Commit 1b70485f authored by Clemens Ladisch's avatar Clemens Ladisch
Browse files

ALSA: firewire: extend snd_fw_transaction() 



Add a flag to snd_fw_transaction() to allow it to abort when a bus reset
happens.  This removes most of the duplicated error handling loops that
were required around calls to the low-level fw_run_transaction().

Also add a flag to suppress error messages; errors are expected when we
attempt to clean up after the device was unplugged.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
parent a644a947

sound/firewire/cmp.c

+21 −29
Original line number Diff line number Diff line
@@ -48,9 +48,6 @@ static int pcr_modify(struct cmp_connection *c, 
		      int (*check)(struct cmp_connection *c, __be32 pcr),

		      enum bus_reset_handling bus_reset_handling)

{

	struct fw_device *device = fw_parent_device(c->resources.unit);

	int generation = c->resources.generation;

	int rcode, errors = 0;

	__be32 old_arg, buffer[2];

	int err;
@@ -59,13 +56,19 @@ static int pcr_modify(struct cmp_connection *c, 
		old_arg = buffer[0];

		buffer[1] = modify(c, buffer[0]);



		rcode = fw_run_transaction(

				device->card, TCODE_LOCK_COMPARE_SWAP,

				device->node_id, generation, device->max_speed,

		err = snd_fw_transaction(

				c->resources.unit, TCODE_LOCK_COMPARE_SWAP,

				CSR_REGISTER_BASE + CSR_IPCR(c->pcr_index),

				buffer, 8);

				buffer, 8,

				FW_FIXED_GENERATION | c->resources.generation);



		if (err < 0) {

			if (err == -EAGAIN &&

			    bus_reset_handling == SUCCEED_ON_BUS_RESET)

				err = 0;

			return err;

		}



		if (rcode == RCODE_COMPLETE) {

		if (buffer[0] == old_arg) /* success? */

			break;
@@ -74,21 +77,10 @@ static int pcr_modify(struct cmp_connection *c, 
			if (err < 0)

				return err;

		}

		} else if (rcode == RCODE_GENERATION)

			goto bus_reset;

		else if (rcode_is_permanent_error(rcode) || ++errors >= 3)

			goto io_error;

	}

	c->last_pcr_value = buffer[1];



	return 0;



io_error:

	cmp_error(c, "transaction failed: %s\n", fw_rcode_string(rcode));

	return -EIO;



bus_reset:

	return bus_reset_handling == ABORT_ON_BUS_RESET ? -EAGAIN : 0;

}
@@ -108,7 +100,7 @@ int cmp_connection_init(struct cmp_connection *c, 


	err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,

				 CSR_REGISTER_BASE + CSR_IMPR,

				 &impr_be, 4);

				 &impr_be, 4, 0);

	if (err < 0)

		return err;

	impr = be32_to_cpu(impr_be);

sound/firewire/dice.c

+64 −143
Original line number Diff line number Diff line
@@ -118,7 +118,7 @@ static int dice_owner_set(struct dice *dice) 
{

	struct fw_device *device = fw_parent_device(dice->unit);

	__be64 *buffer;

	int rcode, err, errors = 0;

	int err, errors = 0;



	buffer = kmalloc(2 * 8, GFP_KERNEL);

	if (!buffer)
@@ -132,31 +132,24 @@ static int dice_owner_set(struct dice *dice) 


		dice->owner_generation = device->generation;

		smp_rmb(); /* node_id vs. generation */

		rcode = fw_run_transaction(device->card,

		err = snd_fw_transaction(dice->unit,

					 TCODE_LOCK_COMPARE_SWAP,

					   device->node_id,

					   dice->owner_generation,

					   device->max_speed,

					 global_address(dice, GLOBAL_OWNER),

					   buffer, 2 * 8);

					 buffer, 2 * 8,

					 FW_FIXED_GENERATION |

							dice->owner_generation);



		if (rcode == RCODE_COMPLETE) {

			if (buffer[0] == cpu_to_be64(OWNER_NO_OWNER)) {

				err = 0;

			} else {

		if (err == 0) {

			if (buffer[0] != cpu_to_be64(OWNER_NO_OWNER)) {

				dev_err(&dice->unit->device,

					"device is already in use\n");

				err = -EBUSY;

			}

			break;

