From: Boris Ostrovsky <boris.ostrovsky@oracle.com> To: Oleksandr Andrushchenko <andr2000@gmail.com>, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, airlied@linux.ie, daniel.vetter@intel.com, seanpaul@chromium.org, gustavo@padovan.org, jgross@suse.com, konrad.wilk@oracle.com Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Subject: Re: [PATCH 5/9] drm/xen-front: Implement handling of shared display buffers Date: Thu, 22 Feb 2018 19:25:18 -0500 [thread overview] Message-ID: <11ce6c96-1739-435c-4b6f-c9f5d02a2905@oracle.com> (raw) In-Reply-To: <1519200222-20623-6-git-send-email-andr2000@gmail.com> On 02/21/2018 03:03 AM, Oleksandr Andrushchenko wrote: > > static int __init xen_drv_init(void) > { > + /* At the moment we only support case with XEN_PAGE_SIZE == PAGE_SIZE */ > + BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); Why BUILD_BUG_ON? This should simply not load if page sizes are different. > + ret = gnttab_map_refs(map_ops, NULL, buf->pages, buf->num_pages); > + BUG_ON(ret); We should try not to BUG*(). There are a few in this patch (and possibly others) that I think can be avoided. > + > +static int alloc_storage(struct xen_drm_front_shbuf *buf) > +{ > + if (buf->sgt) { > + buf->pages = kvmalloc_array(buf->num_pages, > + sizeof(struct page *), GFP_KERNEL); > + if (!buf->pages) > + return -ENOMEM; > + > + if (drm_prime_sg_to_page_addr_arrays(buf->sgt, buf->pages, > + NULL, buf->num_pages) < 0) > + return -EINVAL; > + } > + > + buf->grefs = kcalloc(buf->num_grefs, sizeof(*buf->grefs), GFP_KERNEL); > + if (!buf->grefs) > + return -ENOMEM; > + > + buf->directory = kcalloc(get_num_pages_dir(buf), PAGE_SIZE, GFP_KERNEL); > + if (!buf->directory) > + return -ENOMEM; You need to clean up on errors. -boris > + > + return 0; > +}
WARNING: multiple messages have this Message-ID (diff)
From: Boris Ostrovsky <boris.ostrovsky@oracle.com> To: Oleksandr Andrushchenko <andr2000@gmail.com>, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, airlied@linux.ie, daniel.vetter@intel.com, seanpaul@chromium.org, gustavo@padovan.org, jgross@suse.com, konrad.wilk@oracle.com Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Subject: Re: [PATCH 5/9] drm/xen-front: Implement handling of shared display buffers Date: Thu, 22 Feb 2018 19:25:18 -0500 [thread overview] Message-ID: <11ce6c96-1739-435c-4b6f-c9f5d02a2905@oracle.com> (raw) In-Reply-To: <1519200222-20623-6-git-send-email-andr2000@gmail.com> On 02/21/2018 03:03 AM, Oleksandr Andrushchenko wrote: > > static int __init xen_drv_init(void) > { > + /* At the moment we only support case with XEN_PAGE_SIZE == PAGE_SIZE */ > + BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); Why BUILD_BUG_ON? This should simply not load if page sizes are different. > + ret = gnttab_map_refs(map_ops, NULL, buf->pages, buf->num_pages); > + BUG_ON(ret); We should try not to BUG*(). There are a few in this patch (and possibly others) that I think can be avoided. > + > +static int alloc_storage(struct xen_drm_front_shbuf *buf) > +{ > + if (buf->sgt) { > + buf->pages = kvmalloc_array(buf->num_pages, > + sizeof(struct page *), GFP_KERNEL); > + if (!buf->pages) > + return -ENOMEM; > + > + if (drm_prime_sg_to_page_addr_arrays(buf->sgt, buf->pages, > + NULL, buf->num_pages) < 0) > + return -EINVAL; > + } > + > + buf->grefs = kcalloc(buf->num_grefs, sizeof(*buf->grefs), GFP_KERNEL); > + if (!buf->grefs) > + return -ENOMEM; > + > + buf->directory = kcalloc(get_num_pages_dir(buf), PAGE_SIZE, GFP_KERNEL); > + if (!buf->directory) > + return -ENOMEM; You need to clean up on errors. -boris > + > + return 0; > +} _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
