This patch updates the vme_master and vme_slave structures to use
types with well defined size and to prevent the compiler from
inserting padding (between enable and vme_addr for one).
The original vme_master and vme_slave structs would be different
sizes and have different layouts depending on whether they were built
for a 32-bit or 64-bit system.
On x86 it is possible to have a 32-bit userspace and a 64-bit kernel.
In this type of environment, the userspace and kernel vme_user APIs
would disagree and prevent ioctls from executing (based on ioctl
signatures from _IOR and _IOW).
Signed-off-by: Aaron Sierra <asie...@xes-inc.com>
---
drivers/staging/vme/devices/vme_user.c | 1 +
drivers/staging/vme/devices/vme_user.h | 26 +++++++++++++-------------
2 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/staging/vme/devices/vme_user.c
b/drivers/staging/vme/devices/vme_user.c
index da7f759..e69f0cd 100644
--- a/drivers/staging/vme/devices/vme_user.c
+++ b/drivers/staging/vme/devices/vme_user.c
@@ -147,6 +147,7 @@ static const struct file_operations vme_user_fops = {
.write = vme_user_write,
.llseek = vme_user_llseek,
.unlocked_ioctl = vme_user_unlocked_ioctl,
+ .compat_ioctl = vme_user_unlocked_ioctl,
};
diff --git a/drivers/staging/vme/devices/vme_user.h
b/drivers/staging/vme/devices/vme_user.h
index 7d24cd6..6726a42 100644
--- a/drivers/staging/vme/devices/vme_user.h
+++ b/drivers/staging/vme/devices/vme_user.h
@@ -6,13 +6,13 @@
/*
* VMEbus Master Window Configuration Structure
*/
-struct vme_master {
- int enable; /* State of Window */
- unsigned long long vme_addr; /* Starting Address on the VMEbus */
- unsigned long long size; /* Window Size */
- u32 aspace; /* Address Space */
- u32 cycle; /* Cycle properties */
- u32 dwidth; /* Maximum Data Width */
+struct __attribute__((__packed__)) vme_master {
+ u32 enable; /* State of Window */
+ u64 vme_addr; /* Starting Address on the VMEbus */
+ u64 size; /* Window Size */
+ u32 aspace; /* Address Space */
+ u32 cycle; /* Cycle properties */
+ u32 dwidth; /* Maximum Data Width */
#if 0
char prefetchEnable; /* Prefetch Read Enable State */
int prefetchSize; /* Prefetch Read Size (Cache Lines) */
@@ -30,12 +30,12 @@ struct vme_master {
/* VMEbus Slave Window Configuration Structure */
-struct vme_slave {
- int enable; /* State of Window */
- unsigned long long vme_addr; /* Starting Address on the VMEbus */
- unsigned long long size; /* Window Size */
- u32 aspace; /* Address Space */
- u32 cycle; /* Cycle properties */
+struct __attribute__((__packed__)) vme_slave {
+ u32 enable; /* State of Window */
+ u64 vme_addr; /* Starting Address on the VMEbus */
+ u64 size; /* Window Size */
+ u32 aspace; /* Address Space */
+ u32 cycle; /* Cycle properties */
#if 0
char wrPostEnable; /* Write Post State */
char rmwLock; /* Lock PCI during RMW Cycles */
--
1.7.9.5
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