		}

		if (rcode_is_permanent_error(rcode) || ++errors >= 3) {

			dev_err(&dice->unit->device,

				"setting device owner failed: %s\n",

				fw_rcode_string(rcode));

			err = -EIO;

		if (err != -EAGAIN || ++errors >= 3)

			break;

		}



		msleep(20);

	}
@@ -169,7 +162,7 @@ static int dice_owner_update(struct dice *dice) 
{

	struct fw_device *device = fw_parent_device(dice->unit);

	__be64 *buffer;

	int rcode, err, errors = 0;

	int err;



	if (dice->owner_generation == -1)

		return 0;
@@ -178,7 +171,6 @@ static int dice_owner_update(struct dice *dice) 
	if (!buffer)

		return -ENOMEM;



	for (;;) {

	buffer[0] = cpu_to_be64(OWNER_NO_OWNER);

	buffer[1] = cpu_to_be64(

		((u64)device->card->node_id << OWNER_NODE_SHIFT) |
@@ -186,36 +178,19 @@ static int dice_owner_update(struct dice *dice) 


	dice->owner_generation = device->generation;

	smp_rmb(); /* node_id vs. generation */

		rcode = fw_run_transaction(device->card,

					   TCODE_LOCK_COMPARE_SWAP,

					   device->node_id,

					   dice->owner_generation,

					   device->max_speed,

	err = snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,

				 global_address(dice, GLOBAL_OWNER),

					   buffer, 2 * 8);

				 buffer, 2 * 8,

				 FW_FIXED_GENERATION | dice->owner_generation);



		if (rcode == RCODE_COMPLETE) {

			if (buffer[0] == cpu_to_be64(OWNER_NO_OWNER)) {

				err = 0;

			} else {

	if (err == 0) {

		if (buffer[0] != cpu_to_be64(OWNER_NO_OWNER)) {

			dev_err(&dice->unit->device,

				"device is already in use\n");

			err = -EBUSY;

		}

			break;

		}

		if (rcode == RCODE_GENERATION) {

	} else if (err == -EAGAIN) {

		err = 0; /* try again later */

			break;

		}

		if (rcode_is_permanent_error(rcode) || ++errors >= 3) {

			dev_err(&dice->unit->device,

				"setting device owner failed: %s\n",

				fw_rcode_string(rcode));

			err = -EIO;

			break;

		}

		msleep(20);

	}



	kfree(buffer);
@@ -230,38 +205,19 @@ static void dice_owner_clear(struct dice *dice) 
{

	struct fw_device *device = fw_parent_device(dice->unit);

	__be64 *buffer;

	int rcode, errors = 0;



	buffer = kmalloc(2 * 8, GFP_KERNEL);

	if (!buffer)

		return;



	for (;;) {

	buffer[0] = cpu_to_be64(

		((u64)device->card->node_id << OWNER_NODE_SHIFT) |

		dice->notification_handler.offset);

	buffer[1] = cpu_to_be64(OWNER_NO_OWNER);



		rcode = fw_run_transaction(device->card,

					   TCODE_LOCK_COMPARE_SWAP,

					   device->node_id,

					   dice->owner_generation,

					   device->max_speed,

	snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,

			   global_address(dice, GLOBAL_OWNER),

					   buffer, 2 * 8);



		if (rcode == RCODE_COMPLETE)

			break;

		if (rcode == RCODE_GENERATION)

			break;

		if (rcode_is_permanent_error(rcode) || ++errors >= 3) {

			dev_err(&dice->unit->device,

				"clearing device owner failed: %s\n",

				fw_rcode_string(rcode));

			break;

		}

		msleep(20);

	}

			   buffer, 2 * 8, FW_QUIET |

			   FW_FIXED_GENERATION | dice->owner_generation);



	kfree(buffer);
@@ -270,67 +226,32 @@ static void dice_owner_clear(struct dice *dice) 


static int dice_enable_set(struct dice *dice)

{

	struct fw_device *device = fw_parent_device(dice->unit);

	__be32 value;

	int rcode, err, errors = 0;

	int err;



	value = cpu_to_be32(1);

	for (;;) {

		rcode = fw_run_transaction(device->card,

					   TCODE_WRITE_QUADLET_REQUEST,

					   device->node_id,

					   dice->owner_generation,

					   device->max_speed,

	err = snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,

				 global_address(dice, GLOBAL_ENABLE),

					   &value, 4);

		if (rcode == RCODE_COMPLETE) {

				 &value, 4,

				 FW_FIXED_GENERATION | dice->owner_generation);

	if (err < 0)

		return err;



	dice->global_enabled = true;

			err = 0;

			break;

