From patchwork Fri Nov 11 13:55:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 9423065 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2E89860484 for ; Fri, 11 Nov 2016 13:56:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 21BE229B06 for ; Fri, 11 Nov 2016 13:56:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1675F29B08; Fri, 11 Nov 2016 13:56:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4170029B06 for ; Fri, 11 Nov 2016 13:56:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756633AbcKKNzz convert rfc822-to-8bit (ORCPT ); Fri, 11 Nov 2016 08:55:55 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:40193 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756260AbcKKNzx (ORCPT ); Fri, 11 Nov 2016 08:55:53 -0500 Received: from [152.253.7.148] (helo=smtp.w2.samsung.com) by bombadil.infradead.org with esmtpsa (Exim 4.85_2 #1 (Red Hat Linux)) id 1c5CJ0-0004G8-0S; Fri, 11 Nov 2016 13:55:47 +0000 Received: from localhost ([127.0.0.1] helo=vela.lan) by smtp.w2.samsung.com with esmtp (Exim 4.87) (envelope-from ) id 1c5CIu-0001On-N7; Fri, 11 Nov 2016 11:55:40 -0200 Date: Fri, 11 Nov 2016 11:55:35 -0200 From: Mauro Carvalho Chehab To: =?UTF-8?B?SsO2cmc=?= Otte , Benjamin Larsson Cc: Mauro Carvalho Chehab , Linus Torvalds , Patrick Boettcher , Mauro Carvalho Chehab , Linux Kernel Mailing List , Linux Media Mailing List Subject: Re: [v4.9-rc4] dvb-usb/cinergyT2 NULL pointer dereference Message-ID: <20161111115535.6aebf1e2@vela.lan> In-Reply-To: References: <20161108182215.41f1f3d2@vento.lan> <20161110064047.1e0a6b4b@vento.lan> X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Em Thu, 10 Nov 2016 12:15:39 +0100 Jörg Otte escreveu: > 2016-11-10 9:40 GMT+01:00 Mauro Carvalho Chehab : > > Em Wed, 9 Nov 2016 11:07:35 -0800 > > Linus Torvalds escreveu: > > > >> On Wed, Nov 9, 2016 at 3:09 AM, Jörg Otte wrote: > >> > > >> > Tried patch with no success. Again a NULL ptr dereferece. > >> > >> I suspect a much simpler approach is to just miove the "data_mutex" > >> away from the priv area and into "struct dvb_usb_device" and > >> "dvb_usb_adapter". Sure, that grows those structures a tiny bit, and > >> not every driver may need that mutex, but it simplifies things > >> enormously. Mauro? > >> > >> Linus > The patch works for me. Thanks for testing! That's the (hopefully) final version of it, with the fix applied to the other dvb-usb drivers that use data_mutex (except for the frontend ones, with uses a different private structure, and where the mutex is initialized at attach). Benjamin, Could you please test it? Thanks! Mauro - [PATCH] dvb-usb: move data_mutex to struct dvb_usb_device The data_mutex is initialized too late, as it is needed for each device driver's power control, causing an OOPS: dvb-usb: found a 'TerraTec/qanu USB2.0 Highspeed DVB-T Receiver' in warm state. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] __mutex_lock_slowpath+0x6f/0x100 PGD 0 Oops: 0002 [#1] SMP Modules linked in: dvb_usb_cinergyT2(+) dvb_usb CPU: 0 PID: 2029 Comm: modprobe Not tainted 4.9.0-rc4-dvbmod #24 Hardware name: FUJITSU LIFEBOOK A544/FJNBB35 , BIOS Version 1.17 05/09/2014 task: ffff88020e943840 task.stack: ffff8801f36ec000 RIP: 0010:[] [] __mutex_lock_slowpath+0x6f/0x100 RSP: 0018:ffff8801f36efb10 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff88021509bdc8 RCX: 00000000c0000100 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88021509bdcc RBP: ffff8801f36efb58 R08: ffff88021f216320 R09: 0000000000100000 R10: ffff88021f216320 R11: 00000023fee6c5a1 R12: ffff88020e943840 R13: ffff88021509bdcc R14: 00000000ffffffff R15: ffff88021509bdd0 FS: 00007f21adb86740(0000) GS:ffff88021f200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000215bce000 CR4: 00000000001406f0 Stack: ffff88021509bdd0 0000000000000000 0000000000000000 ffffffffc0137c80 ffff88021509bdc8 ffff8801f5944000 0000000000000001 ffffffffc0136b00 ffff880213e52000 ffff88021509bdc8 ffffffff84661856 ffff88021509bd80 Call Trace: [] ? mutex_lock+0x16/0x25 [] ? cinergyt2_power_ctrl+0x1f/0x60 [dvb_usb_cinergyT2] [] ? dvb_usb_device_init+0x21e/0x5d0 [dvb_usb] [] ? cinergyt2_usb_probe+0x21/0x50 [dvb_usb_cinergyT2] [] ? usb_probe_interface+0xf3/0x2a0 [] ? driver_probe_device+0x208/0x2b0 [] ? __driver_attach+0x87/0x90 [] ? driver_probe_device+0x2b0/0x2b0 [] ? bus_for_each_dev+0x52/0x80 [] ? bus_add_driver+0x1a3/0x220 [] ? driver_register+0x56/0xd0 [] ? usb_register_driver+0x77/0x130 [] ? 0xffffffffc013a000 [] ? do_one_initcall+0x46/0x180 [] ? free_vmap_area_noflush+0x38/0x70 [] ? kmem_cache_alloc+0x84/0xc0 [] ? do_init_module+0x50/0x1be [] ? load_module+0x1d8b/0x2100 [] ? find_symbol_in_section+0xa0/0xa0 [] ? SyS_finit_module+0x89/0x90 [] ? entry_SYSCALL_64_fastpath+0x13/0x94 Code: e8 a7 1d 00 00 8b 03 83 f8 01 0f 84 97 00 00 00 48 8b 43 10 4c 8d 7b 08 48 89 63 10 4c 89 3c 24 41 be ff ff ff ff 48 89 44 24 08 <48> 89 20 4c 89 64 24 10 eb 1a 49 c7 44 24 08 02 00 00 00 c6 43 RIP [] __mutex_lock_slowpath+0x6f/0x100 RSP CR2: 0000000000000000 So, move it to the struct dvb_usb_device and initialize it before calling the driver's callbacks. Reported-by: Jörg Otte Signed-off-by: Mauro Carvalho Chehab --- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/media/usb/dvb-usb/af9005.c b/drivers/media/usb/dvb-usb/af9005.c index b257780fb380..7853261906b1 100644 --- a/drivers/media/usb/dvb-usb/af9005.c +++ b/drivers/media/usb/dvb-usb/af9005.c @@ -53,7 +53,6 @@ struct af9005_device_state { u8 sequence; int led_state; unsigned char data[256]; - struct mutex data_mutex; }; static int af9005_generic_read_write(struct dvb_usb_device *d, u16 reg, @@ -72,7 +71,7 @@ static int af9005_generic_read_write(struct dvb_usb_device *d, u16 reg, return -EINVAL; } - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = 14; /* rest of buffer length low */ st->data[1] = 0; /* rest of buffer length high */ @@ -140,7 +139,7 @@ static int af9005_generic_read_write(struct dvb_usb_device *d, u16 reg, values[i] = st->data[8 + i]; ret: - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -481,7 +480,7 @@ int af9005_send_command(struct dvb_usb_device *d, u8 command, u8 * wbuf, } packet_len = wlen + 5; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = (u8) (packet_len & 0xff); st->data[1] = (u8) ((packet_len & 0xff00) >> 8); @@ -512,7 +511,7 @@ int af9005_send_command(struct dvb_usb_device *d, u8 command, u8 * wbuf, rbuf[i] = st->data[i + 7]; } - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -523,7 +522,7 @@ int af9005_read_eeprom(struct dvb_usb_device *d, u8 address, u8 * values, u8 seq; int ret, i; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); memset(st->data, 0, sizeof(st->data)); @@ -559,7 +558,7 @@ int af9005_read_eeprom(struct dvb_usb_device *d, u8 address, u8 * values, for (i = 0; i < len; i++) values[i] = st->data[6 + i]; } - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -847,7 +846,7 @@ static int af9005_rc_query(struct dvb_usb_device *d, u32 * event, int *state) return 0; } - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); /* deb_info("rc_query\n"); */ st->data[0] = 3; /* rest of packet length low */ @@ -890,7 +889,7 @@ static int af9005_rc_query(struct dvb_usb_device *d, u32 * event, int *state) } ret: - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -1004,20 +1003,8 @@ static struct dvb_usb_device_properties af9005_properties; static int af9005_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { - struct dvb_usb_device *d; - struct af9005_device_state *st; - int ret; - - ret = dvb_usb_device_init(intf, &af9005_properties, - THIS_MODULE, &d, adapter_nr); - - if (ret < 0) - return ret; - - st = d->priv; - mutex_init(&st->data_mutex); - - return 0; + return dvb_usb_device_init(intf, &af9005_properties, + THIS_MODULE, NULL, adapter_nr); } enum af9005_usb_table_entry { diff --git a/drivers/media/usb/dvb-usb/cinergyT2-core.c b/drivers/media/usb/dvb-usb/cinergyT2-core.c index 8ac825413d5a..290275bc7fde 100644 --- a/drivers/media/usb/dvb-usb/cinergyT2-core.c +++ b/drivers/media/usb/dvb-usb/cinergyT2-core.c @@ -42,7 +42,6 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr); struct cinergyt2_state { u8 rc_counter; unsigned char data[64]; - struct mutex data_mutex; }; /* We are missing a release hook with usb_device data */ @@ -56,12 +55,12 @@ static int cinergyt2_streaming_ctrl(struct dvb_usb_adapter *adap, int enable) struct cinergyt2_state *st = d->priv; int ret; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = CINERGYT2_EP1_CONTROL_STREAM_TRANSFER; st->data[1] = enable ? 1 : 0; ret = dvb_usb_generic_rw(d, st->data, 2, st->data, 64, 0); - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -71,12 +70,12 @@ static int cinergyt2_power_ctrl(struct dvb_usb_device *d, int enable) struct cinergyt2_state *st = d->priv; int ret; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = CINERGYT2_EP1_SLEEP_MODE; st->data[1] = enable ? 0 : 1; ret = dvb_usb_generic_rw(d, st->data, 2, st->data, 3, 0); - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -89,7 +88,7 @@ static int cinergyt2_frontend_attach(struct dvb_usb_adapter *adap) adap->fe_adap[0].fe = cinergyt2_fe_attach(adap->dev); - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = CINERGYT2_EP1_GET_FIRMWARE_VERSION; ret = dvb_usb_generic_rw(d, st->data, 1, st->data, 3, 0); @@ -97,7 +96,7 @@ static int cinergyt2_frontend_attach(struct dvb_usb_adapter *adap) deb_rc("cinergyt2_power_ctrl() Failed to retrieve sleep " "state info\n"); } - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); /* Copy this pointer as we are gonna need it in the release phase */ cinergyt2_usb_device = adap->dev; @@ -166,7 +165,7 @@ static int cinergyt2_rc_query(struct dvb_usb_device *d, u32 *event, int *state) *state = REMOTE_NO_KEY_PRESSED; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = CINERGYT2_EP1_GET_RC_EVENTS; ret = dvb_usb_generic_rw(d, st->data, 1, st->data, 5, 0); @@ -202,29 +201,17 @@ static int cinergyt2_rc_query(struct dvb_usb_device *d, u32 *event, int *state) } ret: - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } static int cinergyt2_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { - struct dvb_usb_device *d; - struct cinergyt2_state *st; - int ret; - - ret = dvb_usb_device_init(intf, &cinergyt2_properties, - THIS_MODULE, &d, adapter_nr); - if (ret < 0) - return ret; - - st = d->priv; - mutex_init(&st->data_mutex); - - return 0; + return dvb_usb_device_init(intf, &cinergyt2_properties, + THIS_MODULE, NULL, adapter_nr); } - static struct usb_device_id cinergyt2_usb_table[] = { { USB_DEVICE(USB_VID_TERRATEC, 0x0038) }, { 0 } diff --git a/drivers/media/usb/dvb-usb/cxusb.c b/drivers/media/usb/dvb-usb/cxusb.c index 39772812269d..243403081fa5 100644 --- a/drivers/media/usb/dvb-usb/cxusb.c +++ b/drivers/media/usb/dvb-usb/cxusb.c @@ -68,7 +68,7 @@ static int cxusb_ctrl_msg(struct dvb_usb_device *d, wo = (rbuf == NULL || rlen == 0); /* write-only */ - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = cmd; memcpy(&st->data[1], wbuf, wlen); if (wo) @@ -77,7 +77,7 @@ static int cxusb_ctrl_msg(struct dvb_usb_device *d, ret = dvb_usb_generic_rw(d, st->data, 1 + wlen, rbuf, rlen, 0); - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -1461,43 +1461,36 @@ static struct dvb_usb_device_properties cxusb_mygica_t230_properties; static int cxusb_probe(struct usb_interface *intf, const struct usb_device_id *id) { - struct dvb_usb_device *d; - struct cxusb_state *st; - if (0 == dvb_usb_device_init(intf, &cxusb_medion_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_lgh064f_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_dee1601_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_lgz201_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_dtt7579_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_dualdig4_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_nano2_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_nano2_needsfirmware_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_aver_a868r_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_bluebird_dualdig4_rev2_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_d680_dmb_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_mygica_d689_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &cxusb_mygica_t230_properties, - THIS_MODULE, &d, adapter_nr) || - 0) { - st = d->priv; - mutex_init(&st->data_mutex); - + THIS_MODULE, NULL, adapter_nr) || + 0) return 0; - } return -EINVAL; } diff --git a/drivers/media/usb/dvb-usb/cxusb.h b/drivers/media/usb/dvb-usb/cxusb.h index 9f3ee0e47d5c..18acda19527a 100644 --- a/drivers/media/usb/dvb-usb/cxusb.h +++ b/drivers/media/usb/dvb-usb/cxusb.h @@ -37,7 +37,6 @@ struct cxusb_state { struct i2c_client *i2c_client_tuner; unsigned char data[MAX_XFER_SIZE]; - struct mutex data_mutex; }; #endif diff --git a/drivers/media/usb/dvb-usb/dtt200u.c b/drivers/media/usb/dvb-usb/dtt200u.c index f88572c7ae7c..fcbff7fb0c4e 100644 --- a/drivers/media/usb/dvb-usb/dtt200u.c +++ b/drivers/media/usb/dvb-usb/dtt200u.c @@ -22,7 +22,6 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr); struct dtt200u_state { unsigned char data[80]; - struct mutex data_mutex; }; static int dtt200u_power_ctrl(struct dvb_usb_device *d, int onoff) @@ -30,23 +29,24 @@ static int dtt200u_power_ctrl(struct dvb_usb_device *d, int onoff) struct dtt200u_state *st = d->priv; int ret = 0; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = SET_INIT; if (onoff) ret = dvb_usb_generic_write(d, st->data, 2); - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } static int dtt200u_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff) { - struct dtt200u_state *st = adap->dev->priv; + struct dvb_usb_device *d = adap->dev; + struct dtt200u_state *st = d->priv; int