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Fri, 29 Nov 2024 10:03:30 -0800 (PST) X-Google-Smtp-Source: AGHT+IFcaH98g/aKOXkcSAzeimGrYvz9gdVa/ULmk9tzYCDKi+YAb46/bKejxaa6n1dzchG/qIy62A== X-Received: by 2002:a17:907:93c1:b0:aa4:ce81:6d92 with SMTP id a640c23a62f3a-aa5810559abmr993043966b.38.1732903410235; Fri, 29 Nov 2024 10:03:30 -0800 (PST) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: philmd@linaro.org Subject: [PATCH 1/3] clock: clear callback on unparent Date: Fri, 29 Nov 2024 19:03:24 +0100 Message-ID: <20241129180326.722436-2-pbonzini@redhat.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241129180326.722436-1-pbonzini@redhat.com> References: <20241129180326.722436-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1732903485308019100 Content-Type: text/plain; charset="utf-8" Signed-off-by: Paolo Bonzini --- include/hw/clock.h | 8 -------- hw/core/clock.c | 22 +++++++++++++++++----- hw/core/qdev-clock.c | 5 +---- 3 files changed, 18 insertions(+), 17 deletions(-) diff --git a/include/hw/clock.h b/include/hw/clock.h index eb58599131c..a279bd4ba5e 100644 --- a/include/hw/clock.h +++ b/include/hw/clock.h @@ -141,14 +141,6 @@ Clock *clock_new(Object *parent, const char *name); void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque, unsigned int events); =20 -/** - * clock_clear_callback: - * @clk: the clock to delete the callback from - * - * Unregister the callback registered with clock_set_callback. - */ -void clock_clear_callback(Clock *clk); - /** * clock_set_source: * @clk: the clock. diff --git a/hw/core/clock.c b/hw/core/clock.c index cbe7b1bc469..391095eb4e5 100644 --- a/hw/core/clock.c +++ b/hw/core/clock.c @@ -44,16 +44,12 @@ Clock *clock_new(Object *parent, const char *name) void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque, unsigned int events) { + assert(OBJECT(clk)->parent); clk->callback =3D cb; clk->callback_opaque =3D opaque; clk->callback_events =3D events; } =20 -void clock_clear_callback(Clock *clk) -{ - clock_set_callback(clk, NULL, NULL, 0); -} - bool clock_set(Clock *clk, uint64_t period) { if (clk->period =3D=3D period) { @@ -168,6 +164,16 @@ static void clock_period_prop_get(Object *obj, Visitor= *v, const char *name, visit_type_uint64(v, name, &period, errp); } =20 +static void clock_unparent(Object *obj) +{ + /* + * Callback are registered by the parent, which might die anytime after + * it's unparented the children. Avoid having a callback to a deleted + * object in case the clock is still referenced somewhere else (eg: by + * a clock output). + */ + clock_set_callback(CLOCK(obj), NULL, NULL, 0); +} =20 static void clock_initfn(Object *obj) { @@ -200,11 +206,17 @@ static void clock_finalizefn(Object *obj) g_free(clk->canonical_path); } =20 +static void clock_class_init(ObjectClass *klass, void *data) +{ + klass->unparent =3D clock_unparent; +} + static const TypeInfo clock_info =3D { .name =3D TYPE_CLOCK, .parent =3D TYPE_OBJECT, .instance_size =3D sizeof(Clock), .instance_init =3D clock_initfn, + .class_init =3D clock_class_init, .instance_finalize =3D clock_finalizefn, }; =20 diff --git a/hw/core/qdev-clock.c b/hw/core/qdev-clock.c index 82799577f3e..ca65685c04e 100644 --- a/hw/core/qdev-clock.c +++ b/hw/core/qdev-clock.c @@ -87,11 +87,8 @@ void qdev_finalize_clocklist(DeviceState *dev) if (!ncl->output && !ncl->alias) { /* * We kept a reference on the input clock to ensure it lives u= p to - * this point so we can safely remove the callback. - * It avoids having a callback to a deleted object if ncl->clo= ck - * is still referenced somewhere else (eg: by a clock output). + * this point; it is used by the monitor to show the frequency. */ - clock_clear_callback(ncl->clock); object_unref(OBJECT(ncl->clock)); } g_free(ncl->name); --=20 2.47.0