scsi: autoconvert trivial BKL users to private mutex

All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.

None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.

Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.

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>
Cc: linux-scsi@vger.kernel.org
Cc: "James E.J. Bottomley" <James.Bottomley@suse.de>

1 files changed, 9 insertions, 9 deletions

diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index ffc1edf5e80d..410ac1def8a6 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -49,7 +49,6 @@ MODULE_DESCRIPTION("Adaptec I2O RAID Driver");
 #include <linux/kernel.h>       /* for printk */
 #include <linux/sched.h>
 #include <linux/reboot.h>
-#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/dma-mapping.h>
 
@@ -76,6 +75,7 @@ MODULE_DESCRIPTION("Adaptec I2O RAID Driver");
  * Needed for our management apps
  *============================================================================
  */
+static DEFINE_MUTEX(adpt_mutex);
 static dpt_sig_S DPTI_sig = {
         {'d', 'P', 't', 'S', 'i', 'G'}, SIG_VERSION,
 #ifdef __i386__
@@ -1732,12 +1732,12 @@ static int adpt_open(struct inode *inode, struct file *file)
         int minor;
         adpt_hba* pHba;
 
-        lock_kernel();
+        mutex_lock(&adpt_mutex);
         //TODO check for root access
         //
         minor = iminor(inode);
         if (minor >= hba_count) {
-                unlock_kernel();
+                mutex_unlock(&adpt_mutex);
                 return -ENXIO;
         }
         mutex_lock(&adpt_configuration_lock);
@@ -1748,7 +1748,7 @@ static int adpt_open(struct inode *inode, struct file *file)
         }
         if (pHba == NULL) {
                 mutex_unlock(&adpt_configuration_lock);
-                unlock_kernel();
+                mutex_unlock(&adpt_mutex);
                 return -ENXIO;
         }
 
@@ -1759,7 +1759,7 @@ static int adpt_open(struct inode *inode, struct file *file)
 
         pHba->in_use = 1;
         mutex_unlock(&adpt_configuration_lock);
-        unlock_kernel();
+        mutex_unlock(&adpt_mutex);
 
         return 0;
 }
@@ -2160,9 +2160,9 @@ static long adpt_unlocked_ioctl(struct file *file, uint cmd, ulong arg)
  
         inode = file->f_dentry->d_inode;
  
-        lock_kernel();
+        mutex_lock(&adpt_mutex);
         ret = adpt_ioctl(inode, file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&adpt_mutex);
 
         return ret;
 }
@@ -2176,7 +2176,7 @@ static long compat_adpt_ioctl(struct file *file,
  
         inode = file->f_dentry->d_inode;
  
-        lock_kernel();
+        mutex_lock(&adpt_mutex);
  
         switch(cmd) {
                 case DPT_SIGNATURE:
@@ -2194,7 +2194,7 @@ static long compat_adpt_ioctl(struct file *file,
                         ret =  -ENOIOCTLCMD;
         }
  
-        unlock_kernel();
+        mutex_unlock(&adpt_mutex);
  
         return ret;
 }