Hi !

this is also the wrong version of the patch - the proper version is below. This has been posted to lkml https://lkml.org/lkml/2018/7/18/191 "[PATCH V3] drm: handle error values properly" but there was no review yet The version you have here though is for sure broken. So maybe this should be simply dropped until the above, presumably correct fix, is confirmed.

thx! hofrat

----- Forwarded message from gregkh@linuxfoundation.org -----

Date: Tue, 28 Aug 2018 16:09:59 +0200 From: gregkh@linuxfoundation.org To: 1531571532-22733-1-git-send-email-hofrat@osadl.org, alexander.levin@microsoft.com, gregkh@linuxfoundation.org, hofrat@osadl.org, seanpaul@chromium.org Cc: stable-commits@vger.kernel.org Subject: Patch "drm: re-enable error handling" has been added to the 3.18-stable tree

This is a note to let you know that I've just added the patch titled

drm: re-enable error handling

to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-re-enable-error-handling.patch and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Tue Aug 28 16:08:28 CEST 2018

From: Nicholas Mc Guire hofrat@osadl.org Date: Sat, 14 Jul 2018 14:32:12 +0200 Subject: drm: re-enable error handling

From: Nicholas Mc Guire hofrat@osadl.org

[ Upstream commit d530b5f1ca0bb66958a2b714bebe40a1248b9c15 ]

drm_legacy_ctxbitmap_next() returns idr_alloc() which can return -ENOMEM, -EINVAL or -ENOSPC none of which are -1 . but the call sites of drm_legacy_ctxbitmap_next() seem to be assuming that the error case would be -1 (original return of drm_ctxbitmap_next() prior to 2.6.23 was actually -1). Thus reenable error handling by checking for < 0.

Signed-off-by: Nicholas Mc Guire hofrat@osadl.org Fixes: 62968144e673 ("drm: convert drm context code to use Linux idr") Signed-off-by: Sean Paul seanpaul@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/1531571532-22733-1-git-send-em... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_context.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_context.c +++ b/drivers/gpu/drm/drm_context.c @@ -341,7 +341,7 @@ int drm_legacy_addctx(struct drm_device ctx->handle = drm_legacy_ctxbitmap_next(dev); } DRM_DEBUG("%d\n", ctx->handle); - if (ctx->handle == -1) { + if (ctx->handle < 0) { DRM_DEBUG("Not enough free contexts.\n"); /* Should this return -EBUSY instead? */ return -ENOMEM;

Patches currently in stable-queue which might be from hofrat@osadl.org are

queue-3.18/drm-re-enable-error-handling.patch queue-3.18/can-mpc5xxx_can-check-of_iomap-return-before-use.patch

----- End forwarded message -----