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scsi: autoconvert trivial BKL users to private mutex

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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>
This commit is contained in:
Arnd Bergmann
2010-06-02 14:28:52 +02:00
parent 49553c2ef8
commit c45d15d24e
16 changed files with 86 additions and 85 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/scsi/dpt_i2o.c
View File

@@ -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;
}