aboutsummaryrefslogtreecommitdiff
path: root/drivers/char/mem.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/mem.c')
-rw-r--r--drivers/char/mem.c392
1 files changed, 196 insertions, 196 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index be832b6f827..917403fe10d 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>
*/
@@ -21,19 +21,21 @@
#include <linux/ptrace.h>
#include <linux/device.h>
#include <linux/highmem.h>
-#include <linux/crash_dump.h>
#include <linux/backing-dev.h>
-#include <linux/bootmem.h>
#include <linux/splice.h>
#include <linux/pfn.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/aio.h>
#include <asm/uaccess.h>
-#include <asm/io.h>
#ifdef CONFIG_IA64
# include <linux/efi.h>
#endif
+#define DEVPORT_MINOR 4
+
static inline unsigned long size_inside_page(unsigned long start,
unsigned long size)
{
@@ -44,43 +46,10 @@ 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)
+static inline int valid_phys_addr_range(phys_addr_t addr, size_t count)
{
- if (addr + count > __pa(high_memory))
- return 0;
-
- return 1;
+ return addr + count <= __pa(high_memory);
}
static inline int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
@@ -115,21 +84,24 @@ 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;
+ phys_addr_t p = *ppos;
ssize_t read, sz;
char *ptr;
+ if (p != *ppos)
+ return 0;
+
if (!valid_phys_addr_range(p, count))
return -EFAULT;
read = 0;
@@ -140,10 +112,10 @@ 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 +129,9 @@ 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)
@@ -180,14 +152,17 @@ 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;
+ phys_addr_t p = *ppos;
ssize_t written, sz;
unsigned long copied;
void *ptr;
+ if (p != *ppos)
+ return -EFBIG;
+
if (!valid_phys_addr_range(p, count))
return -EFAULT;
@@ -212,9 +187,9 @@ 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) {
@@ -242,18 +217,53 @@ 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, phys_addr_t 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)
{
#ifdef pgprot_noncached
- unsigned long offset = pfn << PAGE_SHIFT;
+ phys_addr_t offset = pfn << PAGE_SHIFT;
if (uncached_access(file, offset))
return pgprot_noncached(vma_prot);
@@ -294,7 +304,7 @@ 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;
@@ -317,7 +327,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
vma->vm_ops = &mmap_mem_ops;
- /* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
+ /* Remap-pfn-range will mark the range VM_IO */
if (remap_pfn_range(vma,
vma->vm_start,
vma->vm_pgoff,
@@ -329,7 +339,7 @@ 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 +347,9 @@ 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.
*/
@@ -351,56 +361,23 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
}
#endif
-#ifdef CONFIG_CRASH_DUMP
-/*
- * Read memory corresponding to the old kernel.
- */
-static ssize_t read_oldmem(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- unsigned long pfn, offset;
- size_t read = 0, csize;
- int rc = 0;
-
- while (count) {
- pfn = *ppos / PAGE_SIZE;
- if (pfn > saved_max_pfn)
- return read;
-
- offset = (unsigned long)(*ppos % PAGE_SIZE);
- if (count > PAGE_SIZE - offset)
- csize = PAGE_SIZE - offset;
- else
- csize = count;
-
- rc = copy_oldmem_page(pfn, buf, csize, offset, 1);
- if (rc < 0)
- return rc;
- buf += csize;
- *ppos += csize;
- read += csize;
- count -= csize;
- }
- return read;
-}
-#endif
-
#ifdef CONFIG_DEVKMEM
/*
* 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;
ssize_t low_count, read, sz;
- char * kbuf; /* k-addr because vread() takes vmlist_lock rwlock */
+ char *kbuf; /* k-addr because vread() takes vmlist_lock rwlock */
+ int err = 0;
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.. */
@@ -441,12 +418,16 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
return -ENOMEM;
while (count > 0) {
sz = size_inside_page(p, count);
+ if (!is_vmalloc_or_module_addr((void *)p)) {
+ err = -ENXIO;
+ break;
+ }
sz = vread(kbuf, (char *)p, sz);
if (!sz)
break;
if (copy_to_user(buf, kbuf, sz)) {
- free_page((unsigned long)kbuf);
- return -EFAULT;
+ err = -EFAULT;
+ break;
}
count -= sz;
buf += sz;
@@ -455,14 +436,13 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
}
free_page((unsigned long)kbuf);
}
- *ppos = p;
- return read;
+ *ppos = p;
+ return read ? read : err;
}
-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;
@@ -486,9 +466,9 @@ 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);
@@ -509,17 +489,17 @@ 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;
ssize_t wrote = 0;
ssize_t virtr = 0;
- char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
+ char *kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
+ int err = 0;
if (p < (unsigned long) high_memory) {
unsigned long to_write = min_t(unsigned long, count,
@@ -540,14 +520,16 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
unsigned long sz = size_inside_page(p, count);
unsigned long n;
+ if (!is_vmalloc_or_module_addr((void *)p)) {
+ err = -ENXIO;
+ break;
+ }
n = copy_from_user(kbuf, buf, sz);
if (n) {
- if (wrote + virtr)
- break;
- free_page((unsigned long)kbuf);
- return -EFAULT;
+ err = -EFAULT;
+ break;
}
- sz = vwrite(kbuf, (char *)p, sz);
+ vwrite(kbuf, (char *)p, sz);
count -= sz;
buf += sz;
virtr += sz;
@@ -556,23 +538,23 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
free_page((unsigned long)kbuf);
}
- *ppos = p;
- return virtr + wrote;
+ *ppos = p;
+ return virtr + wrote ? : err;
}
#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++;
}
@@ -580,22 +562,22 @@ 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;
+ 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++;
}
@@ -604,31 +586,43 @@ 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;
}
+static ssize_t aio_read_null(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ return 0;
+}
+
+static ssize_t aio_write_null(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ return iov_length(iov, nr_segs);
+}
+
static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
struct splice_desc *sd)
{
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;
@@ -659,7 +653,25 @@ 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 ssize_t aio_read_zero(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ size_t written = 0;
+ unsigned long i;
+ ssize_t ret;
+
+ for (i = 0; i < nr_segs; i++) {
+ ret = read_zero(iocb->ki_filp, iov[i].iov_base, iov[i].iov_len,
+ &pos);
+ if (ret < 0)
+ break;
+ written += ret;
+ }
+
+ return written ? written : -EFAULT;
+}
+
+static int mmap_zero(struct file *file, struct vm_area_struct *vma)
{
#ifndef CONFIG_MMU
return -ENOSYS;
@@ -669,7 +681,7 @@ 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;
@@ -680,8 +692,7 @@ 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;
}
@@ -694,30 +705,32 @@ 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);
+ mutex_lock(&file_inode(file)->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 (IS_ERR_VALUE((unsigned long long)offset)) {
+ 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);
+ mutex_unlock(&file_inode(file)->i_mutex);
return ret;
}
-static int open_port(struct inode * inode, struct file * filp)
+static int open_port(struct inode *inode, struct file *filp)
{
return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
}
@@ -726,9 +739,9 @@ static int open_port(struct inode * inode, struct file * filp)
#define full_lseek null_lseek
#define write_zero write_null
#define read_full read_zero
+#define aio_write_zero aio_write_null
#define open_mem open_port
#define open_kmem open_mem
-#define open_oldmem open_mem
static const struct file_operations mem_fops = {
.llseek = memory_lseek,
@@ -754,6 +767,8 @@ static const struct file_operations null_fops = {
.llseek = null_lseek,
.read = read_null,
.write = write_null,
+ .aio_read = aio_read_null,
+ .aio_write = aio_write_null,
.splice_write = splice_write_null,
};
@@ -770,16 +785,19 @@ static const struct file_operations zero_fops = {
.llseek = zero_lseek,
.read = read_zero,
.write = write_zero,
+ .aio_read = aio_read_zero,
+ .aio_write = aio_write_zero,
.mmap = mmap_zero,
};
/*
* capabilities for /dev/zero
* - permits private mappings, "copies" are taken of the source of zeros
+ * - no writeback happens
*/
static struct backing_dev_info zero_bdi = {
.name = "char/mem",
- .capabilities = BDI_CAP_MAP_COPY,
+ .capabilities = BDI_CAP_MAP_COPY | BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static const struct file_operations full_fops = {
@@ -788,41 +806,9 @@ static const struct file_operations full_fops = {
.write = write_full,
};
-#ifdef CONFIG_CRASH_DUMP
-static const struct file_operations oldmem_fops = {
- .read = read_oldmem,
- .open = open_oldmem,
-};
-#endif
-
-static ssize_t kmsg_write(struct file * file, const char __user * buf,
- size_t count, loff_t *ppos)
-{
- char *tmp;
- ssize_t ret;
-
- tmp = kmalloc(count + 1, GFP_KERNEL);
- if (tmp == NULL)
- return -ENOMEM;
- ret = -EFAULT;
- 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;
-}
-
-static const struct file_operations kmsg_fops = {
- .write = kmsg_write,
-};
-
static const struct memdev {
const char *name;
- mode_t mode;
+ umode_t mode;
const struct file_operations *fops;
struct backing_dev_info *dev_info;
} devlist[] = {
@@ -838,9 +824,8 @@ static const struct memdev {
[7] = { "full", 0666, &full_fops, NULL },
[8] = { "random", 0666, &random_fops, NULL },
[9] = { "urandom", 0666, &urandom_fops, NULL },
- [11] = { "kmsg", 0, &kmsg_fops, NULL },
-#ifdef CONFIG_CRASH_DUMP
- [12] = { "oldmem", 0, &oldmem_fops, NULL },
+#ifdef CONFIG_PRINTK
+ [11] = { "kmsg", 0644, &kmsg_fops, NULL },
#endif
};
@@ -861,6 +846,10 @@ static int memory_open(struct inode *inode, struct file *filp)
if (dev->dev_info)
filp->f_mapping->backing_dev_info = dev->dev_info;
+ /* Is /dev/mem or /dev/kmem ? */
+ if (dev->dev_info == &directly_mappable_cdev_bdi)
+ filp->f_mode |= FMODE_UNSIGNED_OFFSET;
+
if (dev->fops->open)
return dev->fops->open(inode, filp);
@@ -868,10 +857,11 @@ static int memory_open(struct inode *inode, struct file *filp)
}
static const struct file_operations memory_fops = {
- .open = memory_open,
+ .open = memory_open,
+ .llseek = noop_llseek,
};
-static char *mem_devnode(struct device *dev, mode_t *mode)
+static char *mem_devnode(struct device *dev, umode_t *mode)
{
if (mode && devlist[MINOR(dev->devt)].mode)
*mode = devlist[MINOR(dev->devt)].mode;
@@ -889,19 +879,29 @@ 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)
continue;
+
+ /*
+ * Create /dev/port?
+ */
+ if ((minor == DEVPORT_MINOR) && !arch_has_dev_port())
+ continue;
+
device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
NULL, devlist[minor].name);
}
- return 0;
+ return tty_init();
}
fs_initcall(chr_dev_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 06:49:46 +0000