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-rw-r--r--drivers/char/mem.c54
1 files changed, 36 insertions, 18 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 91dd669273e0..29c41f4418c0 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -101,6 +101,11 @@ static inline int valid_phys_addr_range(unsigned long addr, size_t *count)
return 1;
}
+
+static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t *size)
+{
+ return 1;
+}
#endif
/*
@@ -228,26 +233,36 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
return written;
}
+#ifndef __HAVE_PHYS_MEM_ACCESS_PROT
+static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+ unsigned long size, pgprot_t vma_prot)
+{
+#ifdef pgprot_noncached
+ unsigned long offset = pfn << PAGE_SHIFT;
+
+ if (uncached_access(file, offset))
+ return pgprot_noncached(vma_prot);
+#endif
+ return vma_prot;
+}
+#endif
+
static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
-#if defined(__HAVE_PHYS_MEM_ACCESS_PROT)
+ size_t size = vma->vm_end - vma->vm_start;
+
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, &size))
+ return -EINVAL;
+
vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
+ size,
vma->vm_page_prot);
-#elif defined(pgprot_noncached)
- unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- int uncached;
-
- uncached = uncached_access(file, offset);
- if (uncached)
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-#endif
/* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
if (remap_pfn_range(vma,
vma->vm_start,
vma->vm_pgoff,
- vma->vm_end-vma->vm_start,
+ size,
vma->vm_page_prot))
return -EAGAIN;
return 0;
@@ -519,7 +534,7 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
return virtr + wrote;
}
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
static ssize_t read_port(struct file * file, char __user * buf,
size_t count, loff_t *ppos)
{
@@ -726,7 +741,7 @@ static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
{
loff_t ret;
- down(&file->f_dentry->d_inode->i_sem);
+ mutex_lock(&file->f_dentry->d_inode->i_mutex);
switch (orig) {
case 0:
file->f_pos = offset;
@@ -741,7 +756,7 @@ static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
default:
ret = -EINVAL;
}
- up(&file->f_dentry->d_inode->i_sem);
+ mutex_unlock(&file->f_dentry->d_inode->i_mutex);
return ret;
}
@@ -780,7 +795,7 @@ static struct file_operations null_fops = {
.write = write_null,
};
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
static struct file_operations port_fops = {
.llseek = memory_lseek,
.read = read_port,
@@ -817,7 +832,7 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
size_t count, loff_t *ppos)
{
char *tmp;
- int ret;
+ ssize_t ret;
tmp = kmalloc(count + 1, GFP_KERNEL);
if (tmp == NULL)
@@ -826,6 +841,9 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
if (!copy_from_user(tmp, buf, count)) {
tmp[count] = 0;
ret = printk("%s", tmp);
+ if (ret > count)
+ /* printk can add a prefix */
+ ret = count;
}
kfree(tmp);
return ret;
@@ -847,7 +865,7 @@ static int memory_open(struct inode * inode, struct file * filp)
case 3:
filp->f_op = &null_fops;
break;
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
case 4:
filp->f_op = &port_fops;
break;
@@ -894,7 +912,7 @@ static const struct {
{1, "mem", S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops},
{2, "kmem", S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops},
{3, "null", S_IRUGO | S_IWUGO, &null_fops},
-#if (defined(CONFIG_ISA) || !defined(__mc68000__)) && (!defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI))
+#if defined(CONFIG_ISA) || !defined(__mc68000__)
{4, "port", S_IRUSR | S_IWUSR | S_IRGRP, &port_fops},
#endif
{5, "zero", S_IRUGO | S_IWUGO, &zero_fops},