[PATCH] I2O: new sysfs attributes and Adaptec specific block device access and 64-bit DMA support

Changes:
 - Added Bus-OSM which could be used by user space programs to reset a
   channel on the controller
 - Make ioctl's in Config-OSM obsolete in prefer for sysfs attributes and
   move those to its own file
 - Added sysfs attribute for firmware read and write access for I2O
   controllers
 - Added special handling of firmware read and write access for Adaptec
   controllers
 - Added vendor id and product id as sysfs-attribute to Executive classes
 - Added automatic notification of LCT change handling to Exec-OSM
 - Added flushing function to Block-OSM for later barrier implementation
 - Use PRIVATE messages for Block access on Adaptec controllers, which are
   faster then BLOCK class access
 - Cleaned up support for Promise controller
 - New messages are now detected using the IRQ status register as
   suggested by the I2O spec
 - Added i2o_dma_high() and i2o_dma_low() functions
 - Added facility for SG tablesize calculation when using 32-bit and
   64-bit DMA addresses
 - Added i2o_dma_map_single() and i2o_dma_map_sg() which could build the
   SG list for 32-bit as well as 64-bit DMA addresses

Signed-off-by: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/message/i2o/driver.c b/drivers/message/i2o/driver.c
index bebdd509b5d..393be8e2914 100644
--- a/drivers/message/i2o/driver.c
+++ b/drivers/message/i2o/driver.c
@@ -180,7 +180,13 @@ int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
 {
 	struct i2o_driver *drv;
 	struct i2o_message __iomem *msg = i2o_msg_out_to_virt(c, m);
-	u32 context = readl(&msg->u.s.icntxt);
+	u32 context;
+	unsigned long flags;
+
+	if(unlikely(!msg))
+		return -EIO;
+
+	context = readl(&msg->u.s.icntxt);
 
 	if (unlikely(context >= i2o_max_drivers)) {
 		osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
@@ -188,9 +194,9 @@ int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
 		return -EIO;
 	}
 
-	spin_lock(&i2o_drivers_lock);
+	spin_lock_irqsave(&i2o_drivers_lock, flags);
 	drv = i2o_drivers[context];
-	spin_unlock(&i2o_drivers_lock);
+	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
 
 	if (unlikely(!drv)) {
 		osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,