block: autoconvert trivial BKL users to private mutex

The block device drivers have all gained new lock_kernel
calls from a recent pushdown, and some of the drivers
were already using the BKL before.

This turns the BKL into a set of per-driver mutexes.
Still need to check whether this is safe to do.

file=$1
name=$2
if grep -q lock_kernel ${file} ; then
    if grep -q 'include.*linux.mutex.h' ${file} ; then
            sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
    else
            sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
    fi
    sed -i ${file} \
        -e "/^#include.*linux.mutex.h/,$ {
                1,/^\(static\|int\|long\)/ {
                     /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);

} }"  \
    -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
    -e '/[      ]*cycle_kernel_lock();/d'
else
    sed -i -e '/include.*\<smp_lock.h\>/d' ${file}  \
                -e '/cycle_kernel_lock()/d'
fi

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 6124c2fd2d3..ba9c3a4947c 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -26,7 +26,6 @@
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/major.h>
 #include <linux/fs.h>
@@ -66,6 +65,7 @@ MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
 MODULE_VERSION("3.6.26");
 MODULE_LICENSE("GPL");
 
+static DEFINE_MUTEX(cciss_mutex);
 static int cciss_allow_hpsa;
 module_param(cciss_allow_hpsa, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(cciss_allow_hpsa,
@@ -1059,9 +1059,9 @@ static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&cciss_mutex);
         ret = cciss_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&cciss_mutex);
 
         return ret;
 }
@@ -1074,13 +1074,13 @@ static int cciss_release(struct gendisk *disk, fmode_t mode)
         ctlr_info_t *h;
         drive_info_struct *drv;
 
-        lock_kernel();
+        mutex_lock(&cciss_mutex);
         h = get_host(disk);
         drv = get_drv(disk);
         dev_dbg(&h->pdev->dev, "cciss_release %s\n", disk->disk_name);
         drv->usage_count--;
         h->usage_count--;
-        unlock_kernel();
+        mutex_unlock(&cciss_mutex);
         return 0;
 }
 
@@ -1088,9 +1088,9 @@ static int do_ioctl(struct block_device *bdev, fmode_t mode,
                     unsigned cmd, unsigned long arg)
 {
         int ret;
-        lock_kernel();
+        mutex_lock(&cciss_mutex);
         ret = cciss_ioctl(bdev, mode, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&cciss_mutex);
         return ret;
 }