From: Emil Velikov <emil.l.velikov@gmail.com> To: Gustavo Padovan <gustavo@padovan.org> Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, devel@driverdev.osuosl.org, "Daniel Stone" <daniels@collabora.com>, "Daniel Vetter" <daniel.vetter@ffwll.ch>, "Riley Andrews" <riandrews@android.com>, "ML dri-devel" <dri-devel@lists.freedesktop.org>, "Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>, "Arve Hjønnevåg" <arve@android.com>, "Gustavo Padovan" <gustavo.padovan@collabora.co.uk>, "John Harrison" <John.C.Harrison@intel.com> Subject: Re: [PATCH v5 5/5] staging/android: add flags member to sync ioctl structs Date: Wed, 2 Mar 2016 09:38:34 +0000 [thread overview] Message-ID: <CACvgo50tLFe-GdiV1fP_C8M-pg9p=WqO+HC4UprY8jfks-2xzA@mail.gmail.com> (raw) In-Reply-To: <1456837981-31584-5-git-send-email-gustavo@padovan.org> On 1 March 2016 at 13:13, Gustavo Padovan <gustavo@padovan.org> wrote: > From: Gustavo Padovan <gustavo.padovan@collabora.co.uk> > > Play safe and add flags member to all structs. So we don't need to > break API or create new IOCTL in the future if new features that requires > flags arises. > > v2: check if flags are valid (zero, in this case) > > v3: return -EINVAL if flags are not zero'ed > > Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> > --- > drivers/staging/android/sync.c | 8 ++++++++ > drivers/staging/android/uapi/sync.h | 6 ++++++ > 2 files changed, 14 insertions(+) > > diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c > index 3604e453..3c265ed 100644 > --- a/drivers/staging/android/sync.c > +++ b/drivers/staging/android/sync.c > @@ -445,6 +445,11 @@ static long sync_file_ioctl_merge(struct sync_file *sync_file, > goto err_put_fd; > } > > + if (data.flags) { > + err = -EINVAL; > + goto err_put_fd; > + } > + > fence2 = sync_file_fdget(data.fd2); > if (!fence2) { > err = -ENOENT; > @@ -504,6 +509,9 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file, > if (copy_from_user(&in, (void __user *)arg, sizeof(in))) > return -EFAULT; > > + if (in.flags) > + return -EINVAL; > + > info = kzalloc(sizeof(*info), GFP_KERNEL); > if (!info) > return -ENOMEM; > diff --git a/drivers/staging/android/uapi/sync.h b/drivers/staging/android/uapi/sync.h > index a122bb5..11e2d28 100644 > --- a/drivers/staging/android/uapi/sync.h > +++ b/drivers/staging/android/uapi/sync.h > @@ -19,11 +19,13 @@ > * @fd2: file descriptor of second fence > * @name: name of new fence > * @fence: returns the fd of the new fence to userspace > + * @flags: merge_data flags > */ > struct sync_merge_data { > __s32 fd2; > char name[32]; > __s32 fence; > + __u32 flags; The comment from last round still stands, struct size must be multiple of 64bits. As is the struct will be broken whenever/if we decide to extend it. See [1] for an alternative wording. > }; > > /** > @@ -31,12 +33,14 @@ struct sync_merge_data { > * @obj_name: name of parent sync_timeline > * @driver_name: name of driver implementing the parent > * @status: status of the fence 0:active 1:signaled <0:error > + * @flags: fence_info flags > * @timestamp_ns: timestamp of status change in nanoseconds > */ > struct sync_fence_info { > char obj_name[32]; > char driver_name[32]; > __s32 status; > + __u32 flags; > __u64 timestamp_ns; > }; > > @@ -44,6 +48,7 @@ struct sync_fence_info { > * struct sync_file_info - data returned from fence info ioctl > * @name: name of fence > * @status: status of fence. 1: signaled 0:active <0:error > + * @flags: sync_file_info flags > * @num_fences number of fences in the sync_file > * @sync_fence_info: pointer to array of structs sync_fence_info with all > * fences in the sync_file > @@ -51,6 +56,7 @@ struct sync_fence_info { > struct sync_file_info { > char name[32]; > __s32 status; > + __u32 flags; > __u32 num_fences; > > __u64 sync_fence_info; Thanks for taking my suggestion and dropping len. Although I fear that we introduced a hole which we should be explicitly padded [2]. In both cases the pad should be checked for 0 and -EINVAL should be returned if that's not the case. This will allow us to potentially reuse in the future. Other than that I believe the series looks pretty much spot on. Cheers, Emil [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/ioctl/botching-up-ioctls.txt#n37 [2] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/ioctl/botching-up-ioctls.txt#n32
WARNING: multiple messages have this Message-ID (diff)
