Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 102 insertions, 95 deletions

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 48788db4e280..f54dab8acdcd 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
- *  Added devfs support. 
+ *  Added devfs support.
  *    Jan-11-1998, C. Scott Ananian <cananian@alumni.princeton.edu>
  *  Shared /dev/zero mmapping support, Feb 2000, Kanoj Sarcar <kanoj@sgi.com>
  */
@@ -44,36 +44,6 @@ static inline unsigned long size_inside_page(unsigned long start,
         return min(sz, size);
 }
 
-/*
- * Architectures vary in how they handle caching for addresses
- * outside of main memory.
- *
- */
-static inline int uncached_access(struct file *file, unsigned long addr)
-{
-#if defined(CONFIG_IA64)
-        /*
-         * On ia64, we ignore O_DSYNC because we cannot tolerate memory attribute aliases.
-         */
-        return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
-#elif defined(CONFIG_MIPS)
-        {
-                extern int __uncached_access(struct file *file,
-                                             unsigned long addr);
-
-                return __uncached_access(file, addr);
-        }
-#else
-        /*
-         * Accessing memory above the top the kernel knows about or through a file pointer
-         * that was marked O_DSYNC will be done non-cached.
-         */
-        if (file->f_flags & O_DSYNC)
-                return 1;
-        return addr >= __pa(high_memory);
-#endif
-}
-
 #ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
 static inline int valid_phys_addr_range(unsigned long addr, size_t count)
 {
@@ -115,15 +85,15 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
 }
 #endif
 
-void __attribute__((weak)) unxlate_dev_mem_ptr(unsigned long phys, void *addr)
+void __weak unxlate_dev_mem_ptr(unsigned long phys, void *addr)
 {
 }
 
 /*
- * This funcion reads the *physical* memory. The f_pos points directly to the 
- * memory location. 
+ * This funcion reads the *physical* memory. The f_pos points directly to the
+ * memory location.
  */
-static ssize_t read_mem(struct file * file, char __user * buf,
+static ssize_t read_mem(struct file *file, char __user *buf,
                         size_t count, loff_t *ppos)
 {
         unsigned long p = *ppos;
@@ -140,10 +110,10 @@ static ssize_t read_mem(struct file * file, char __user * buf,
                 if (sz > 0) {
                         if (clear_user(buf, sz))
                                 return -EFAULT;
-                        buf += sz; 
-                        p += sz; 
-                        count -= sz; 
-                        read += sz; 
+                        buf += sz;
+                        p += sz;
+                        count -= sz;
+                        read += sz;
                 }
         }
 #endif
@@ -157,9 +127,9 @@ static ssize_t read_mem(struct file * file, char __user * buf,
                         return -EPERM;
 
                 /*
-                 * On ia64 if a page has been mapped somewhere as
-                 * uncached, then it must also be accessed uncached
-                 * by the kernel or data corruption may occur
+                 * On ia64 if a page has been mapped somewhere as uncached, then
+                 * it must also be accessed uncached by the kernel or data
+                 * corruption may occur.
                  */
                 ptr = xlate_dev_mem_ptr(p);
                 if (!ptr)
@@ -180,7 +150,7 @@ static ssize_t read_mem(struct file * file, char __user * buf,
         return read;
 }
 
-static ssize_t write_mem(struct file * file, const char __user * buf, 
+static ssize_t write_mem(struct file *file, const char __user *buf,
                          size_t count, loff_t *ppos)
 {
         unsigned long p = *ppos;
@@ -212,9 +182,9 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
                         return -EPERM;
 
                 /*
-                 * On ia64 if a page has been mapped somewhere as
-                 * uncached, then it must also be accessed uncached
-                 * by the kernel or data corruption may occur
+                 * On ia64 if a page has been mapped somewhere as uncached, then
+                 * it must also be accessed uncached by the kernel or data
+                 * corruption may occur.
                  */
                 ptr = xlate_dev_mem_ptr(p);
                 if (!ptr) {
@@ -242,13 +212,48 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
         return written;
 }
 
-int __attribute__((weak)) phys_mem_access_prot_allowed(struct file *file,
+int __weak phys_mem_access_prot_allowed(struct file *file,
         unsigned long pfn, unsigned long size, pgprot_t *vma_prot)
 {
         return 1;
 }
 
 #ifndef __HAVE_PHYS_MEM_ACCESS_PROT
+
+/*
+ * Architectures vary in how they handle caching for addresses
+ * outside of main memory.
+ *
+ */
+#ifdef pgprot_noncached
+static int uncached_access(struct file *file, unsigned long addr)
+{
+#if defined(CONFIG_IA64)
+        /*
+         * On ia64, we ignore O_DSYNC because we cannot tolerate memory
+         * attribute aliases.
+         */
+        return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
+#elif defined(CONFIG_MIPS)
+        {
+                extern int __uncached_access(struct file *file,
+                                             unsigned long addr);
+
+                return __uncached_access(file, addr);
+        }
+#else
+        /*
+         * Accessing memory above the top the kernel knows about or through a
+         * file pointer
+         * that was marked O_DSYNC will be done non-cached.
+         */
+        if (file->f_flags & O_DSYNC)
+                return 1;
+        return addr >= __pa(high_memory);
+#endif
+}
+#endif
+
 static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
                                      unsigned long size, pgprot_t vma_prot)
 {
@@ -294,7 +299,7 @@ static const struct vm_operations_struct mmap_mem_ops = {
 #endif
 };
 
