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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-29 18:22:04 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2018-06-01 19:18:27 +0200
commit929f45e32499171ce3e5a15db972256eac513ad7 (patch)
tree9318600392ccd531e866dd086fe3d2ec4ed2ec9c /virt/kvm/kvm_main.c
parentd1e5b0e98ea27b4f17871dc4e8ea4b0447e35221 (diff)
downloadlinux-929f45e32499171ce3e5a15db972256eac513ad7.tar.gz
kvm: no need to check return value of debugfs_create functions
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. This cleans up the error handling a lot, as this code will never get hit. Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim KrÄmář" <rkrcmar@redhat.com> Cc: Arvind Yadav <arvind.yadav.cs@gmail.com> Cc: Eric Auger <eric.auger@redhat.com> Cc: Andre Przywara <andre.przywara@arm.com> Cc: kvm-ppc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: kvmarm@lists.cs.columbia.edu Cc: kvm@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c40
1 files changed, 8 insertions, 32 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8938c9e553df..aa7da1d8ece2 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -590,10 +590,7 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
return 0;
snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
- kvm->debugfs_dentry = debugfs_create_dir(dir_name,
- kvm_debugfs_dir);
- if (!kvm->debugfs_dentry)
- return -ENOMEM;
+ kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
sizeof(*kvm->debugfs_stat_data),
@@ -609,11 +606,8 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
stat_data->kvm = kvm;
stat_data->offset = p->offset;
kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
- if (!debugfs_create_file(p->name, 0644,
- kvm->debugfs_dentry,
- stat_data,
- stat_fops_per_vm[p->kind]))
- return -ENOMEM;
+ debugfs_create_file(p->name, 0644, kvm->debugfs_dentry,
+ stat_data, stat_fops_per_vm[p->kind]);
}
return 0;
}
@@ -3919,29 +3913,18 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
kfree(env);
}
-static int kvm_init_debug(void)
+static void kvm_init_debug(void)
{
- int r = -EEXIST;
struct kvm_stats_debugfs_item *p;
kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
- if (kvm_debugfs_dir == NULL)
- goto out;
kvm_debugfs_num_entries = 0;
for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
- if (!debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
- (void *)(long)p->offset,
- stat_fops[p->kind]))
- goto out_dir;
+ debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
+ (void *)(long)p->offset,
+ stat_fops[p->kind]);
}
-
- return 0;
-
-out_dir:
- debugfs_remove_recursive(kvm_debugfs_dir);
-out:
- return r;
}
static int kvm_suspend(void)
@@ -4069,20 +4052,13 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
kvm_preempt_ops.sched_in = kvm_sched_in;
kvm_preempt_ops.sched_out = kvm_sched_out;
- r = kvm_init_debug();
- if (r) {
- pr_err("kvm: create debugfs files failed\n");
- goto out_undebugfs;
- }
+ kvm_init_debug();
r = kvm_vfio_ops_init();
WARN_ON(r);
return 0;
-out_undebugfs:
- unregister_syscore_ops(&kvm_syscore_ops);
- misc_deregister(&kvm_dev);
out_unreg:
kvm_async_pf_deinit();
out_free: