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authorArnd Bergmann <arnd@arndb.de>2010-07-11 23:18:52 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-07-22 11:10:29 -0700
commit8e2394a981b9258db47f8e223a550d46c6d40cc8 (patch)
tree1cf90b29486d1a2bcc42a1bc6e6ff1d8855f6a46 /drivers/staging/crystalhd
parent7ebc8760b38bb00c35fcf43dad438c2adcd7c328 (diff)
downloadlinaro-lsk-8e2394a981b9258db47f8e223a550d46c6d40cc8.tar.gz
Staging: 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/crystalhd')
-rw-r--r--drivers/staging/crystalhd/crystalhd_lnx.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/staging/crystalhd/crystalhd_lnx.c b/drivers/staging/crystalhd/crystalhd_lnx.c
index 60839690bee..fbb80f09a3d 100644
--- a/drivers/staging/crystalhd/crystalhd_lnx.c
+++ b/drivers/staging/crystalhd/crystalhd_lnx.c
@@ -15,11 +15,12 @@
along with this driver. If not, see <http://www.gnu.org/licenses/>.
***************************************************************************/
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/slab.h>
#include "crystalhd_lnx.h"
+static DEFINE_MUTEX(chd_dec_mutex);
static struct class *crystalhd_class;
static struct crystalhd_adp *g_adp_info;
@@ -277,16 +278,16 @@ static long chd_dec_ioctl(struct file *fd, unsigned int cmd, unsigned long ua)
return -ENODATA;
}
- lock_kernel();
+ mutex_lock(&chd_dec_mutex);
cproc = crystalhd_get_cmd_proc(&adp->cmds, cmd, uc);
if (!cproc) {
BCMLOG_ERR("Unhandled command: %d\n", cmd);
- unlock_kernel();
+ mutex_unlock(&chd_dec_mutex);
return -EINVAL;
}
ret = chd_dec_api_cmd(adp, ua, uc->uid, cmd, cproc);
- unlock_kernel();
+ mutex_unlock(&chd_dec_mutex);
return ret;
}