From: Emil Velikov <emil.l.velikov@gmail.com> To: Gustavo Padovan <gustavo@padovan.org> Cc: devel@driverdev.osuosl.org, "Daniel Stone" <daniels@collabora.com>, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>, "ML dri-devel" <dri-devel@lists.freedesktop.org>, "Riley Andrews" <riandrews@android.com>, "Arve Hjønnevåg" <arve@android.com>, "Daniel Vetter" <daniel.vetter@ffwll.ch>, "Gustavo Padovan" <gustavo.padovan@collabora.co.uk>, "John Harrison" <John.C.Harrison@intel.com> Subject: Re: [PATCH v5 5/5] staging/android: add flags member to sync ioctl structs Date: Wed, 2 Mar 2016 09:38:34 +0000 [thread overview] Message-ID: <CACvgo50tLFe-GdiV1fP_C8M-pg9p=WqO+HC4UprY8jfks-2xzA@mail.gmail.com> (raw) In-Reply-To: <1456837981-31584-5-git-send-email-gustavo@padovan.org> On 1 March 2016 at 13:13, Gustavo Padovan <gustavo@padovan.org> wrote: > From: Gustavo Padovan <gustavo.padovan@collabora.co.uk> > > Play safe and add flags member to all structs. So we don't need to > break API or create new IOCTL in the future if new features that requires > flags arises. > > v2: check if flags are valid (zero, in this case) > > v3: return -EINVAL if flags are not zero'ed > > Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> > --- > drivers/staging/android/sync.c | 8 ++++++++ > drivers/staging/android/uapi/sync.h | 6 ++++++ > 2 files changed, 14 insertions(+) > > diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c > index 3604e453..3c265ed 100644 > --- a/drivers/staging/android/sync.c > +++ b/drivers/staging/android/sync.c > @@ -445,6 +445,11 @@ static long sync_file_ioctl_merge(struct sync_file *sync_file, > goto err_put_fd; > } > > + if (data.flags) { > + err = -EINVAL; > + goto err_put_fd; > + } > + > fence2 = sync_file_fdget(data.fd2); > if (!fence2) { > err = -ENOENT; > @@ -504,6 +509,9 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file, > if (copy_from_user(&in, (void __user *)arg, sizeof(in))) > return -EFAULT; > > + if (in.flags) > + return -EINVAL; > + > info = kzalloc(sizeof(*info), GFP_KERNEL); > if (!info) > return -ENOMEM; > diff --git a/drivers/staging/android/uapi/sync.h b/drivers/staging/android/uapi/sync.h > index a122bb5..11e2d28 100644 > --- a/drivers/staging/android/uapi/sync.h > +++ b/drivers/staging/android/uapi/sync.h > @@ -19,11 +19,13 @@ > * @fd2: file descriptor of second fence > * @name: name of new fence > * @fence: returns the fd of the new fence to userspace > + * @flags: merge_data flags > */ > struct sync_merge_data { > __s32 fd2; > char name[32]; > __s32 fence; > + __u32 flags; The comment from last round still stands, struct size must be multiple of 64bits. As is the struct will be broken whenever/if we decide to extend it. See [1] for an alternative wording. > }; > > /** > @@ -31,12 +33,14 @@ struct sync_merge_data { > * @obj_name: name of parent sync_timeline > * @driver_name: name of driver implementing the parent > * @status: status of the fence 0:active 1:signaled <0:error > + * @flags: fence_info flags > * @timestamp_ns: timestamp of status change in nanoseconds > */ > struct sync_fence_info { > char obj_name[32]; > char driver_name[32]; > __s32 status; > + __u32 flags; > __u64 timestamp_ns; > }; > > @@ -44,6 +48,7 @@ struct sync_fence_info { > * struct sync_file_info - data returned from fence info ioctl > * @name: name of fence > * @status: status of fence. 1: signaled 0:active <0:error > + * @flags: sync_file_info flags > * @num_fences number of fences in the sync_file > * @sync_fence_info: pointer to array of structs sync_fence_info with all > * fences in the sync_file > @@ -51,6 +56,7 @@ struct sync_fence_info { > struct sync_file_info { > char name[32]; > __s32 status; > + __u32 flags; > __u32 num_fences; > > __u64 sync_fence_info; Thanks for taking my suggestion and dropping len. Although I fear that we introduced a hole which we should be explicitly padded [2]. In both cases the pad should be checked for 0 and -EINVAL should be returned if that's not the case. This will allow us to potentially reuse in the future. Other than that I believe the series looks pretty much spot on. Cheers, Emil [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/ioctl/botching-up-ioctls.txt#n37 [2] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/ioctl/botching-up-ioctls.txt#n32 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2016-03-02 9:38 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-03-01 13:12 [PATCH v5 1/5] staging/android: add num_fences field to struct sync_file_info Gustavo Padovan 2016-03-01 13:12 ` Gustavo Padovan 2016-03-01 13:12 ` [PATCH v5 2/5] staging/android: rename SYNC_IOC_FENCE_INFO Gustavo Padovan 2016-03-01 13:12 ` Gustavo Padovan 2016-03-01 13:12 ` [PATCH v5 3/5] staging/android: remove redundant comments on sync_merge_data Gustavo Padovan 2016-03-01 13:12 ` Gustavo Padovan 2016-03-01 13:13 ` [PATCH v5 4/5] staging/android: refactor SYNC_IOC_FILE_INFO Gustavo Padovan 2016-03-01 13:13 ` Gustavo Padovan 2016-03-01 13:13 ` [PATCH v5 5/5] staging/android: add flags member to sync ioctl structs Gustavo Padovan 2016-03-01 13:13 ` Gustavo Padovan 2016-03-02 9:38 ` Emil Velikov [this message] 2016-03-02 9:38 ` Emil Velikov 2016-03-02 19:50 ` Gustavo Padovan 2016-03-02 19:50 ` Gustavo Padovan
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