From patchwork Wed Oct 27 12:30:32 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 285612 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id o9RCVAPv006400 for ; Wed, 27 Oct 2010 12:31:12 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761021Ab0J0Mao (ORCPT ); Wed, 27 Oct 2010 08:30:44 -0400 Received: from moutng.kundenserver.de ([212.227.126.171]:49243 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755906Ab0J0Man (ORCPT ); Wed, 27 Oct 2010 08:30:43 -0400 Received: from klappe2.localnet (deibp9eh1--blueice3n2.emea.ibm.com [195.212.29.180]) by mrelayeu.kundenserver.de (node=mreu0) with ESMTP (Nemesis) id 0LapiO-1OieCx1WTg-00kN85; Wed, 27 Oct 2010 14:30:35 +0200 From: Arnd Bergmann To: Mauro Carvalho Chehab Subject: [PATCH, RFC] v4l: kill the BKL Date: Wed, 27 Oct 2010 14:30:32 +0200 User-Agent: KMail/1.12.2 (Linux/2.6.35-16-generic; KDE/4.3.2; x86_64; ; ) Cc: linux-media@vger.kernel.org, Hans Verkuil , linux-kernel@vger.kernel.org MIME-Version: 1.0 Message-Id: <201010271430.33034.arnd@arndb.de> X-Provags-ID: V02:K0:IctP0tJLgKTS+jpqFgWvo4HFOUxaQENMS3KckPWj0H5 oZkpysvVwkWUg2GJA1Fpqe++WQuZ9Jdlj165nB5jkawYeuCULv Sy3rAx8/ELojRfEWHOGRzSoLQQZRWg0SIRyAdZsRuV4WlnLpZu 9y/pvFsS7nGp3B5/gkNhGxkSiXugaGphRb198MCdoAJgw+cToN ZsYlHP23659FXPfTfOj5A== Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Wed, 27 Oct 2010 12:31:12 +0000 (UTC) diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig index bad2ced..a28541b 100644 --- a/drivers/media/Kconfig +++ b/drivers/media/Kconfig @@ -19,7 +19,6 @@ comment "Multimedia core support" config VIDEO_DEV tristate "Video For Linux" - depends on BKL # used in many drivers for ioctl handling, need to kill ---help--- V4L core support for video capture and overlay devices, webcams and AM/FM radio cards. diff --git a/drivers/media/video/cx231xx/cx231xx-417.c b/drivers/media/video/cx231xx/cx231xx-417.c index aab21f3..4c7cac3 100644 --- a/drivers/media/video/cx231xx/cx231xx-417.c +++ b/drivers/media/video/cx231xx/cx231xx-417.c @@ -31,7 +31,6 @@ #include #include #include -#include #include #include #include @@ -1927,10 +1926,9 @@ static int mpeg_open(struct file *file) dev = h; } - if (dev == NULL) { - unlock_kernel(); + if (dev == NULL) return -ENODEV; - } + mutex_lock(&dev->lock); /* allocate + initialize per filehandle data */ diff --git a/drivers/media/video/cx23885/cx23885-417.c b/drivers/media/video/cx23885/cx23885-417.c index a6cc12f..9a98dc5 100644 --- a/drivers/media/video/cx23885/cx23885-417.c +++ b/drivers/media/video/cx23885/cx23885-417.c @@ -31,7 +31,6 @@ #include #include #include -#include #include #include #include @@ -1576,12 +1575,8 @@ static int mpeg_open(struct file *file) /* allocate + initialize per filehandle data */ fh = kzalloc(sizeof(*fh), GFP_KERNEL); - if (NULL == fh) { - unlock_kernel(); + if (!fh) return -ENOMEM; - } - - lock_kernel(); file->private_data = fh; fh->dev = dev; @@ -1592,8 +1587,6 @@ static int mpeg_open(struct file *file) V4L2_FIELD_INTERLACED, sizeof(struct cx23885_buffer), fh, NULL); - unlock_kernel(); - return 0; } diff --git a/drivers/media/video/cx23885/cx23885-video.c b/drivers/media/video/cx23885/cx23885-video.c index 93af9c6..3cc9f46 100644 --- a/drivers/media/video/cx23885/cx23885-video.c +++ b/drivers/media/video/cx23885/cx23885-video.c @@ -26,7 +26,6 @@ #include #include #include -#include #include #include #include @@ -743,8 +742,6 @@ static int video_open(struct file *file) if (NULL == fh) return -ENOMEM; - lock_kernel(); - file->private_data = fh; fh->dev = dev; fh->radio = radio; @@ -762,8 +759,6 @@ static int video_open(struct file *file) dprintk(1, "post videobuf_queue_init()\n"); - unlock_kernel(); - return 0; } diff --git a/drivers/media/video/se401.c b/drivers/media/video/se401.c index 41d0166..41360d7 100644 --- a/drivers/media/video/se401.c +++ b/drivers/media/video/se401.c @@ -31,7 +31,6 @@ static const char version[] = "0.24"; #include #include #include -#include #include #include #include "se401.h" @@ -951,9 +950,9 @@ static int se401_open(struct file *file) struct usb_se401 *se401 = (struct usb_se401 *)dev; int err = 0; - lock_kernel(); + mutex_lock(&se401->lock); if (se401->user) { - unlock_kernel(); + mutex_unlock(&se401->lock); return -EBUSY; } se401->fbuf = rvmalloc(se401->maxframesize * SE401_NUMFRAMES); @@ -962,7 +961,7 @@ static int se401_open(struct file *file) else err = -ENOMEM; se401->user = !err; - unlock_kernel(); + mutex_unlock(&se401->lock); return err; } diff --git a/drivers/media/video/stk-webcam.c b/drivers/media/video/stk-webcam.c index f07a0f6..b5afe5f 100644 --- a/drivers/media/video/stk-webcam.c +++ b/drivers/media/video/stk-webcam.c @@ -27,7 +27,6 @@ #include #include #include -#include #include #include @@ -673,14 +672,11 @@ static int v4l_stk_open(struct file *fp) vdev = video_devdata(fp); dev = vdev_to_camera(vdev); - lock_kernel(); if (dev == NULL || !is_present(dev)) { - unlock_kernel(); return -ENXIO; } fp->private_data = dev; usb_autopm_get_interface(dev->interface); - unlock_kernel(); return 0; } diff --git a/drivers/media/video/tlg2300/pd-main.c b/drivers/media/video/tlg2300/pd-main.c index 4555f4a..c91424c 100644 --- a/drivers/media/video/tlg2300/pd-main.c +++ b/drivers/media/video/tlg2300/pd-main.c @@ -36,7 +36,6 @@ #include #include #include -#include #include "vendorcmds.h" #include "pd-common.h" @@ -485,15 +484,11 @@ static void poseidon_disconnect(struct usb_interface *interface) /*unregister v4l2 device */ v4l2_device_unregister(&pd->v4l2_dev); - lock_kernel(); - { - pd_dvb_usb_device_exit(pd); - poseidon_fm_exit(pd); + pd_dvb_usb_device_exit(pd); + poseidon_fm_exit(pd); - poseidon_audio_free(pd); - pd_video_exit(pd); - } - unlock_kernel(); + poseidon_audio_free(pd); + pd_video_exit(pd); usb_set_intfdata(interface, NULL); kref_put(&pd->kref, poseidon_delete); diff --git a/drivers/media/video/usbvideo/vicam.c b/drivers/media/video/usbvideo/vicam.c index 5d6fd01..dc17cce 100644 --- a/drivers/media/video/usbvideo/vicam.c +++ b/drivers/media/video/usbvideo/vicam.c @@ -43,7 +43,6 @@ #include #include #include -#include #include #include #include @@ -483,29 +482,28 @@ vicam_open(struct file *file) return -EINVAL; } - /* the videodev_lock held above us protects us from - * simultaneous opens...for now. we probably shouldn't - * rely on this fact forever. + /* cam_lock/open_count protects us from simultaneous opens + * ... for now. we probably shouldn't rely on this fact forever. */ - lock_kernel(); + mutex_lock(&cam->cam_lock); if (cam->open_count > 0) { printk(KERN_INFO "vicam_open called on already opened camera"); - unlock_kernel(); + mutex_unlock(&cam->cam_lock); return -EBUSY; } cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL); if (!cam->raw_image) { - unlock_kernel(); + mutex_unlock(&cam->cam_lock); return -ENOMEM; } cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES); if (!cam->framebuf) { kfree(cam->raw_image); - unlock_kernel(); + mutex_unlock(&cam->cam_lock); return -ENOMEM; } @@ -513,10 +511,17 @@ vicam_open(struct file *file) if (!cam->cntrlbuf) { kfree(cam->raw_image); rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES); - unlock_kernel(); + mutex_unlock(&cam->cam_lock); return -ENOMEM; } + cam->needsDummyRead = 1; + cam->open_count++; + + file->private_data = cam; + mutex_unlock(&cam->cam_lock); + + // First upload firmware, then turn the camera on if (!cam->is_initialized) { @@ -527,12 +532,6 @@ vicam_open(struct file *file) set_camera_power(cam, 1); - cam->needsDummyRead = 1; - cam->open_count++; - - file->private_data = cam; - unlock_kernel(); - return 0; } diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index 0ca7978..03f7f46 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -25,7 +25,6 @@ #include #include #include -#include #include #include @@ -247,10 +246,12 @@ static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) mutex_unlock(vdev->lock); } else if (vdev->fops->ioctl) { /* TODO: convert all drivers to unlocked_ioctl */ - lock_kernel(); + static DEFINE_MUTEX(v4l2_ioctl_mutex); + + mutex_lock(&v4l2_ioctl_mutex); if (video_is_registered(vdev)) ret = vdev->fops->ioctl(filp, cmd, arg); - unlock_kernel(); + mutex_unlock(&v4l2_ioctl_mutex); } else ret = -ENOTTY; diff --git a/drivers/media/video/zoran/zoran.h b/drivers/media/video/zoran/zoran.h index 37fe161..27f0555 100644 --- a/drivers/media/video/zoran/zoran.h +++ b/drivers/media/video/zoran/zoran.h @@ -388,6 +388,7 @@ struct zoran { struct videocodec *vfe; /* video front end */ struct mutex resource_lock; /* prevent evil stuff */ + struct mutex other_lock; /* please merge with above */ u8 initialized; /* flag if zoran has been correctly initialized */ int user; /* number of current users */ diff --git a/drivers/media/video/zoran/zoran_card.c b/drivers/media/video/zoran/zoran_card.c index 0aac376..7e6d624 100644 --- a/drivers/media/video/zoran/zoran_card.c +++ b/drivers/media/video/zoran/zoran_card.c @@ -1227,6 +1227,7 @@ static int __devinit zoran_probe(struct pci_dev *pdev, snprintf(ZR_DEVNAME(zr), sizeof(ZR_DEVNAME(zr)), "MJPEG[%u]", zr->id); spin_lock_init(&zr->spinlock); mutex_init(&zr->resource_lock); + mutex_init(&zr->other_lock); if (pci_enable_device(pdev)) goto zr_unreg; pci_read_config_byte(zr->pci_dev, PCI_CLASS_REVISION, &zr->revision); diff --git a/drivers/media/video/zoran/zoran_driver.c b/drivers/media/video/zoran/zoran_driver.c index 401082b..04e916f 100644 --- a/drivers/media/video/zoran/zoran_driver.c +++ b/drivers/media/video/zoran/zoran_driver.c @@ -49,7 +49,6 @@ #include #include #include -#include #include #include #include @@ -913,7 +912,7 @@ static int zoran_open(struct file *file) dprintk(2, KERN_INFO "%s: %s(%s, pid=[%d]), users(-)=%d\n", ZR_DEVNAME(zr), __func__, current->comm, task_pid_nr(current), zr->user + 1); - lock_kernel(); + mutex_lock(&zr->other_lock); if (zr->user >= 2048) { dprintk(1, KERN_ERR "%s: too many users (%d) on device\n", @@ -963,14 +962,14 @@ static int zoran_open(struct file *file) file->private_data = fh; fh->zr = zr; zoran_open_init_session(fh); - unlock_kernel(); + mutex_unlock(&zr->other_lock); return 0; fail_fh: kfree(fh); fail_unlock: - unlock_kernel(); + mutex_unlock(&zr->other_lock); dprintk(2, KERN_INFO "%s: open failed (%d), users(-)=%d\n", ZR_DEVNAME(zr), res, zr->user); @@ -989,7 +988,7 @@ zoran_close(struct file *file) /* kernel locks (fs/device.c), so don't do that ourselves * (prevents deadlocks) */ - /*mutex_lock(&zr->resource_lock);*/ + mutex_lock(&zr->other_lock); zoran_close_end_session(fh); @@ -1023,6 +1022,7 @@ zoran_close(struct file *file) encoder_call(zr, video, s_routing, 2, 0, 0); } } + mutex_unlock(&zr->other_lock); file->private_data = NULL; kfree(fh->overlay_mask); @@ -3370,11 +3370,26 @@ static const struct v4l2_ioctl_ops zoran_ioctl_ops = { #endif }; +/* please use zr->resource_lock consistently and kill this wrapper */ +static long zoran_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct zoran_fh *fh = file->private_data; + struct zoran *zr = fh->zr; + int ret; + + mutex_lock(&zr->other_lock); + ret = video_ioctl2(file, cmd, arg); + mutex_unlock(&zr->other_lock); + + return ret; +} + static const struct v4l2_file_operations zoran_fops = { .owner = THIS_MODULE, .open = zoran_open, .release = zoran_close, - .ioctl = video_ioctl2, + .unlocked_ioctl = zoran_ioctl, .read = zoran_read, .write = zoran_write, .mmap = zoran_mmap,