V4L/DVB: firedtv: do not DMA-map stack addresses

This is a portability fix and reduces stack usage.

The DMA mapping API cannot map on-stack addresses, as explained in
Documentation/DMA-mapping.txt.  Convert the two cases of on-stack packet
payload buffers in firedtv (payload of write requests in avc_write and
of lock requests in cmp_lock) to slab-allocated memory.

We use the 512 bytes sized FCP frame buffer in struct firedtv for this
purpose.  Previously it held only incoming FCP responses, now it holds
pending FCP requests and is then overwriten by an FCP response from the
tuner subunit.  Ditto for CMP lock requests and responses.  Accesses to
the payload buffer are serialized by fdtv->avc_mutex.

As a welcome side effect, stack usage of the AV/C transaction functions
is reduced by 512 bytes.

Alas, avc_register_remote_control() is a special case:  It previously
did not wait for a response.  To fit better in with the other FCP
transactions, let it wait for an interim response.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/media/dvb/firewire/firedtv.h b/drivers/media/dvb/firewire/firedtv.h
index 35080dbb3c66..78cc28f36914 100644
--- a/drivers/media/dvb/firewire/firedtv.h
+++ b/drivers/media/dvb/firewire/firedtv.h
@@ -73,7 +73,7 @@ struct input_dev;
 struct firedtv;
 
 struct firedtv_backend {
-        int (*lock)(struct firedtv *fdtv, u64 addr, __be32 data[]);
+        int (*lock)(struct firedtv *fdtv, u64 addr, void *data);
         int (*read)(struct firedtv *fdtv, u64 addr, void *data);
         int (*write)(struct firedtv *fdtv, u64 addr, void *data, size_t len);
         int (*start_iso)(struct firedtv *fdtv);
@@ -114,8 +114,8 @@ struct firedtv {
         unsigned long           channel_active;
         u16                     channel_pid[16];
 
-        size_t                  response_length;
-        u8                      response[512];
+        int                     avc_data_length;
+        u8                      avc_data[512];
 };
 
 /* firedtv-1394.c */