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authorPantelis Koukousoulas <pakt223@freemail.gr>2006-12-27 23:08:55 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-02-21 13:34:23 -0200
commit99cfdf5cc6dbe0bd748d810953874d4e08051a9f (patch)
treecec9345ab6f19e26711d20e0642956bed8fccd20 /drivers/media/video
parent2fdf3d9c94f7f752dacbebb75bbecda3c1b082a0 (diff)
V4L/DVB (5038): Pvrusb2: Implement stream claim checking function
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>
Diffstat (limited to 'drivers/media/video')
-rw-r--r--drivers/media/video/pvrusb2/pvrusb2-context.c11
-rw-r--r--drivers/media/video/pvrusb2/pvrusb2-context.h2
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/video/pvrusb2/pvrusb2-context.c b/drivers/media/video/pvrusb2/pvrusb2-context.c
index cf129746205..69786cdaa85 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-context.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-context.c
@@ -188,6 +188,17 @@ void pvr2_channel_done(struct pvr2_channel *cp)
}
+int pvr2_channel_check_stream_no_lock(struct pvr2_channel *cp,
+ struct pvr2_context_stream *sp)
+{
+ if (sp == cp->stream) return 0;
+ if (sp->user) {
+ return -EBUSY;
+ }
+ return 0;
+}
+
+
int pvr2_channel_claim_stream(struct pvr2_channel *cp,
struct pvr2_context_stream *sp)
{
diff --git a/drivers/media/video/pvrusb2/pvrusb2-context.h b/drivers/media/video/pvrusb2/pvrusb2-context.h
index 6327fa1f7e4..4d0f4ad6412 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-context.h
+++ b/drivers/media/video/pvrusb2/pvrusb2-context.h
@@ -76,6 +76,8 @@ void pvr2_channel_init(struct pvr2_channel *,struct pvr2_context *);
void pvr2_channel_done(struct pvr2_channel *);
int pvr2_channel_claim_stream(struct pvr2_channel *,
struct pvr2_context_stream *);
+int pvr2_channel_check_stream_no_lock(struct pvr2_channel *,
+ struct pvr2_context_stream *);
struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
struct pvr2_context_stream *);