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authorClemens Ladisch <clemens@ladisch.de>2010-04-12 10:35:18 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-04-19 19:58:32 +0200
commitd6372b6e7c6142e6cc2108b3b850584cd7ade106 (patch)
tree14ae5783465c1f987de1d33e5a2a70db71acbb0a
parent3a1f0a0e3d871e3d3e08a1429009992151becda8 (diff)
firewire: core: fw_iso_resource_manage: return -EBUSY when out of resources
Returning -EIO for all errors would not allow clients to determine if the resource allocation process itself failed, or if the resources are not available. (The latter information is needed by CMP to synchronize restoring of overlayed connections after a bus reset.) Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
-rw-r--r--drivers/firewire/core-iso.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index 34a513725c9e..9198e030e895 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -189,7 +189,7 @@ static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
for (try = 0; try < 5; try++) {
new = allocate ? old - bandwidth : old + bandwidth;
if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL)
- break;
+ return -EBUSY;
data[0] = cpu_to_be32(old);
data[1] = cpu_to_be32(new);
@@ -217,7 +217,7 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
u32 channels_mask, u64 offset, bool allocate, __be32 data[2])
{
__be32 c, all, old;
- int i, retry = 5;
+ int i, ret = -EIO, retry = 5;
old = all = allocate ? cpu_to_be32(~0) : 0;
@@ -225,6 +225,8 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
if (!(channels_mask & 1 << i))
continue;
+ ret = -EBUSY;
+
c = cpu_to_be32(1 << (31 - i));
if ((old & c) != (all & c))
continue;
@@ -253,11 +255,13 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
if (retry) {
retry--;
i--;
+ } else {
+ ret = -EIO;
}
}
}
- return -EIO;
+ return ret;
}
static void deallocate_channel(struct fw_card *card, int irm_id,