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firewire: core: fix unstable I/O with Canon camcorder

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Regression since commit 1038953674, "firewire: core: check for 1394a
compliant IRM, fix inaccessibility of Sony camcorder":

The camcorder Canon MV5i generates lots of bus resets when asynchronous
requests are sent to it (e.g. Config ROM read requests or FCP Command
write requests) if the camcorder is not root node.  This causes drop-
outs in videos or makes the camcorder entirely inaccessible.
https://bugzilla.redhat.com/show_bug.cgi?id=633260

Fix this by allowing any Canon device, even if it is a pre-1394a IRM
like MV5i are, to remain root node (if it is at least Cycle Master
capable).  With the FireWire controller cards that I tested, MV5i always
becomes root node when plugged in and left to its own devices.

Reported-by: Ralf Lange
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: <stable@kernel.org> # 2.6.32.y and newer
This commit is contained in:
Stefan Richter 2011-01-15 18:19:48 +01:00
parent 1427130425
commit 6044565af4
1 changed files with 9 additions and 2 deletions
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11
drivers/firewire/core-card.c
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@ -75,6 +75,8 @@ static size_t config_rom_length = 1 + 4 + 1 + 1;
#define BIB_IRMC ((1) << 31)
#define NODE_CAPABILITIES 0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */
#define CANON_OUI 0x000085
static void generate_config_rom(struct fw_card *card, __be32 *config_rom)
{
struct fw_descriptor *desc;
@ -284,6 +286,7 @@ static void bm_work(struct work_struct *work)
bool root_device_is_running;
bool root_device_is_cmc;
bool irm_is_1394_1995_only;
bool keep_this_irm;
spin_lock_irq(&card->lock);
@ -305,6 +308,10 @@ static void bm_work(struct work_struct *work)
irm_is_1394_1995_only = irm_device && irm_device->config_rom &&
(irm_device->config_rom[2] & 0x000000f0) == 0;
/* Canon MV5i works unreliably if it is not root node. */
keep_this_irm = irm_device && irm_device->config_rom &&
irm_device->config_rom[3] >> 8 == CANON_OUI;
root_id = root_node->node_id;
irm_id = card->irm_node->node_id;
local_id = card->local_node->node_id;
@ -333,7 +340,7 @@ static void bm_work(struct work_struct *work)
goto pick_me;
}
if (irm_is_1394_1995_only) {
if (irm_is_1394_1995_only && !keep_this_irm) {
new_root_id = local_id;
fw_notify("%s, making local node (%02x) root.\n",
"IRM is not 1394a compliant", new_root_id);
@ -382,7 +389,7 @@ static void bm_work(struct work_struct *work)
spin_lock_irq(&card->lock);
if (rcode != RCODE_COMPLETE) {
if (rcode != RCODE_COMPLETE && !keep_this_irm) {
/*
* The lock request failed, maybe the IRM
* isn't really IRM capable after all. Let's