diff options
Diffstat (limited to 'sound/firewire/lib.c')
| -rw-r--r-- | sound/firewire/lib.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/sound/firewire/lib.c b/sound/firewire/lib.c index 14eb41498372..7409edba9f06 100644 --- a/sound/firewire/lib.c +++ b/sound/firewire/lib.c @@ -11,7 +11,7 @@ #include <linux/module.h> #include "lib.h" -#define ERROR_RETRY_DELAY_MS 5 +#define ERROR_RETRY_DELAY_MS 20 /** * snd_fw_transaction - send a request and wait for its completion @@ -20,6 +20,9 @@ * @offset: the address in the target's address space * @buffer: input/output data * @length: length of @buffer + * @flags: use %FW_FIXED_GENERATION and add the generation value to attempt the + * request only in that generation; use %FW_QUIET to suppress error + * messages * * Submits an asynchronous request to the target device, and waits for the * response. The node ID and the current generation are derived from @unit. @@ -27,14 +30,18 @@ * Returns zero on success, or a negative error code. */ int snd_fw_transaction(struct fw_unit *unit, int tcode, - u64 offset, void *buffer, size_t length) + u64 offset, void *buffer, size_t length, + unsigned int flags) { struct fw_device *device = fw_parent_device(unit); int generation, rcode, tries = 0; + generation = flags & FW_GENERATION_MASK; for (;;) { - generation = device->generation; - smp_rmb(); /* node_id vs. generation */ + if (!(flags & FW_FIXED_GENERATION)) { + generation = device->generation; + smp_rmb(); /* node_id vs. generation */ + } rcode = fw_run_transaction(device->card, tcode, device->node_id, generation, device->max_speed, offset, @@ -43,9 +50,14 @@ int snd_fw_transaction(struct fw_unit *unit, int tcode, if (rcode == RCODE_COMPLETE) return 0; + if (rcode == RCODE_GENERATION && (flags & FW_FIXED_GENERATION)) + return -EAGAIN; + if (rcode_is_permanent_error(rcode) || ++tries >= 3) { - dev_err(&unit->device, "transaction failed: %s\n", - fw_rcode_string(rcode)); + if (!(flags & FW_QUIET)) + dev_err(&unit->device, + "transaction failed: %s\n", + fw_rcode_string(rcode)); return -EIO; } |