id$
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*
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* Copyright (C) 2005 Mike Isely <isely@pobox.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __PVRUSB2_BASE_H
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#define __PVRUSB2_BASE_H
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#include <linux/mutex.h>
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#include <linux/usb.h>
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#include <linux/workqueue.h>
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struct pvr2_hdw; /* hardware interface - defined elsewhere */
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struct pvr2_stream; /* stream interface - defined elsewhere */
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struct pvr2_context; /* All central state */
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struct pvr2_channel; /* One I/O pathway to a user */
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struct pvr2_context_stream; /* Wrapper for a stream */
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struct pvr2_crit_reg; /* Critical region pointer */
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struct pvr2_ioread; /* Low level stream structure */
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struct pvr2_context_stream {
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struct pvr2_channel *user;
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struct pvr2_stream *stream;
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};
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struct pvr2_context {
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struct pvr2_channel *mc_first;
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struct pvr2_channel *mc_last;
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struct pvr2_hdw *hdw;
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struct pvr2_context_stream video_stream;
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struct mutex mutex;
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int disconnect_flag;
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/* Called after pvr2_context initialization is complete */
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void (*setup_func)(struct pvr2_context *);
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/* Work queue overhead for out-of-line processing */
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struct workqueue_struct *workqueue;
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struct work_struct workinit;
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struct work_struct workpoll;
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};
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struct pvr2_channel {
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struct pvr2_context *mc_head;
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struct pvr2_channel *mc_next;
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struct pvr2_channel *mc_prev;
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struct pvr2_context_stream *stream;
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struct pvr2_hdw *hdw;
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void (*check_func)(struct pvr2_channel *);
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};
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void pvr2_context_enter(struct pvr2_context *);
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void pvr2_context_exit(struct pvr2_context *);
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struct pvr2_context *pvr2_context_create(struct usb_interface *intf,
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const struct usb_device_id *devid,
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void (*setup_func)(struct pvr2_context *));
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void pvr2_context_disconnect(struct pvr2_context *);
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void pvr2_channel_init(struct pvr2_channel *,struct pvr2_context *);
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void pvr2_channel_done(struct pvr2_channel *);
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int pvr2_channel_claim_stream(struct pvr2_channel *,
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struct pvr2_context_stream *);
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int pvr2_channel_check_stream_no_lock(struct pvr2_channel *,
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struct pvr2_context_stream *);
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struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
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struct pvr2_context_stream *);
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#endif /* __PVRUSB2_CONTEXT_H */
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/*
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Stuff for Emacs to see, in order to encourage consistent editing style:
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*** Local Variables: ***
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*** mode: c ***
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*** fill-column: 75 ***
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*** tab-width: 8 ***
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*** c-basic-offset: 8 ***
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*** End: ***
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*/
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