[PATCH] move rtc compat ioctl handling to fs/compat_ioctl.c

This patch implements generic handling of RTC_IRQP_READ32, RTC_IRQP_SET32,
RTC_EPOCH_READ32 and RTC_EPOCH_SET32 in fs/compat_ioctl.c.  It's based on the
x86_64 code which needed a little massaging to be endian-clean.

parisc used COMPAT_IOCTL or generic w_long handlers for these whichce is wrong
and can't work because the ioctls encode sizeof(unsigned long) in their ioctl
number.  parisc also duplicated COMPAT_IOCTL entries for other rtc ioctls
which I remove in this patch, too.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Matthew Wilcox <matthew@wil.cx>
Acked-by: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 47 insertions, 66 deletions

diff --git a/arch/parisc/kernel/ioctl32.c b/arch/parisc/kernel/ioctl32.c
index 4eada1bb27f0..805f31486cf9 100644
--- a/arch/parisc/kernel/ioctl32.c
+++ b/arch/parisc/kernel/ioctl32.c
@@ -36,25 +36,6 @@ HANDLE_IOCTL(SIOCGPPPSTATS, dev_ifsioc)
 HANDLE_IOCTL(SIOCGPPPCSTATS, dev_ifsioc)
 HANDLE_IOCTL(SIOCGPPPVER, dev_ifsioc)
 
-#if defined(CONFIG_GEN_RTC)
-COMPATIBLE_IOCTL(RTC_AIE_ON)
-COMPATIBLE_IOCTL(RTC_AIE_OFF)
-COMPATIBLE_IOCTL(RTC_UIE_ON)
-COMPATIBLE_IOCTL(RTC_UIE_OFF)
-COMPATIBLE_IOCTL(RTC_PIE_ON)
-COMPATIBLE_IOCTL(RTC_PIE_OFF)
-COMPATIBLE_IOCTL(RTC_WIE_ON)
-COMPATIBLE_IOCTL(RTC_WIE_OFF)
-COMPATIBLE_IOCTL(RTC_ALM_SET)   /* struct rtc_time only has ints */
-COMPATIBLE_IOCTL(RTC_ALM_READ)  /* struct rtc_time only has ints */
-COMPATIBLE_IOCTL(RTC_RD_TIME)   /* struct rtc_time only has ints */
-COMPATIBLE_IOCTL(RTC_SET_TIME)  /* struct rtc_time only has ints */
-HANDLE_IOCTL(RTC_IRQP_READ, w_long)
-COMPATIBLE_IOCTL(RTC_IRQP_SET)
-HANDLE_IOCTL(RTC_EPOCH_READ, w_long)
-COMPATIBLE_IOCTL(RTC_EPOCH_SET)
-#endif
-
 IOCTL_TABLE_END
 
 int ioctl_table_size = ARRAY_SIZE(ioctl_start);
diff --git a/arch/x86_64/ia32/ia32_ioctl.c b/arch/x86_64/ia32/ia32_ioctl.c
index e335bd0b637d..e11cc5699352 100644
--- a/arch/x86_64/ia32/ia32_ioctl.c
+++ b/arch/x86_64/ia32/ia32_ioctl.c
@@ -16,45 +16,6 @@
 
 #define CODE
 #include "compat_ioctl.c"
-  
-#define RTC_IRQP_READ32 _IOR('p', 0x0b, unsigned int)    /* Read IRQ rate   */
-#define RTC_IRQP_SET32  _IOW('p', 0x0c, unsigned int)    /* Set IRQ rate    */
-#define RTC_EPOCH_READ32        _IOR('p', 0x0d, unsigned)        /* Read epoch      */
-#define RTC_EPOCH_SET32         _IOW('p', 0x0e, unsigned)        /* Set epoch       */
-
-static int rtc32_ioctl(unsigned fd, unsigned cmd, unsigned long arg) 
-{ 
-        unsigned long val;
-        mm_segment_t oldfs = get_fs(); 
-        int ret; 
-        
-        switch (cmd) { 
-        case RTC_IRQP_READ32: 
-                set_fs(KERNEL_DS); 
-                ret = sys_ioctl(fd, RTC_IRQP_READ, (unsigned long)&val); 
-                set_fs(oldfs); 
-                if (!ret)
-                        ret = put_user(val, (unsigned int __user *) arg); 
-                return ret; 
-
-        case RTC_IRQP_SET32: 
-                cmd = RTC_IRQP_SET; 
-                break; 
-
-        case RTC_EPOCH_READ32:
-                set_fs(KERNEL_DS); 
-                ret = sys_ioctl(fd, RTC_EPOCH_READ, (unsigned long) &val); 
-                set_fs(oldfs); 
-                if (!ret)
-                        ret = put_user(val, (unsigned int __user *) arg); 
-                return ret; 
-
-        case RTC_EPOCH_SET32:
-                cmd = RTC_EPOCH_SET; 
-                break; 
-        } 
-        return sys_ioctl(fd,cmd,arg); 
-} 
 