		}

		if (rcode == RCODE_GENERATION) {

			err = -EAGAIN;

			break;

		}

		if (rcode_is_permanent_error(rcode) || ++errors >= 3) {

			dev_err(&dice->unit->device,

				"device enabling failed: %s\n",

				fw_rcode_string(rcode));

			err = -EIO;

			break;

		}

		msleep(20);

	}



	return err;

	return 0;

}



static void dice_enable_clear(struct dice *dice)

{

	struct fw_device *device = fw_parent_device(dice->unit);

	__be32 value;

	int rcode, errors = 0;



	value = 0;

	for (;;) {

		rcode = fw_run_transaction(device->card,

					   TCODE_WRITE_QUADLET_REQUEST,

					   device->node_id,

					   dice->owner_generation,

					   device->max_speed,

	snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,

			   global_address(dice, GLOBAL_ENABLE),

					   &value, 4);

		if (rcode == RCODE_COMPLETE ||

		    rcode == RCODE_GENERATION)

			break;

		if (rcode_is_permanent_error(rcode) || ++errors >= 3) {

			dev_err(&dice->unit->device,

				"device disabling failed: %s\n",

				fw_rcode_string(rcode));

			break;

		}

		msleep(20);

	}

			   &value, 4, FW_QUIET |

			   FW_FIXED_GENERATION | dice->owner_generation);



	dice->global_enabled = false;

}
@@ -384,7 +305,7 @@ static int dice_open(struct snd_pcm_substream *substream) 


	err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,

				 global_address(dice, GLOBAL_CLOCK_SELECT),

				 &clock_sel, 4);

				 &clock_sel, 4, 0);

	if (err < 0)

		goto err_lock;

	rate_index = (be32_to_cpu(clock_sel) & CLOCK_RATE_MASK)
@@ -396,7 +317,7 @@ static int dice_open(struct snd_pcm_substream *substream) 


	err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,

				 rx_address(dice, RX_NUMBER_AUDIO),

				 data, 2 * 4);

				 data, 2 * 4, 0);

	if (err < 0)

		goto err_lock;

	number_audio = be32_to_cpu(data[0]);
@@ -488,7 +409,7 @@ static int dice_stream_start(struct dice *dice) 
		err = snd_fw_transaction(dice->unit,

					 TCODE_WRITE_QUADLET_REQUEST,

					 rx_address(dice, RX_ISOCHRONOUS),

					 &channel, 4);

					 &channel, 4, 0);

		if (err < 0)

			goto err_resources;

	}
@@ -502,7 +423,7 @@ static int dice_stream_start(struct dice *dice) 
err_rx_channel:

	channel = cpu_to_be32((u32)-1);

	snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,

			   rx_address(dice, RX_ISOCHRONOUS), &channel, 4);

			   rx_address(dice, RX_ISOCHRONOUS), &channel, 4, 0);

err_resources:

	fw_iso_resources_free(&dice->resources);

error:
@@ -528,7 +449,7 @@ static void dice_stream_stop(struct dice *dice) 


	channel = cpu_to_be32((u32)-1);

	snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,

			   rx_address(dice, RX_ISOCHRONOUS), &channel, 4);

			   rx_address(dice, RX_ISOCHRONOUS), &channel, 4, 0);



	fw_iso_resources_free(&dice->resources);

}
@@ -880,7 +801,7 @@ static int dice_interface_check(struct fw_unit *unit) 
	 */

	err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,

				 DICE_PRIVATE_SPACE,

				 pointers, sizeof(pointers));

				 pointers, sizeof(pointers), 0);

	if (err < 0)

		return -ENODEV;

	for (i = 0; i < ARRAY_SIZE(pointers); ++i) {
@@ -896,7 +817,7 @@ static int dice_interface_check(struct fw_unit *unit) 
	err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,

				 DICE_PRIVATE_SPACE +

				 be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,

				 &version, 4);

