dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

ieee1394: sbp2: convert sbp2util_down_timeout to waitqueue 

The waitqueue API is used to replace a custom wait mechanism.  Only one
global waitqueue (instead of per-device waitqueues or completions) is
added because there is usually just one waiter.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2006-07-23 22:19:00 +02:00
parent 6065772d54
commit e8398bb737
2 changed files with 27 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/ieee1394/sbp2.c
View File

@ -55,12 +55,12 @@
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/atomic.h>
#include <asm/system.h>
#include <asm/scatterlist.h>
@ -420,21 +420,23 @@ static void sbp2util_packet_dump(void *buffer, int length, char *dump_name,
#define sbp2util_packet_dump(w,x,y,z)
#endif
/*
* Goofy routine that basically does a down_timeout function.
*/
static int sbp2util_down_timeout(atomic_t *done, int timeout)
{
int i;
static DECLARE_WAIT_QUEUE_HEAD(access_wq);
for (i = timeout; (i > 0 && atomic_read(done) == 0); i-= HZ/10) {
if (msleep_interruptible(100)) /* 100ms */
return 1;
}
return (i > 0) ? 0 : 1;
/*
* Waits for completion of an SBP-2 access request.
* Returns nonzero if timed out or prematurely interrupted.
*/
static int sbp2util_access_timeout(struct scsi_id_instance_data *scsi_id,
int timeout)
{
long leftover = wait_event_interruptible_timeout(
access_wq, scsi_id->access_complete, timeout);
scsi_id->access_complete = 0;
return leftover <= 0;
}
/* Free's an allocated packet */
/* Frees an allocated packet */
static void sbp2_free_packet(struct hpsb_packet *packet)
{
hpsb_free_tlabel(packet);
@ -794,7 +796,6 @@ static struct scsi_id_instance_data *sbp2_alloc_device(struct unit_directory *ud
scsi_id->speed_code = IEEE1394_SPEED_100;
scsi_id->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100];
scsi_id->status_fifo_addr = CSR1212_INVALID_ADDR_SPACE;
atomic_set(&scsi_id->sbp2_login_complete, 0);
INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_inuse);
INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_completed);
INIT_LIST_HEAD(&scsi_id->scsi_list);
@ -1187,11 +1188,9 @@ static int sbp2_query_logins(struct scsi_id_instance_data *scsi_id)
data[1] = scsi_id->query_logins_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
atomic_set(&scsi_id->sbp2_login_complete, 0);
hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);
if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, 2*HZ)) {
if (sbp2util_access_timeout(scsi_id, 2*HZ)) {
SBP2_INFO("Error querying logins to SBP-2 device - timed out");
return -EIO;
}
@ -1279,15 +1278,13 @@ static int sbp2_login_device(struct scsi_id_instance_data *scsi_id)
data[1] = scsi_id->login_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
atomic_set(&scsi_id->sbp2_login_complete, 0);
hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);
/*
* Wait for login status (up to 20 seconds)...
*/
if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, 20*HZ)) {
SBP2_ERR("Error logging into SBP-2 device - login timed-out");
if (sbp2util_access_timeout(scsi_id, 20*HZ)) {
SBP2_ERR("Error logging into SBP-2 device - timed out");
return -EIO;
}
@ -1374,21 +1371,17 @@ static int sbp2_logout_device(struct scsi_id_instance_data *scsi_id)
data[1] = scsi_id->logout_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
atomic_set(&scsi_id->sbp2_login_complete, 0);
error = hpsb_node_write(scsi_id->ne,
scsi_id->sbp2_management_agent_addr, data, 8);
if (error)
return error;
/* Wait for device to logout...1 second. */
if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, HZ))
if (sbp2util_access_timeout(scsi_id, HZ))
return -EIO;
SBP2_INFO("Logged out of SBP-2 device");
return 0;
}
/*
@ -1436,8 +1429,6 @@ static int sbp2_reconnect_device(struct scsi_id_instance_data *scsi_id)
data[1] = scsi_id->reconnect_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
atomic_set(&scsi_id->sbp2_login_complete, 0);
error = hpsb_node_write(scsi_id->ne,
scsi_id->sbp2_management_agent_addr, data, 8);
if (error)
@ -1446,8 +1437,8 @@ static int sbp2_reconnect_device(struct scsi_id_instance_data *scsi_id)
/*
* Wait for reconnect status (up to 1 second)...
*/
if (sbp2util_down_timeout(&scsi_id->sbp2_login_complete, HZ)) {
SBP2_ERR("Error reconnecting to SBP-2 device - reconnect timed-out");
if (sbp2util_access_timeout(scsi_id, HZ)) {
SBP2_ERR("Error reconnecting to SBP-2 device - timed out");
return -EIO;
}
@ -2215,8 +2206,10 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid,
if ((sb->ORB_offset_lo == scsi_id->reconnect_orb_dma) ||
(sb->ORB_offset_lo == scsi_id->login_orb_dma) ||
(sb->ORB_offset_lo == scsi_id->query_logins_orb_dma) ||
(sb->ORB_offset_lo == scsi_id->logout_orb_dma))
atomic_set(&scsi_id->sbp2_login_complete, 1);
(sb->ORB_offset_lo == scsi_id->logout_orb_dma)) {
scsi_id->access_complete = 1;
wake_up_interruptible(&access_wq);
}
}
if (SCpnt) {

4
drivers/ieee1394/sbp2.h
View File

@ -320,9 +320,9 @@ struct scsi_id_instance_data {
u64 status_fifo_addr;
/*
* Variable used for logins, reconnects, logouts, query logins
* Waitqueue flag for logins, reconnects, logouts, query logins
*/
atomic_t sbp2_login_complete;
int access_complete:1;
/*
* Pool of command orbs, so we can have more than overlapped command per id