 
 #define HANDLE_IOCTL(cmd,handler) { (cmd), (ioctl_trans_handler_t)(handler) }, 
@@ -64,14 +25,6 @@ struct ioctl_trans ioctl_start[] = {
 #include <linux/compat_ioctl.h>
 #define DECLARES
 #include "compat_ioctl.c"
-
-/* And these ioctls need translation */
-/* realtime device */
-HANDLE_IOCTL(RTC_IRQP_READ,  rtc32_ioctl)
-HANDLE_IOCTL(RTC_IRQP_READ32,rtc32_ioctl)
-HANDLE_IOCTL(RTC_IRQP_SET32, rtc32_ioctl)
-HANDLE_IOCTL(RTC_EPOCH_READ32, rtc32_ioctl)
-HANDLE_IOCTL(RTC_EPOCH_SET32, rtc32_ioctl)
 /* take care of sizeof(sizeof()) breakage */
 }; 
 
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 55d9a3a954cf..b9aeacc11c8f 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -2475,6 +2475,49 @@ static int old_bridge_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg
         return -EINVAL;
 }
 
+#define RTC_IRQP_READ32         _IOR('p', 0x0b, compat_ulong_t)
+#define RTC_IRQP_SET32          _IOW('p', 0x0c, compat_ulong_t)
+#define RTC_EPOCH_READ32        _IOR('p', 0x0d, compat_ulong_t)
+#define RTC_EPOCH_SET32         _IOW('p', 0x0e, compat_ulong_t)
+
+static int rtc_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
+{
+        mm_segment_t oldfs = get_fs();
+        compat_ulong_t val32;
+        unsigned long kval;
+        int ret;
+
+        switch (cmd) {
+        case RTC_IRQP_READ32:
+        case RTC_EPOCH_READ32:
+                set_fs(KERNEL_DS);
+                ret = sys_ioctl(fd, (cmd == RTC_IRQP_READ32) ?
+                                        RTC_IRQP_READ : RTC_EPOCH_READ,
+                                        (unsigned long)&kval);
+                set_fs(oldfs);
+                if (ret)
+                        return ret;
+                val32 = kval;
+                return put_user(val32, (unsigned int __user *)arg);
+        case RTC_IRQP_SET32:
+        case RTC_EPOCH_SET32:
+                ret = get_user(val32, (unsigned int __user *)arg);
+                if (ret)
+                        return ret;
+                kval = val32;
+
+                set_fs(KERNEL_DS);
+                ret = sys_ioctl(fd, (cmd == RTC_IRQP_SET32) ?
+                                RTC_IRQP_SET : RTC_EPOCH_SET,
+                                (unsigned long)&kval);
+                set_fs(oldfs);
+                return ret;
+        default:
+                /* unreached */
+                return -ENOIOCTLCMD;
+        }
+}
+
 #if defined(CONFIG_NCP_FS) || defined(CONFIG_NCP_FS_MODULE)
 struct ncp_ioctl_request_32 {
         u32 function;
@@ -2858,6 +2901,10 @@ HANDLE_IOCTL(SIOCSIWENCODE, do_wireless_ioctl)
 HANDLE_IOCTL(SIOCGIWENCODE, do_wireless_ioctl)
 HANDLE_IOCTL(SIOCSIFBR, old_bridge_ioctl)
 HANDLE_IOCTL(SIOCGIFBR, old_bridge_ioctl)
+HANDLE_IOCTL(RTC_IRQP_READ32, rtc_ioctl)
+HANDLE_IOCTL(RTC_IRQP_SET32, rtc_ioctl)
+HANDLE_IOCTL(RTC_EPOCH_READ32, rtc_ioctl)
+HANDLE_IOCTL(RTC_EPOCH_SET32, rtc_ioctl)
 
 #if defined(CONFIG_NCP_FS) || defined(CONFIG_NCP_FS_MODULE)
 HANDLE_IOCTL(NCP_IOC_NCPREQUEST_32, do_ncp_ncprequest)