1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c
index 6e53ab606e9..29da4413ad4 100644
--- a/drivers/s390/block/dasd_eer.c
+++ b/drivers/s390/block/dasd_eer.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/poll.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/atomic.h>
@@ -525,6 +526,7 @@ static int dasd_eer_open(struct inode *inp, struct file *filp)
         eerb = kzalloc(sizeof(struct eerbuffer), GFP_KERNEL);
         if (!eerb)
                 return -ENOMEM;
+        lock_kernel();
         eerb->buffer_page_count = eer_pages;
         if (eerb->buffer_page_count < 1 ||
             eerb->buffer_page_count > INT_MAX / PAGE_SIZE) {
@@ -532,6 +534,7 @@ static int dasd_eer_open(struct inode *inp, struct file *filp)
                 MESSAGE(KERN_WARNING, "can't open device since module "
                         "parameter eer_pages is smaller then 1 or"
                         " bigger then %d", (int)(INT_MAX / PAGE_SIZE));
+                unlock_kernel();
                 return -EINVAL;
         }
         eerb->buffersize = eerb->buffer_page_count * PAGE_SIZE;
@@ -539,12 +542,14 @@ static int dasd_eer_open(struct inode *inp, struct file *filp)
                                GFP_KERNEL);
         if (!eerb->buffer) {
                 kfree(eerb);
+                unlock_kernel();
                 return -ENOMEM;
         }
         if (dasd_eer_allocate_buffer_pages(eerb->buffer,
                                            eerb->buffer_page_count)) {
                 kfree(eerb->buffer);
                 kfree(eerb);
+                unlock_kernel();
                 return -ENOMEM;
         }
         filp->private_data = eerb;
@@ -552,6 +557,7 @@ static int dasd_eer_open(struct inode *inp, struct file *filp)
         list_add(&eerb->list, &bufferlist);
         spin_unlock_irqrestore(&bufferlock, flags);
 
+        unlock_kernel();
         return nonseekable_open(inp,filp);
 }