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| author | Jonathan Corbet <corbet@lwn.net> | 2008-05-15 11:04:19 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-20 14:05:48 -0600 |
| commit | 1f439647a4072ec64bb2e4b9290cd7be6aee8328 (patch) | |
| tree | 3ffcaa8ff39ea1324fe60bbc4fd35c6f77141083 | |
| parent | ecc38983f6c83f371fefb5a69a72e358fc7b1218 (diff) | |
| download | linux-1f439647a4072ec64bb2e4b9290cd7be6aee8328.tar.gz linux-1f439647a4072ec64bb2e4b9290cd7be6aee8328.tar.bz2 linux-1f439647a4072ec64bb2e4b9290cd7be6aee8328.zip | |
mem: cdev lock_kernel() pushdown
It's really hard to tell if this is necessary - lots of weird
magic happens by way of map_devmem()
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| -rw-r--r-- | drivers/char/mem.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 934ffafedaea..070e22e8ea9e 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -26,6 +26,7 @@ #include <linux/bootmem.h> #include <linux/splice.h> #include <linux/pfn.h> +#include <linux/smp_lock.h> #include <asm/uaccess.h> #include <asm/io.h> @@ -889,6 +890,9 @@ static const struct file_operations kmsg_fops = { static int memory_open(struct inode * inode, struct file * filp) { + int ret = 0; + + lock_kernel(); switch (iminor(inode)) { case 1: filp->f_op = &mem_fops; @@ -932,11 +936,13 @@ static int memory_open(struct inode * inode, struct file * filp) break; #endif default: + unlock_kernel(); return -ENXIO; } if (filp->f_op && filp->f_op->open) - return filp->f_op->open(inode,filp); - return 0; + ret = filp->f_op->open(inode,filp); + unlock_kernel(); + return ret; } static const struct file_operations memory_fops = { |