IB/qib: Use memdup_user() rather than duplicating its implementation

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/qib/qib_fs.c b/drivers/infiniband/hw/qib/qib_fs.c
index fcdf37913a264d52b5204f771523b37a2b0c4985..c3edc033f7c4ca674380930f958c3b6b60c0cb0f 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_fs.c
+++ b/drivers/infiniband/hw/qib/qib_fs.c
@@ -328,26 +328,12 @@ static ssize_t flash_write(struct file *file, const char __user *buf,
 
        pos = *ppos;
 
-       if (pos != 0) {
-               ret = -EINVAL;
-               goto bail;
-       }
-
-       if (count != sizeof(struct qib_flash)) {
-               ret = -EINVAL;
-               goto bail;
-       }
-
-       tmp = kmalloc(count, GFP_KERNEL);
-       if (!tmp) {
-               ret = -ENOMEM;
-               goto bail;
-       }
+       if (pos != 0 || count != sizeof(struct qib_flash))
+               return -EINVAL;
 
-       if (copy_from_user(tmp, buf, count)) {
-               ret = -EFAULT;
-               goto bail_tmp;
-       }
+       tmp = memdup_user(buf, count);
+       if (IS_ERR(tmp))
+               return PTR_ERR(tmp);
 
        dd = private2dd(file);
        if (qib_eeprom_write(dd, pos, tmp, count)) {
@@ -361,8 +347,6 @@ static ssize_t flash_write(struct file *file, const char __user *buf,
 
 bail_tmp:
        kfree(tmp);
-
-bail:
        return ret;
 }