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s390/cpum_cf: remove unnecessary copy_from_user call

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Struct s390_ctrset_read userdata is filled by ioctl_read operation
using put_user/copy_to_user. However, the ctrset->data value access
is not performed anywhere during the ioctl_read operation.
Remove unnecessary copy_from_user() call.
No functional change.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Suggested-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Thomas Richter 2023-03-31 11:42:20 +02:00 committed by Vasily Gorbik
parent 3cdf0269cd
commit 26300860c2
1 changed files with 1 additions and 5 deletions
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6
arch/s390/kernel/perf_cpum_cf.c
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@ -1388,14 +1388,10 @@ static int cfset_all_read(unsigned long arg, struct cfset_request *req)
static long cfset_ioctl_read(unsigned long arg, struct cfset_request *req)
{
struct s390_ctrset_read read;
int ret = -ENODATA;
if (req && req->ctrset) {
if (copy_from_user(&read, (char __user *)arg, sizeof(read)))
return -EFAULT;
if (req && req->ctrset)
ret = cfset_all_read(arg, req);
}
return ret;
}