[0921/1094] drm/i915: Translate ENOSPC from shmem_get_page() to ENOMEM

Commit Message

Dheeraj Jamwal Oct. 21, 2014, 10:58 a.m. UTC

From: Chris Wilson <[e-mail]>

shmemfs first checks if there is enough memory to allocate the page
and reports ENOSPC should there be insufficient, along with
the usual ENOMEM for a genuine allocation failure.

We use ENOSPC in our driver to mean that we have run out of aperture
space and so want to translate the error from shmemfs back to
our usual understanding of ENOMEM. None of the the other GEM users
appear to distinguish between ENOMEM and ENOSPC in their error handling,
hence it is easiest to do the fixup in i915.ko

Cc: Hugh Dickins <[e-mail]>
Signed-off-by: Chris Wilson <[e-mail]>
Reviewed-by: Robert Beckett <[e-mail]>
Reviewed-by: Rafael Barbalho <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
(cherry picked from commit 0820baf39bd95dcbbc3600bd7f50b137f41ebb8a)

Signed-off-by: Dheeraj Jamwal <[e-mail]>
---
 drivers/gpu/drm/i915/i915_gem.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index af9642a..2ece259 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2090,7 +2090,19 @@  err_pages:
 		page_cache_release(sg_page_iter_page(&sg_iter));
 	sg_free_table(st);
 	kfree(st);
-	return PTR_ERR(page);
+
+	/* shmemfs first checks if there is enough memory to allocate the page
+	 * and reports ENOSPC should there be insufficient, along with the usual
+	 * ENOMEM for a genuine allocation failure.
+	 *
+	 * We use ENOSPC in our driver to mean that we have run out of aperture
+	 * space and so want to translate the error from shmemfs back to our
+	 * usual understanding of ENOMEM.
+	 */
+	if (PTR_ERR(page) == -ENOSPC)
+		return -ENOMEM;
+	else
+		return PTR_ERR(page);
 }
 
 /* Ensure that the associated pages are gathered from the backing storage