next prev parent reply other threads:[~2018-02-23 0:24 UTC|newest] Thread overview: 165+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-02-21 8:03 [PATCH 0/9] drm/xen-front: Add support for Xen PV display frontend Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 1/9] drm/xen-front: Introduce Xen para-virtualized frontend driver Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:19 ` Juergen Gross 2018-02-21 8:19 ` Juergen Gross 2018-02-21 8:47 ` Oleksandr Andrushchenko 2018-02-21 8:47 ` Oleksandr Andrushchenko 2018-02-21 8:47 ` Oleksandr Andrushchenko 2018-02-21 9:09 ` Juergen Gross 2018-02-21 9:09 ` Juergen Gross 2018-02-21 9:11 ` Oleksandr Andrushchenko 2018-02-21 9:11 ` Oleksandr Andrushchenko 2018-02-21 9:11 ` Oleksandr Andrushchenko 2018-02-21 9:17 ` [Xen-devel] " Roger Pau Monné 2018-02-21 9:17 ` Roger Pau Monné 2018-02-21 9:42 ` [Xen-devel] " Oleksandr Andrushchenko 2018-02-21 9:42 ` Oleksandr Andrushchenko 2018-02-21 10:19 ` Roger Pau Monné 2018-02-21 10:19 ` Roger Pau Monné 2018-02-21 10:25 ` Oleksandr Andrushchenko 2018-02-21 10:25 ` [Xen-devel] " Oleksandr Andrushchenko 2018-02-21 10:25 ` Oleksandr Andrushchenko 2018-02-21 9:42 ` Oleksandr Andrushchenko 2018-02-22 22:23 ` Boris Ostrovsky 2018-02-22 22:23 ` Boris Ostrovsky 2018-02-23 6:37 ` Oleksandr Andrushchenko 2018-02-23 6:37 ` Oleksandr Andrushchenko 2018-02-23 14:39 ` Boris Ostrovsky 2018-02-23 14:39 ` Boris Ostrovsky 2018-02-23 14:51 ` Oleksandr Andrushchenko 2018-02-23 14:51 ` Oleksandr Andrushchenko 2018-02-23 14:51 ` Oleksandr Andrushchenko 2018-02-23 6:37 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 2/9] drm/xen-front: Implement Xen bus state handling Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:23 ` Juergen Gross 2018-02-21 8:23 ` Juergen Gross 2018-02-21 8:50 ` Oleksandr Andrushchenko 2018-02-21 8:50 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 3/9] drm/xen-front: Read driver configuration from Xen store Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-22 23:20 ` Boris Ostrovsky 2018-02-22 23:20 ` Boris Ostrovsky 2018-02-23 6:46 ` Oleksandr Andrushchenko 2018-02-23 6:46 ` Oleksandr Andrushchenko 2018-02-23 6:46 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 4/9] drm/xen-front: Implement Xen event channel handling Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-22 23:50 ` Boris Ostrovsky 2018-02-22 23:50 ` Boris Ostrovsky 2018-02-23 7:00 ` Oleksandr Andrushchenko 2018-02-23 7:00 ` Oleksandr Andrushchenko 2018-02-23 7:00 ` Oleksandr Andrushchenko 2018-02-23 14:44 ` Boris Ostrovsky 2018-02-23 14:44 ` Boris Ostrovsky 2018-02-23 14:49 ` Oleksandr Andrushchenko 2018-02-23 14:49 ` Oleksandr Andrushchenko 2018-02-23 14:49 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 5/9] drm/xen-front: Implement handling of shared display buffers Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-23 0:25 ` Boris Ostrovsky [this message] 2018-02-23 0:25 ` Boris Ostrovsky 2018-02-23 7:53 ` Oleksandr Andrushchenko 2018-02-23 7:53 ` Oleksandr Andrushchenko 2018-02-23 14:36 ` Boris Ostrovsky 2018-02-23 14:36 ` Boris Ostrovsky 2018-02-23 14:45 ` Oleksandr Andrushchenko 2018-02-23 14:45 ` Oleksandr Andrushchenko 2018-02-23 14:45 ` Oleksandr Andrushchenko 2018-02-23 7:53 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 6/9] drm/xen-front: Introduce DRM/KMS virtual display driver Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-23 15:12 ` Boris Ostrovsky 2018-02-23 15:12 ` Boris Ostrovsky 2018-02-23 15:19 ` Oleksandr Andrushchenko 2018-02-23 15:19 ` Oleksandr Andrushchenko 2018-02-23 15:19 ` Oleksandr Andrushchenko 2018-03-05 9:13 ` Daniel Vetter 2018-03-05 9:13 ` Daniel Vetter 2018-03-05 9:19 ` Oleksandr Andrushchenko 2018-03-05 9:19 ` Oleksandr Andrushchenko 2018-03-05 9:19 ` Oleksandr Andrushchenko 2018-03-05 9:13 ` Daniel Vetter 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 7/9] drm/xen-front: Implement KMS/connector handling Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-03-05 9:23 ` Daniel Vetter 2018-03-05 9:23 ` Daniel Vetter 2018-03-05 12:59 ` Oleksandr Andrushchenko 2018-03-05 12:59 ` Oleksandr Andrushchenko 2018-03-06 7:22 ` Daniel Vetter 2018-03-06 7:22 ` Daniel Vetter 2018-03-06 7:22 ` Daniel Vetter 2018-03-06 7:29 ` Oleksandr Andrushchenko 2018-03-06 7:29 ` Oleksandr Andrushchenko 2018-03-06 7:29 ` Oleksandr Andrushchenko 2018-03-05 12:59 ` Oleksandr Andrushchenko 2018-03-05 9:23 ` Daniel Vetter 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 8/9] drm/xen-front: Implement GEM operations Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-23 15:26 ` Boris Ostrovsky 2018-02-23 15:26 ` Boris Ostrovsky 2018-02-23 15:35 ` Oleksandr Andrushchenko 2018-02-23 15:35 ` Oleksandr Andrushchenko 2018-02-26 23:47 ` Boris Ostrovsky 2018-02-27 6:52 ` Oleksandr Andrushchenko 2018-02-27 6:52 ` Oleksandr Andrushchenko 2018-02-27 6:52 ` Oleksandr Andrushchenko 2018-02-28 19:46 ` Boris Ostrovsky 2018-02-28 19:46 ` Boris Ostrovsky 2018-02-28 19:52 ` Oleksandr Andrushchenko 2018-02-28 19:52 ` Oleksandr Andrushchenko 2018-02-28 19:52 ` Oleksandr Andrushchenko 2018-02-26 23:47 ` Boris Ostrovsky 2018-03-05 9:32 ` Daniel Vetter 2018-03-05 9:32 ` Daniel Vetter 2018-03-05 9:32 ` Daniel Vetter 2018-03-05 13:46 ` Oleksandr Andrushchenko 2018-03-05 13:46 ` Oleksandr Andrushchenko 2018-03-05 13:46 ` Oleksandr Andrushchenko 2018-03-06 7:26 ` Daniel Vetter 2018-03-06 7:43 ` Oleksandr Andrushchenko 2018-03-06 7:43 ` Oleksandr Andrushchenko 2018-03-06 7:26 ` Daniel Vetter 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-21 8:03 ` [PATCH 9/9] drm/xen-front: Implement communication with backend Oleksandr Andrushchenko 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-03-05 9:25 ` Daniel Vetter 2018-03-05 9:25 ` Daniel Vetter 2018-03-05 9:25 ` Daniel Vetter 2018-03-05 9:30 ` Oleksandr Andrushchenko 2018-03-05 9:30 ` Oleksandr Andrushchenko 2018-03-06 9:26 ` Daniel Vetter 2018-03-06 9:26 ` Daniel Vetter 2018-03-06 9:45 ` Oleksandr Andrushchenko 2018-03-06 9:45 ` Oleksandr Andrushchenko 2018-03-06 9:26 ` Daniel Vetter 2018-02-21 8:03 ` Oleksandr Andrushchenko 2018-02-26 8:21 ` [PATCH 0/9] drm/xen-front: Add support for Xen PV display frontend Oleksandr Andrushchenko 2018-02-26 8:21 ` Oleksandr Andrushchenko 2018-02-27 12:40 ` Oleksandr Andrushchenko 2018-02-27 12:40 ` Oleksandr Andrushchenko 2018-02-27 12:40 ` Oleksandr Andrushchenko 2018-02-28 14:08 ` [Xen-devel] " Julien Grall 2018-03-01 1:42 ` Stefano Stabellini 2018-03-01 1:42 ` [Xen-devel] " Stefano Stabellini 2018-03-01 1:42 ` Stefano Stabellini 2018-02-28 14:08 ` Julien Grall 2018-03-01 8:26 ` Gerd Hoffmann 2018-03-01 8:26 ` Gerd Hoffmann 2018-03-01 8:26 ` Gerd Hoffmann 2018-03-01 8:49 ` Oleksandr Andrushchenko 2018-03-01 8:49 ` Oleksandr Andrushchenko 2018-03-01 8:49 ` Oleksandr Andrushchenko 2018-02-26 8:21 ` Oleksandr Andrushchenko 2018-03-01 1:14 ` Stefano Stabellini 2018-03-01 1:14 ` Stefano Stabellini 2018-03-01 1:14 ` Stefano Stabellini
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