pcmcia: only keep saved I365_CSCINT flag if there is no PCI irq

Keeping the saved I365_CSCINT flag around breaks PCMCIA on some system,
and is only needed on a few systems to get PCMCIA to work. This patch
allows PCMCIA to work on both types, and it fixes
https://bugzilla.kernel.org/show_bug.cgi?id=16015

Reported-by: Justin P. Mattock <justinmattock@gmail.com>
CC: <stable@kernel.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 424e576f3acb..6bf8b2c06c7d 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -975,7 +975,7 @@ static irqreturn_t yenta_probe_handler(int irq, void *dev_id)
 /* probes the PCI interrupt, use only on override functions */
 static int yenta_probe_cb_irq(struct yenta_socket *socket)
 {
-        u8 reg;
+        u8 reg = 0;
 
         if (!socket->cb_irq)
                 return -1;
@@ -989,7 +989,8 @@ static int yenta_probe_cb_irq(struct yenta_socket *socket)
         }
 
         /* generate interrupt, wait */
-        reg = exca_readb(socket, I365_CSCINT);
+        if (!socket->dev->irq)
+                reg = exca_readb(socket, I365_CSCINT);
         exca_writeb(socket, I365_CSCINT, reg | I365_CSC_STSCHG);
         cb_writel(socket, CB_SOCKET_EVENT, -1);
         cb_writel(socket, CB_SOCKET_MASK, CB_CSTSMASK);