V4L/DVB (13398): firedtv: reform lock transaction backend call

Preparation for the port of firedtv to the firewire-core kernel API:
The fdtv->backend->lock() hook and thus the CMP code is slightly changed
to better fit with the new API.

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

3 files changed, 37 insertions, 26 deletions

diff --git a/drivers/media/dvb/firewire/firedtv-1394.c b/drivers/media/dvb/firewire/firedtv-1394.c
index a2e3841f8ee..22ea4c90f5c 100644
--- a/drivers/media/dvb/firewire/firedtv-1394.c
+++ b/drivers/media/dvb/firewire/firedtv-1394.c
@@ -87,10 +87,15 @@ static inline struct node_entry *node_of(struct firedtv *fdtv)
         return container_of(fdtv->device, struct unit_directory, device)->ne;
 }
 
-static int node_lock(struct firedtv *fdtv, u64 addr, void *data, __be32 arg)
+static int node_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
 {
-        return hpsb_node_lock(node_of(fdtv), addr, EXTCODE_COMPARE_SWAP, data,
-                              (__force quadlet_t)arg);
+        int ret;
+
+        ret = hpsb_node_lock(node_of(fdtv), addr, EXTCODE_COMPARE_SWAP,
+                (__force quadlet_t *)&data[1], (__force quadlet_t)data[0]);
+        data[0] = data[1];
+
+        return ret;
 }
 
 static int node_read(struct firedtv *fdtv, u64 addr, void *data, size_t len)
diff --git a/drivers/media/dvb/firewire/firedtv-avc.c b/drivers/media/dvb/firewire/firedtv-avc.c
index 485d061319a..5516c33b145 100644
--- a/drivers/media/dvb/firewire/firedtv-avc.c
+++ b/drivers/media/dvb/firewire/firedtv-avc.c
@@ -1251,14 +1251,14 @@ static int cmp_read(struct firedtv *fdtv, void *buf, u64 addr, size_t len)
         return ret;
 }
 
-static int cmp_lock(struct firedtv *fdtv, void *data, u64 addr, __be32 arg)
+static int cmp_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
 {
         int ret;
 
         if (mutex_lock_interruptible(&fdtv->avc_mutex))
                 return -EINTR;
 
-        ret = fdtv->backend->lock(fdtv, addr, data, arg);
+        ret = fdtv->backend->lock(fdtv, addr, data);
         if (ret < 0)
                 dev_err(fdtv->device, "CMP: lock I/O error\n");
 
@@ -1288,25 +1288,25 @@ static inline void set_opcr(__be32 *opcr, u32 value, u32 mask, u32 shift)
 
 int cmp_establish_pp_connection(struct firedtv *fdtv, int plug, int channel)
 {
-        __be32 old_opcr, opcr;
+        __be32 old_opcr, opcr[2];
         u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
         int attempts = 0;
         int ret;
 
-        ret = cmp_read(fdtv, &opcr, opcr_address, 4);
+        ret = cmp_read(fdtv, opcr, opcr_address, 4);
         if (ret < 0)
                 return ret;
 
 repeat:
-        if (!get_opcr_online(opcr)) {
+        if (!get_opcr_online(*opcr)) {
                 dev_err(fdtv->device, "CMP: output offline\n");
                 return -EBUSY;
         }
 
-        old_opcr = opcr;
+        old_opcr = *opcr;
 
-        if (get_opcr_p2p_connections(opcr)) {
-                if (get_opcr_channel(opcr) != channel) {
+        if (get_opcr_p2p_connections(*opcr)) {
+                if (get_opcr_channel(*opcr) != channel) {
                         dev_err(fdtv->device, "CMP: cannot change channel\n");
                         return -EBUSY;
                 }
@@ -1314,11 +1314,11 @@ repeat:
 
                 /* We don't allocate isochronous resources. */
         } else {
-                set_opcr_channel(&opcr, channel);
-                set_opcr_data_rate(&opcr, 2); /* S400 */
+                set_opcr_channel(opcr, channel);
+                set_opcr_data_rate(opcr, 2); /* S400 */
 
                 /* FIXME: this is for the worst case - optimize */
-                set_opcr_overhead_id(&opcr, 0);
+                set_opcr_overhead_id(opcr, 0);
 
                 /*
                  * FIXME: allocate isochronous channel and bandwidth at IRM
@@ -1326,13 +1326,16 @@ repeat:
                  */
         }
 
-        set_opcr_p2p_connections(&opcr, get_opcr_p2p_connections(opcr) + 1);
+        set_opcr_p2p_connections(opcr, get_opcr_p2p_connections(*opcr) + 1);
 
-        ret = cmp_lock(fdtv, &opcr, opcr_address, old_opcr);
+        opcr[1] = *opcr;
+        opcr[0] = old_opcr;
+
+        ret = cmp_lock(fdtv, opcr_address, opcr);
         if (ret < 0)
                 return ret;
 
-        if (old_opcr != opcr) {
+        if (old_opcr != *opcr) {
                 /*
                  * FIXME: if old_opcr.P2P_Connections > 0,
                  * deallocate isochronous channel and bandwidth at IRM
@@ -1350,27 +1353,30 @@ repeat:
 
 void cmp_break_pp_connection(struct firedtv *fdtv, int plug, int channel)
 {
-        __be32 old_opcr, opcr;
+        __be32 old_opcr, opcr[2];
         u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
         int attempts = 0;
 
-        if (cmp_read(fdtv, &opcr, opcr_address, 4) < 0)
+        if (cmp_read(fdtv, opcr, opcr_address, 4) < 0)
                 return;
 
 repeat:
-        if (!get_opcr_online(opcr) || !get_opcr_p2p_connections(opcr) ||
-            get_opcr_channel(opcr) != channel) {
+        if (!get_opcr_online(*opcr) || !get_opcr_p2p_connections(*opcr) ||
+            get_opcr_channel(*opcr) != channel) {
                 dev_err(fdtv->device, "CMP: no connection to break\n");
                 return;
         }
 
-        old_opcr = opcr;
-        set_opcr_p2p_connections(&opcr, get_opcr_p2p_connections(opcr) - 1);
+        old_opcr = *opcr;
+        set_opcr_p2p_connections(opcr, get_opcr_p2p_connections(*opcr) - 1);
+
+        opcr[1] = *opcr;
+        opcr[0] = old_opcr;
 
-        if (cmp_lock(fdtv, &opcr, opcr_address, old_opcr) < 0)
+        if (cmp_lock(fdtv, opcr_address, opcr) < 0)
                 return;
 
-        if (old_opcr != opcr) {
+        if (old_opcr != *opcr) {
                 /*
                  * FIXME: if old_opcr.P2P_Connections == 1, i.e. we were last
                  * owner, deallocate isochronous channel and bandwidth at IRM
diff --git a/drivers/media/dvb/firewire/firedtv.h b/drivers/media/dvb/firewire/firedtv.h
index d48530b81e6..1b99660a839 100644
--- a/drivers/media/dvb/firewire/firedtv.h
+++ b/drivers/media/dvb/firewire/firedtv.h
@@ -72,7 +72,7 @@ struct input_dev;
 struct firedtv;
 
 struct firedtv_backend {
-        int (*lock)(struct firedtv *fdtv, u64 addr, void *data, __be32 arg);
+        int (*lock)(struct firedtv *fdtv, u64 addr, __be32 data[]);
         int (*read)(struct firedtv *fdtv, u64 addr, void *data, size_t len);
         int (*write)(struct firedtv *fdtv, u64 addr, void *data, size_t len);
         int (*start_iso)(struct firedtv *fdtv);