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drm: re-enable error handling 

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: 62968144e6 ("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-email-hofrat@osadl.org
This commit is contained in:
Nicholas Mc Guire 2018-07-14 14:32:12 +02:00 committed by Sean Paul
parent 5f34175691
commit d530b5f1ca
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_context.c
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@ -372,7 +372,7 @@ int drm_legacy_addctx(struct drm_device *dev, void *data,
ctx->handle = drm_legacy_ctxbitmap_next(dev); ctx->handle = drm_legacy_ctxbitmap_next(dev);
} }
DRM_DEBUG("%d\n", ctx->handle); DRM_DEBUG("%d\n", ctx->handle);
if (ctx->handle == -1) { if (ctx->handle < 0) {
DRM_DEBUG("Not enough free contexts.\n"); DRM_DEBUG("Not enough free contexts.\n");
/* Should this return -EBUSY instead? */ /* Should this return -EBUSY instead? */
return -ENOMEM; return -ENOMEM;