diff options
Diffstat (limited to 'drivers/s390/char/hmcdrv_dev.c')
| -rw-r--r-- | drivers/s390/char/hmcdrv_dev.c | 25 |
1 files changed, 7 insertions, 18 deletions
diff --git a/drivers/s390/char/hmcdrv_dev.c b/drivers/s390/char/hmcdrv_dev.c index 8d50c894711f..04b938c5357f 100644 --- a/drivers/s390/char/hmcdrv_dev.c +++ b/drivers/s390/char/hmcdrv_dev.c @@ -14,8 +14,7 @@ * end read() the response. */ -#define KMSG_COMPONENT "hmcdrv" -#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt +#define pr_fmt(fmt) "hmcdrv: " fmt #include <linux/kernel.h> #include <linux/module.h> @@ -186,9 +185,6 @@ static loff_t hmcdrv_dev_seek(struct file *fp, loff_t pos, int whence) if (pos < 0) return -EINVAL; - if (fp->f_pos != pos) - ++fp->f_version; - fp->f_pos = pos; return pos; } @@ -247,24 +243,17 @@ static ssize_t hmcdrv_dev_write(struct file *fp, const char __user *ubuf, size_t len, loff_t *pos) { ssize_t retlen; + void *pdata; pr_debug("writing file '/dev/%pD' at pos. %lld with length %zd\n", fp, (long long) *pos, len); if (!fp->private_data) { /* first expect a cmd write */ - fp->private_data = kmalloc(len + 1, GFP_KERNEL); - - if (!fp->private_data) - return -ENOMEM; - - if (!copy_from_user(fp->private_data, ubuf, len)) { - ((char *)fp->private_data)[len] = '\0'; - return len; - } - - kfree(fp->private_data); - fp->private_data = NULL; - return -EFAULT; + pdata = memdup_user_nul(ubuf, len); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + fp->private_data = pdata; + return len; } retlen = hmcdrv_dev_transfer((char *) fp->private_data, |