[PATCH] yenta: don't mess with bridge control register
In interrupt probing (both ISA and PCI) the bridge control register is used
to change interrupt routing to ISA or PCI by changing bit 7. But this bit
only controls the routing of card functional interrupts, not the CSC
interrupts which are used for interrupt probing.
A bad side effect of messing with this register in yenta_probe_irq() is
that it can lead to irq storms if a card is inserted and already powered by
the BIOS.
Usage in yenta_sock_init() and yenta_config_init() seem to be fishy as well.
Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index fd2a6f8..53a02f0 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -559,12 +559,6 @@
static int yenta_sock_init(struct pcmcia_socket *sock)
{
struct yenta_socket *socket = container_of(sock, struct yenta_socket, socket);
- u16 bridge;
-
- bridge = config_readw(socket, CB_BRIDGE_CONTROL) & ~CB_BRIDGE_INTR;
- if (!socket->cb_irq)
- bridge |= CB_BRIDGE_INTR;
- config_writew(socket, CB_BRIDGE_CONTROL, bridge);
exca_writeb(socket, I365_GBLCTL, 0x00);
exca_writeb(socket, I365_GENCTL, 0x00);
@@ -890,16 +884,8 @@
{
int i;
unsigned long val;
- u16 bridge_ctrl;
u32 mask;
- /* Set up ISA irq routing to probe the ISA irqs.. */
- bridge_ctrl = config_readw(socket, CB_BRIDGE_CONTROL);
- if (!(bridge_ctrl & CB_BRIDGE_INTR)) {
- bridge_ctrl |= CB_BRIDGE_INTR;
- config_writew(socket, CB_BRIDGE_CONTROL, bridge_ctrl);
- }
-
/*
* Probe for usable interrupts using the force
* register to generate bogus card status events.
@@ -921,9 +907,6 @@
mask = probe_irq_mask(val) & 0xffff;
- bridge_ctrl &= ~CB_BRIDGE_INTR;
- config_writew(socket, CB_BRIDGE_CONTROL, bridge_ctrl);
-
return mask;
}
@@ -951,18 +934,11 @@
/* probes the PCI interrupt, use only on override functions */
static int yenta_probe_cb_irq(struct yenta_socket *socket)
{
- u16 bridge_ctrl;
-
if (!socket->cb_irq)
return -1;
socket->probe_status = 0;
- /* disable ISA interrupts */
- bridge_ctrl = config_readw(socket, CB_BRIDGE_CONTROL);
- bridge_ctrl &= ~CB_BRIDGE_INTR;
- config_writew(socket, CB_BRIDGE_CONTROL, bridge_ctrl);
-
if (request_irq(socket->cb_irq, yenta_probe_handler, SA_SHIRQ, "yenta", socket)) {
printk(KERN_WARNING "Yenta: request_irq() in yenta_probe_cb_irq() failed!\n");
return -1;
@@ -973,7 +949,7 @@
cb_writel(socket, CB_SOCKET_EVENT, -1);
cb_writel(socket, CB_SOCKET_MASK, CB_CSTSMASK);
cb_writel(socket, CB_SOCKET_FORCE, CB_FCARDSTS);
-
+
msleep(100);
/* disable interrupts */
@@ -1038,8 +1014,8 @@
* - PCI interrupts enabled if a PCI interrupt exists..
*/
bridge = config_readw(socket, CB_BRIDGE_CONTROL);
- bridge &= ~(CB_BRIDGE_CRST | CB_BRIDGE_PREFETCH1 | CB_BRIDGE_INTR | CB_BRIDGE_ISAEN | CB_BRIDGE_VGAEN);
- bridge |= CB_BRIDGE_PREFETCH0 | CB_BRIDGE_POSTEN | CB_BRIDGE_INTR;
+ bridge &= ~(CB_BRIDGE_CRST | CB_BRIDGE_PREFETCH1 | CB_BRIDGE_ISAEN | CB_BRIDGE_VGAEN);
+ bridge |= CB_BRIDGE_PREFETCH0 | CB_BRIDGE_POSTEN;
config_writew(socket, CB_BRIDGE_CONTROL, bridge);
}