				 &version, 4, 0);

	if (err < 0)

		return -ENODEV;

	if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
@@ -915,7 +836,7 @@ static int dice_init_offsets(struct dice *dice) 


	err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,

				 DICE_PRIVATE_SPACE,

				 pointers, sizeof(pointers));

				 pointers, sizeof(pointers), 0);

	if (err < 0)

		return err;
@@ -939,7 +860,7 @@ static void dice_card_strings(struct dice *dice) 
	BUILD_BUG_ON(NICK_NAME_SIZE < sizeof(card->shortname));

	err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,

				 global_address(dice, GLOBAL_NICK_NAME),

				 card->shortname, sizeof(card->shortname));

				 card->shortname, sizeof(card->shortname), 0);

	if (err >= 0) {

		/* DICE strings are returned in "always-wrong" endianness */

		BUILD_BUG_ON(sizeof(card->shortname) % 4 != 0);
@@ -1015,14 +936,14 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id) 


	err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,

				 global_address(dice, GLOBAL_CLOCK_SELECT),

				 &clock_sel, 4);

				 &clock_sel, 4, 0);

	if (err < 0)

		goto error;

	clock_sel &= cpu_to_be32(~CLOCK_SOURCE_MASK);

	clock_sel |= cpu_to_be32(CLOCK_SOURCE_ARX1);

	err = snd_fw_transaction(unit, TCODE_WRITE_QUADLET_REQUEST,

				 global_address(dice, GLOBAL_CLOCK_SELECT),

				 &clock_sel, 4);

				 &clock_sel, 4, 0);

	if (err < 0)

		goto error;

sound/firewire/fcp.c

+1 −1
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ int fcp_avc_transaction(struct fw_unit *unit, 
					  : TCODE_WRITE_BLOCK_REQUEST;

		ret = snd_fw_transaction(t.unit, tcode,

					 CSR_REGISTER_BASE + CSR_FCP_COMMAND,

					 (void *)command, command_size);

					 (void *)command, command_size, 0);

		if (ret < 0)

			break;

sound/firewire/isight.c

+20 −23
Original line number Diff line number Diff line
@@ -217,7 +217,7 @@ static void isight_packet(struct fw_iso_context *context, u32 cycle, 


static int isight_connect(struct isight *isight)

{

	int ch, err, rcode, errors = 0;

	int ch, err;

	__be32 value;



retry_after_bus_reset:
@@ -230,26 +230,18 @@ retry_after_bus_reset: 
	}



	value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));

	for (;;) {

		rcode = fw_run_transaction(

				isight->device->card,

				TCODE_WRITE_QUADLET_REQUEST,

				isight->device->node_id,

				isight->resources.generation,

				isight->device->max_speed,

	err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,

				 isight->audio_base + REG_ISO_TX_CONFIG,

				&value, 4);

		if (rcode == RCODE_COMPLETE) {

			return 0;

		} else if (rcode == RCODE_GENERATION) {

				 &value, 4, FW_FIXED_GENERATION |

				 isight->resources.generation);

	if (err == -EAGAIN) {

		fw_iso_resources_free(&isight->resources);

		goto retry_after_bus_reset;

		} else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {

			err = -EIO;

	} else if (err < 0) {

		goto err_resources;

	}

		msleep(5);

	}



	return 0;



err_resources:

	fw_iso_resources_free(&isight->resources);
@@ -315,17 +307,19 @@ static int isight_hw_params(struct snd_pcm_substream *substream, 
static int reg_read(struct isight *isight, int offset, __be32 *value)

{

	return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,

				  isight->audio_base + offset, value, 4);

				  isight->audio_base + offset, value, 4, 0);

}



static int reg_write(struct isight *isight, int offset, __be32 value)

{

	return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,

				  isight->audio_base + offset, &value, 4);

				  isight->audio_base + offset, &value, 4, 0);

}



static void isight_stop_streaming(struct isight *isight)

{

	__be32 value;



	if (!isight->context)

		return;
@@ -333,7 +327,10 @@ static void isight_stop_streaming(struct isight *isight) 
	fw_iso_context_destroy(isight->context);

	isight->context = NULL;

	fw_iso_resources_free(&isight->resources);

	reg_write(isight, REG_AUDIO_ENABLE, 0);

	value = 0;

	snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,

			   isight->audio_base + REG_AUDIO_ENABLE,

			   &value, 4, FW_QUIET);

}



static int isight_hw_free(struct snd_pcm_substream *substream)

sound/firewire/lib.c

+18 −6
Original line number Diff line number Diff line
@@ -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 (;;) {

		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,
@@ -43,8 +50,13 @@ 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",

			if (!(flags & FW_QUIET))

				dev_err(&unit->device,

					"transaction failed: %s\n",

					fw_rcode_string(rcode));

			return -EIO;

		}

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