-static int mmap_mem(struct file * file, struct vm_area_struct * vma)
+static int mmap_mem(struct file *file, struct vm_area_struct *vma)
 {
         size_t size = vma->vm_end - vma->vm_start;
 
@@ -329,7 +334,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
 }
 
 #ifdef CONFIG_DEVKMEM
-static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
+static int mmap_kmem(struct file *file, struct vm_area_struct *vma)
 {
         unsigned long pfn;
 
@@ -337,9 +342,9 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
         pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT;
 
         /*
-         * RED-PEN: on some architectures there is more mapped memory
-         * than available in mem_map which pfn_valid checks
-         * for. Perhaps should add a new macro here.
+         * RED-PEN: on some architectures there is more mapped memory than
+         * available in mem_map which pfn_valid checks for. Perhaps should add a
+         * new macro here.
          *
          * RED-PEN: vmalloc is not supported right now.
          */
@@ -389,7 +394,7 @@ static ssize_t read_oldmem(struct file *file, char __user *buf,
 /*
  * This function reads the *virtual* memory as seen by the kernel.
  */
-static ssize_t read_kmem(struct file *file, char __user *buf, 
+static ssize_t read_kmem(struct file *file, char __user *buf,
                          size_t count, loff_t *ppos)
 {
         unsigned long p = *ppos;
@@ -400,8 +405,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
         read = 0;
         if (p < (unsigned long) high_memory) {
                 low_count = count;
-                if (count > (unsigned long) high_memory - p)
-                        low_count = (unsigned long) high_memory - p;
+                if (count > (unsigned long)high_memory - p)
+                        low_count = (unsigned long)high_memory - p;
 
 #ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
                 /* we don't have page 0 mapped on sparc and m68k.. */
@@ -465,9 +470,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
 }
 
 
-static inline ssize_t
-do_write_kmem(unsigned long p, const char __user *buf,
-              size_t count, loff_t *ppos)
+static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
+                                size_t count, loff_t *ppos)
 {
         ssize_t written, sz;
         unsigned long copied;
@@ -491,9 +495,9 @@ do_write_kmem(unsigned long p, const char __user *buf,
                 sz = size_inside_page(p, count);
 
                 /*
-                 * On ia64 if a page has been mapped somewhere as
-                 * uncached, then it must also be accessed uncached
-                 * by the kernel or data corruption may occur
+                 * On ia64 if a page has been mapped somewhere as uncached, then
+                 * it must also be accessed uncached by the kernel or data
+                 * corruption may occur.
                  */
                 ptr = xlate_dev_kmem_ptr((char *)p);
 
@@ -514,11 +518,10 @@ do_write_kmem(unsigned long p, const char __user *buf,
         return written;
 }
 
-
 /*
  * This function writes to the *virtual* memory as seen by the kernel.
  */
-static ssize_t write_kmem(struct file * file, const char __user * buf, 
+static ssize_t write_kmem(struct file *file, const char __user *buf,
                           size_t count, loff_t *ppos)
 {
         unsigned long p = *ppos;
@@ -570,17 +573,17 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
 #endif
 
 #ifdef CONFIG_DEVPORT
-static ssize_t read_port(struct file * file, char __user * buf,
+static ssize_t read_port(struct file *file, char __user *buf,
                          size_t count, loff_t *ppos)
 {
         unsigned long i = *ppos;
         char __user *tmp = buf;
 
         if (!access_ok(VERIFY_WRITE, buf, count))
-                return -EFAULT; 
+                return -EFAULT;
         while (count-- > 0 && i < 65536) {
-                if (__put_user(inb(i),tmp) < 0) 
-                        return -EFAULT;  
+                if (__put_user(inb(i), tmp) < 0)
+                        return -EFAULT;
                 i++;
                 tmp++;
         }
@@ -588,22 +591,22 @@ static ssize_t read_port(struct file * file, char __user * buf,
         return tmp-buf;
 }
 
-static ssize_t write_port(struct file * file, const char __user * buf,
+static ssize_t write_port(struct file *file, const char __user *buf,
                           size_t count, loff_t *ppos)
 {
         unsigned long i = *ppos;
         const char __user * tmp = buf;
 