ret; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = SET_STREAMING; st->data[1] = onoff; @@ -61,26 +61,27 @@ static int dtt200u_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff) ret = dvb_usb_generic_write(adap->dev, st->data, 1); ret: - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } static int dtt200u_pid_filter(struct dvb_usb_adapter *adap, int index, u16 pid, int onoff) { - struct dtt200u_state *st = adap->dev->priv; + struct dvb_usb_device *d = adap->dev; + struct dtt200u_state *st = d->priv; int ret; pid = onoff ? pid : 0; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = SET_PID_FILTER; st->data[1] = index; st->data[2] = pid & 0xff; st->data[3] = (pid >> 8) & 0x1f; ret = dvb_usb_generic_write(adap->dev, st->data, 4); - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -91,7 +92,7 @@ static int dtt200u_rc_query(struct dvb_usb_device *d) u32 scancode; int ret; - mutex_lock(&st->data_mutex); + mutex_lock(&d->data_mutex); st->data[0] = GET_RC_CODE; ret = dvb_usb_generic_rw(d, st->data, 1, st->data, 5, 0); @@ -126,7 +127,7 @@ static int dtt200u_rc_query(struct dvb_usb_device *d) deb_info("st->data: %*ph\n", 5, st->data); ret: - mutex_unlock(&st->data_mutex); + mutex_unlock(&d->data_mutex); return ret; } @@ -145,24 +146,17 @@ static struct dvb_usb_device_properties wt220u_miglia_properties; static int dtt200u_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { - struct dvb_usb_device *d; - struct dtt200u_state *st; - if (0 == dvb_usb_device_init(intf, &dtt200u_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &wt220u_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &wt220u_fc_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &wt220u_zl0353_properties, - THIS_MODULE, &d, adapter_nr) || + THIS_MODULE, NULL, adapter_nr) || 0 == dvb_usb_device_init(intf, &wt220u_miglia_properties, - THIS_MODULE, &d, adapter_nr)) { - st = d->priv; - mutex_init(&st->data_mutex); - + THIS_MODULE, NULL, adapter_nr)) return 0; - } return -ENODEV; } diff --git a/drivers/media/usb/dvb-usb/dvb-usb-init.c b/drivers/media/usb/dvb-usb/dvb-usb-init.c index 3896ba9a4179..84308569e7dc 100644 --- a/drivers/media/usb/dvb-usb/dvb-usb-init.c +++ b/drivers/media/usb/dvb-usb/dvb-usb-init.c @@ -142,6 +142,7 @@ static int dvb_usb_init(struct dvb_usb_device *d, short *adapter_nums) { int ret = 0; + mutex_init(&d->data_mutex); mutex_init(&d->usb_mutex); mutex_init(&d->i2c_mutex); diff --git a/drivers/media/usb/dvb-usb/dvb-usb.h b/drivers/media/usb/dvb-usb/dvb-usb.h index 1448c3d27ea2..67f898b6f6d0 100644 --- a/drivers/media/usb/dvb-usb/dvb-usb.h +++ b/drivers/media/usb/dvb-usb/dvb-usb.h @@ -404,8 +404,12 @@ struct dvb_usb_adapter { * Powered is in/decremented for each call to modify the state. * @udev: pointer to the device's struct usb_device. * - * @usb_mutex: semaphore of USB control messages (reading needs two messages) - * @i2c_mutex: semaphore for i2c-transfers + * @data_mutex: mutex to protect the data structure used to store URB data + * @usb_mutex: mutex of USB control messages (reading needs two messages). + * Please notice that this mutex is used internally at the generic + * URB control functions. So, drivers using dvb_usb_generic_rw() and + * derivated functions should not lock it internally. + * @i2c_mutex: mutex for i2c-transfers * * @i2c_adap: device's i2c_adapter if it uses I2CoverUSB * @@ -433,6 +437,7 @@ struct dvb_usb_device { int powered; /* locking */ + struct mutex data_mutex; struct mutex usb_mutex; /* i2c */