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authorArnd Bergmann <arnd@arndb.de>2014-02-26 12:01:53 +0100
committerDavid S. Miller <davem@davemloft.net>2014-02-26 16:06:13 -0500
commitc728cc88cec52a6bf97679ed4353bc42ff25e6ab (patch)
tree37d77f03a9d6a9046ad8e850d65a26ea8b23a208
parente5b3fa1547283b25d5e68ad2563b7e7dd8cb1209 (diff)
downloadop-kernel-dev-c728cc88cec52a6bf97679ed4353bc42ff25e6ab.zip
op-kernel-dev-c728cc88cec52a6bf97679ed4353bc42ff25e6ab.tar.gz
isdn: hisax/elsa: fix sleep_on race in elsa FSM
The state machine code in the elsa driver uses interruptible_sleep_on to wait for state changes, which is racy. A closer look at the possible states reveals that it is always used to wait for getting back into ARCOFI_NOP, so we can use wait_event_interruptible instead. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/isdn/hisax/elsa.c9
-rw-r--r--drivers/isdn/hisax/elsa_ser.c3
2 files changed, 8 insertions, 4 deletions
diff --git a/drivers/isdn/hisax/elsa.c b/drivers/isdn/hisax/elsa.c
index 2be1c8a..d8ef64d 100644
--- a/drivers/isdn/hisax/elsa.c
+++ b/drivers/isdn/hisax/elsa.c
@@ -509,7 +509,8 @@ static void
set_arcofi(struct IsdnCardState *cs, int bc) {
cs->dc.isac.arcofi_bc = bc;
arcofi_fsm(cs, ARCOFI_START, &ARCOFI_COP_5);
- interruptible_sleep_on(&cs->dc.isac.arcofi_wait);
+ wait_event_interruptible(cs->dc.isac.arcofi_wait,
+ cs->dc.isac.arcofi_state == ARCOFI_NOP);
}
static int
@@ -528,7 +529,8 @@ check_arcofi(struct IsdnCardState *cs)
}
cs->dc.isac.arcofi_bc = 0;
arcofi_fsm(cs, ARCOFI_START, &ARCOFI_VERSION);
- interruptible_sleep_on(&cs->dc.isac.arcofi_wait);
+ wait_event_interruptible(cs->dc.isac.arcofi_wait,
+ cs->dc.isac.arcofi_state == ARCOFI_NOP);
if (!test_and_clear_bit(FLG_ARCOFI_ERROR, &cs->HW_Flags)) {
debugl1(cs, "Arcofi response received %d bytes", cs->dc.isac.mon_rxp);
p = cs->dc.isac.mon_rx;
@@ -595,7 +597,8 @@ check_arcofi(struct IsdnCardState *cs)
Elsa_Types[cs->subtyp],
cs->hw.elsa.base + 8);
arcofi_fsm(cs, ARCOFI_START, &ARCOFI_XOP_0);
- interruptible_sleep_on(&cs->dc.isac.arcofi_wait);
+ wait_event_interruptible(cs->dc.isac.arcofi_wait,
+ cs->dc.isac.arcofi_state == ARCOFI_NOP);
return (1);
}
return (0);
diff --git a/drivers/isdn/hisax/elsa_ser.c b/drivers/isdn/hisax/elsa_ser.c
index 3f84dd8..a2a358c 100644
--- a/drivers/isdn/hisax/elsa_ser.c
+++ b/drivers/isdn/hisax/elsa_ser.c
@@ -573,7 +573,8 @@ modem_l2l1(struct PStack *st, int pr, void *arg)
test_and_clear_bit(BC_FLG_ACTIV, &bcs->Flag);
bcs->cs->dc.isac.arcofi_bc = st->l1.bc;
arcofi_fsm(bcs->cs, ARCOFI_START, &ARCOFI_XOP_0);
- interruptible_sleep_on(&bcs->cs->dc.isac.arcofi_wait);
+ wait_event_interruptible(bcs->cs->dc.isac.arcofi_wait,
+ bcs->cs->dc.isac.arcofi_state == ARCOFI_NOP);
bcs->cs->hw.elsa.MFlag = 1;
} else {
printk(KERN_WARNING "ElsaSer: unknown pr %x\n", pr);
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