-        if (!access_ok(VERIFY_READ,buf,count))
+        if (!access_ok(VERIFY_READ, buf, count))
                 return -EFAULT;
         while (count-- > 0 && i < 65536) {
                 char c;
                 if (__get_user(c, tmp)) {
                         if (tmp > buf)
                                 break;
-                        return -EFAULT; 
+                        return -EFAULT;
                 }
-                outb(c,i);
+                outb(c, i);
                 i++;
                 tmp++;
         }
@@ -612,13 +615,13 @@ static ssize_t write_port(struct file * file, const char __user * buf,
 }
 #endif
 
-static ssize_t read_null(struct file * file, char __user * buf,
+static ssize_t read_null(struct file *file, char __user *buf,
                          size_t count, loff_t *ppos)
 {
         return 0;
 }
 
-static ssize_t write_null(struct file * file, const char __user * buf,
+static ssize_t write_null(struct file *file, const char __user *buf,
                           size_t count, loff_t *ppos)
 {
         return count;
@@ -630,13 +633,13 @@ static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
         return sd->len;
 }
 
-static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out,
+static ssize_t splice_write_null(struct pipe_inode_info *pipe, struct file *out,
                                  loff_t *ppos, size_t len, unsigned int flags)
 {
         return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
 }
 
-static ssize_t read_zero(struct file * file, char __user * buf, 
+static ssize_t read_zero(struct file *file, char __user *buf,
                          size_t count, loff_t *ppos)
 {
         size_t written;
@@ -667,7 +670,7 @@ static ssize_t read_zero(struct file * file, char __user * buf,
         return written ? written : -EFAULT;
 }
 
-static int mmap_zero(struct file * file, struct vm_area_struct * vma)
+static int mmap_zero(struct file *file, struct vm_area_struct *vma)
 {
 #ifndef CONFIG_MMU
         return -ENOSYS;
@@ -677,7 +680,7 @@ static int mmap_zero(struct file * file, struct vm_area_struct * vma)
         return 0;
 }
 
-static ssize_t write_full(struct file * file, const char __user * buf,
+static ssize_t write_full(struct file *file, const char __user *buf,
                           size_t count, loff_t *ppos)
 {
         return -ENOSPC;
@@ -688,8 +691,7 @@ static ssize_t write_full(struct file * file, const char __user * buf,
  * can fopen() both devices with "a" now.  This was previously impossible.
  * -- SRB.
  */
-
-static loff_t null_lseek(struct file * file, loff_t offset, int orig)
+static loff_t null_lseek(struct file *file, loff_t offset, int orig)
 {
         return file->f_pos = 0;
 }
@@ -702,24 +704,26 @@ static loff_t null_lseek(struct file * file, loff_t offset, int orig)
  * also note that seeking relative to the "end of file" isn't supported:
  * it has no meaning, so it returns -EINVAL.
  */
-static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
+static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
 {
         loff_t ret;
 
         mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
         switch (orig) {
-                case 0:
-                        file->f_pos = offset;
-                        ret = file->f_pos;
-                        force_successful_syscall_return();
-                        break;
-                case 1:
-                        file->f_pos += offset;
-                        ret = file->f_pos;
-                        force_successful_syscall_return();
+        case SEEK_CUR:
+                offset += file->f_pos;
+        case SEEK_SET:
+                /* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
+                if ((unsigned long long)offset >= ~0xFFFULL) {
+                        ret = -EOVERFLOW;
                         break;
-                default:
-                        ret = -EINVAL;
+                }
+                file->f_pos = offset;
+                ret = file->f_pos;
+                force_successful_syscall_return();
+                break;
+        default:
+                ret = -EINVAL;
         }
         mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
         return ret;
@@ -803,7 +807,7 @@ static const struct file_operations oldmem_fops = {
 };
 #endif
 
-static ssize_t kmsg_write(struct file * file, const char __user * buf,
+static ssize_t kmsg_write(struct file *file, const char __user *buf,
                           size_t count, loff_t *ppos)
 {
         char *tmp;
@@ -825,7 +829,7 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
 }
 
 static const struct file_operations kmsg_fops = {
-        .write =        kmsg_write,
+        .write = kmsg_write,
 };
 
 static const struct memdev {
@@ -876,7 +880,7 @@ static int memory_open(struct inode *inode, struct file *filp)
 }
 
 static const struct file_operations memory_fops = {
-        .open           = memory_open,
+        .open = memory_open,
 };
 
 static char *mem_devnode(struct device *dev, mode_t *mode)
@@ -897,10 +901,13 @@ static int __init chr_dev_init(void)
         if (err)
                 return err;
 
-        if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
+        if (register_chrdev(MEM_MAJOR, "mem", &memory_fops))
                 printk("unable to get major %d for memory devs\n", MEM_MAJOR);
 
         mem_class = class_create(THIS_MODULE, "mem");
+        if (IS_ERR(mem_class))
+                return PTR_ERR(mem_class);
+
         mem_class->devnode = mem_devnode;
         for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
                 if (!devlist[minor].name)