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Message-ID: <tkrat.8af4b4844f2dd615@s5r6.in-berlin.de>
Date: Sun, 23 Jul 2006 23:00:16 +0200 (CEST)
From: Stefan Richter <stefanr@...6.in-berlin.de>
To: linux1394-devel@...ts.sourceforge.net
cc: Ben Collins <bcollins@...ntu.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.18-rc1-mm2 6/6] 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@...6.in-berlin.de>
---
drivers/ieee1394/sbp2.c | 51 +++++++++++++++++-----------------------
drivers/ieee1394/sbp2.h | 4 +--
2 files changed, 24 insertions(+), 31 deletions(-)
Index: linux/drivers/ieee1394/sbp2.h
===================================================================
--- linux.orig/drivers/ieee1394/sbp2.h 2006-07-23 10:26:48.000000000 +0200
+++ linux/drivers/ieee1394/sbp2.h 2006-07-23 13:19:35.000000000 +0200
@@ -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
Index: linux/drivers/ieee1394/sbp2.c
===================================================================
--- linux.orig/drivers/ieee1394/sbp2.c 2006-07-23 12:49:15.000000000 +0200
+++ linux/drivers/ieee1394/sbp2.c 2006-07-23 18:57:47.000000000 +0200
@@ -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 *b
#define sbp2util_packet_dump(w,x,y,z)
#endif
+static DECLARE_WAIT_QUEUE_HEAD(access_wq);
+
/*
- * Goofy routine that basically does a down_timeout function.
+ * Waits for completion of an SBP-2 access request.
+ * Returns nonzero if timed out or prematurely interrupted.
*/
-static int sbp2util_down_timeout(atomic_t *done, int timeout)
+static int sbp2util_access_timeout(struct scsi_id_instance_data *scsi_id,
+ int timeout)
{
- int i;
+ long leftover = wait_event_interruptible_timeout(
+ access_wq, scsi_id->access_complete, timeout);
- for (i = timeout; (i > 0 && atomic_read(done) == 0); i-= HZ/10) {
- if (msleep_interruptible(100)) /* 100ms */
- return 1;
- }
- return (i > 0) ? 0 : 1;
+ 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 *sbp
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
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
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 scs
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
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
/*
* 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(stru
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) {
-
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