Re: [PATCH] dss1_divert ISDN module compile fix for kernel 2.6.8.1

From: Steffen A. Mork
Date: Wed Nov 17 2004 - 14:00:38 EST

Dear Linus and Bartlomiej,

when I switched my installation from kernel 2.4 to 2.6 I
recognized that the ISDN module dss1_divert was marked
incompilable (config option CONFIG_CLEAN_COMPILE must
be turned off). The compile problem was the obsolete using
of kernel 2.4 critical sections. I replaced the cli() stuff
with spinlocks as explained in the Documentation/spinlocks.txt
file. After that the module compiles and runs as expected.


This looks wrong, you are using many private spinlocks instead
of one global spinlock.
OK, thank you. I went into the copy/paste trap. I corrected the patch to
a global spinlock and tested it successfully.

The corrected patch is applied to kernel 2.6.8.1 and should work for
all 2.6 versions. You may also download the patch via http, too:

http://ls7-www.cs.uni-dortmund.de/~mork/dss1_divert.diff

Signed-off-by: Steffen A. Mork <linux-dev@xxxxxxxxxx>

diff -uprN -X dontdiff linux-vanilla/drivers/isdn/divert/divert_init.c linux-2.6.8.1/drivers/isdn/divert/divert_init.c
--- linux-vanilla/drivers/isdn/divert/divert_init.c 2004-08-14 12:55:47.000000000 +0200
+++ linux-2.6.8.1/drivers/isdn/divert/divert_init.c 2004-11-17 17:50:38.000000000 +0100
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
+
#include "isdn_divert.h"

MODULE_DESCRIPTION("ISDN4Linux: Call diversion support");
@@ -59,23 +60,23 @@ static int __init divert_init(void)
/* Module deinit code */
/**********************/
static void __exit divert_exit(void)
-{ unsigned long flags;
+{
+ unsigned long flags;
int i;

- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
divert_if.cmd = DIVERT_CMD_REL; /* release */
if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR)
{ printk(KERN_WARNING "dss1_divert: error %d releasing module\n",i);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
return;
}
if (divert_dev_deinit())
{ printk(KERN_WARNING "dss1_divert: device busy, remove cancelled\n");
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
return;
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
deleterule(-1); /* delete all rules and free mem */
deleteprocs();
printk(KERN_INFO "dss1_divert module successfully removed \n");
diff -uprN -X dontdiff linux-vanilla/drivers/isdn/divert/divert_procfs.c linux-2.6.8.1/drivers/isdn/divert/divert_procfs.c
--- linux-vanilla/drivers/isdn/divert/divert_procfs.c 2004-08-14 12:56:22.000000000 +0200
+++ linux-2.6.8.1/drivers/isdn/divert/divert_procfs.c 2004-11-17 17:42:00.000000000 +0100
@@ -22,6 +22,7 @@
#include <linux/isdnif.h>
#include "isdn_divert.h"

+
/*********************************/
/* Variables for interface queue */
/*********************************/
@@ -215,10 +216,9 @@ isdn_divert_ioctl(struct inode *inode, s
case IIOCMODRULE:
if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
return (-EINVAL);
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
*rulep = dioctl.getsetrule.rule; /* copy data */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
return (0); /* no copy required */
break;

diff -uprN -X dontdiff linux-vanilla/drivers/isdn/divert/isdn_divert.c linux-2.6.8.1/drivers/isdn/divert/isdn_divert.c
--- linux-vanilla/drivers/isdn/divert/isdn_divert.c 2004-08-14 12:55:34.000000000 +0200
+++ linux-2.6.8.1/drivers/isdn/divert/isdn_divert.c 2004-11-17 19:39:32.000000000 +0100
@@ -11,6 +11,7 @@

#include <linux/version.h>
#include <linux/proc_fs.h>
+
#include "isdn_divert.h"

/**********************************/
@@ -47,54 +48,53 @@ static struct deflect_struc *table_head
static struct deflect_struc *table_tail = NULL;
static unsigned char extern_wait_max = 4; /* maximum wait in s for external process */

+spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
+
/***************************/
/* timer callback function */
/***************************/
static void deflect_timer_expire(ulong arg)
-{ unsigned long flags;
+{
+ unsigned long flags;
struct call_struc *cs = (struct call_struc *) arg;

- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
del_timer(&cs->timer); /* delete active timer */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);

switch(cs->akt_state)
{ case DEFLECT_PROCEED:
cs->ics.command = ISDN_CMD_HANGUP; /* cancel action */
divert_if.ll_cmd(&cs->ics);
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
add_timer(&cs->timer);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
break;

case DEFLECT_ALERT:
cs->ics.command = ISDN_CMD_REDIR; /* protocol */
strcpy(cs->ics.parm.setup.phone,cs->deflect_dest);
strcpy(cs->ics.parm.setup.eazmsn,"Testtext delayed");
- divert_if.ll_cmd(&cs->ics);
- save_flags(flags);
- cli();
+ divert_if.ll_cmd(&cs->ics);
+ spin_lock_irqsave(&divert_lock, flags);
cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
add_timer(&cs->timer);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
break;

case DEFLECT_AUTODEL:
default:
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
if (cs->prev)
cs->prev->next = cs->next; /* forward link */
else
divert_head = cs->next;
if (cs->next)
cs->next->prev = cs->prev; /* back link */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
kfree(cs);
return;

@@ -166,10 +166,9 @@ int cf_command(int drvid, int mode,
cs->ics.parm.dss1_io.datalen = p - tmp; /* total len */
cs->ics.parm.dss1_io.data = tmp; /* start of buffer */

- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
cs->ics.parm.dss1_io.ll_id = next_id++; /* id for callback */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
*procid = cs->ics.parm.dss1_io.ll_id;

sprintf(cs->info,"%d 0x%lx %s%s 0 %s %02x %d%s%s\n",
@@ -187,11 +186,10 @@ int cf_command(int drvid, int mode,

if (!retval)
{ cs->prev = NULL;
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
cs->next = divert_head;
divert_head = cs;
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
}
else
kfree(cs);
@@ -224,13 +222,12 @@ int deflect_extern_action(u_char cmd, ul
{ case 0: /* hangup */
del_timer(&cs->timer);
ic.command = ISDN_CMD_HANGUP;
- i = divert_if.ll_cmd(&ic);
- save_flags(flags);
- cli();
+ i = divert_if.ll_cmd(&ic);
+ spin_lock_irqsave(&divert_lock, flags);
cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
add_timer(&cs->timer);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
break;

case 1: /* alert */
@@ -239,12 +236,12 @@ int deflect_extern_action(u_char cmd, ul
del_timer(&cs->timer);
ic.command = ISDN_CMD_ALERT;
if ((i = divert_if.ll_cmd(&ic)))
- { save_flags(flags);
- cli();
+ {
+ spin_lock_irqsave(&divert_lock, flags);
cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
add_timer(&cs->timer);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
}
else
cs->akt_state = DEFLECT_ALERT;
@@ -256,12 +253,12 @@ int deflect_extern_action(u_char cmd, ul
strcpy(cs->ics.parm.setup.eazmsn, "Testtext manual");
ic.command = ISDN_CMD_REDIR;
if ((i = divert_if.ll_cmd(&ic)))
- { save_flags(flags);
- cli();
+ {
+ spin_lock_irqsave(&divert_lock, flags);
cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
add_timer(&cs->timer);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
}
else
cs->akt_state = DEFLECT_ALERT;
@@ -284,8 +281,7 @@ int insertrule(int idx, divert_rule *new

ds->rule = *newrule; /* set rule */

- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);

if (idx >= 0)
{ ds1 = table_head;
@@ -313,7 +309,7 @@ int insertrule(int idx, divert_rule *new
table_head = ds; /* first element */
}

- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
return(0);
} /* insertrule */

@@ -325,12 +321,11 @@ int deleterule(int idx)
unsigned long flags;

if (idx < 0)
- { save_flags(flags);
- cli();
+ { spin_lock_irqsave(&divert_lock, flags);
ds = table_head;
table_head = NULL;
table_tail = NULL;
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
while (ds)
{ ds1 = ds;
ds = ds->next;
@@ -339,8 +334,7 @@ int deleterule(int idx)
return(0);
}

- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
ds = table_head;

while ((ds) && (idx > 0))
@@ -349,7 +343,8 @@ int deleterule(int idx)
}

if (!ds)
- { restore_flags(flags);
+ {
+ spin_unlock_irqrestore(&divert_lock, flags);
return(-EINVAL);
}

@@ -363,7 +358,7 @@ int deleterule(int idx)
else
table_head = ds->next; /* start of chain */

- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
kfree(ds);
return(0);
} /* deleterule */
@@ -474,10 +469,9 @@ int isdn_divert_icall(isdn_ctrl *ic)
else
cs->timer.expires = 0;
cs->akt_state = dv->rule.action;
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
cs->divert_id = next_id++; /* new sequence number */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
cs->prev = NULL;
if (cs->akt_state == DEFLECT_ALERT)
{ strcpy(cs->deflect_dest,dv->rule.to_nr);
@@ -525,12 +519,11 @@ int isdn_divert_icall(isdn_ctrl *ic)

if (cs)
{ cs->prev = NULL;
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
cs->next = divert_head;
divert_head = cs;
if (cs->timer.expires) add_timer(&cs->timer);
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);

put_info_buffer(cs->info);
return(retval);
@@ -544,8 +537,7 @@ void deleteprocs(void)
{ struct call_struc *cs, *cs1;
unsigned long flags;

- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
cs = divert_head;
divert_head = NULL;
while (cs)
@@ -554,7 +546,7 @@ void deleteprocs(void)
cs = cs->next;
kfree(cs1);
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
} /* deleteprocs */

/****************************************************/
@@ -769,8 +761,8 @@ int prot_stat_callback(isdn_ctrl *ic)
}

if (cs1->ics.driver == -1)
- { save_flags(flags);
- cli();
+ {
+ spin_lock_irqsave(&divert_lock, flags);
del_timer(&cs1->timer);
if (cs1->prev)
cs1->prev->next = cs1->next; /* forward link */
@@ -778,7 +770,7 @@ int prot_stat_callback(isdn_ctrl *ic)
divert_head = cs1->next;
if (cs1->next)
cs1->next->prev = cs1->prev; /* back link */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
kfree(cs1);
}

@@ -826,15 +818,14 @@ int isdn_divert_stat_callback(isdn_ctrl
cs = cs->next;
if (cs1->ics.driver == -1)
{
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&divert_lock, flags);
if (cs1->prev)
cs1->prev->next = cs1->next; /* forward link */
else
divert_head = cs1->next;
if (cs1->next)
cs1->next->prev = cs1->prev; /* back link */
- restore_flags(flags);
+ spin_unlock_irqrestore(&divert_lock, flags);
kfree(cs1);
}
}
diff -uprN -X dontdiff linux-vanilla/drivers/isdn/divert/isdn_divert.h linux-2.6.8.1/drivers/isdn/divert/isdn_divert.h
--- linux-vanilla/drivers/isdn/divert/isdn_divert.h 2004-08-14 12:54:51.000000000 +0200
+++ linux-2.6.8.1/drivers/isdn/divert/isdn_divert.h 2004-11-17 18:59:16.000000000 +0100
@@ -114,6 +114,8 @@ struct divert_info
/**************/
/* Prototypes */
/**************/
+extern spinlock_t divert_lock;
+
extern ulong if_used; /* number of interface users */
extern int divert_dev_deinit(void);
extern int divert_dev_init(void);
diff -uprN -X dontdiff linux-vanilla/drivers/isdn/i4l/Kconfig linux-2.6.8.1/drivers/isdn/i4l/Kconfig
--- linux-vanilla/drivers/isdn/i4l/Kconfig 2004-08-14 12:55:10.000000000 +0200
+++ linux-2.6.8.1/drivers/isdn/i4l/Kconfig 2004-11-17 13:34:09.983567648 +0100
@@ -99,7 +99,7 @@ config ISDN_DRV_LOOP

config ISDN_DIVERSION
tristate "Support isdn diversion services"
- depends on BROKEN && BROKEN_ON_SMP
+ depends on ISDN && ISDN_I4L
help
This option allows you to use some supplementary diversion
services in conjunction with the HiSax driver on an EURO/DSS1



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