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drm/i915: fix blank screen booting crashes

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5.15-rc1 crashes with blank screen when booting up on two ThinkPads
using i915.  Bisections converge convincingly, but arrive at different
and suprising "culprits", none of them the actual culprit.

netconsole (with init_netconsole() hacked to call i915_init() when
logging has started, instead of by module_init()) tells the story:

kernel BUG at drivers/gpu/drm/i915/i915_sw_fence.c:245!
with RSI: ffffffff814d408b pointing to sw_fence_dummy_notify().
I've been building with CONFIG_CC_OPTIMIZE_FOR_SIZE=y, and that
function needs to be 4-byte aligned.

Fixes: 62eaf0ae21 ("drm/i915/guc: Support request cancellation")
Signed-off-by: Hugh Dickins <hughd@google.com>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2021-10-02 03:17:29 -07:00 committed by Linus Torvalds
parent 53d5fc89d6
commit cdc1e6e225
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/gt/intel_context.c
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@ -362,8 +362,9 @@ static int __intel_context_active(struct i915_active *active)
return 0;
}
static int sw_fence_dummy_notify(struct i915_sw_fence *sf,
enum i915_sw_fence_notify state)
static int __i915_sw_fence_call
sw_fence_dummy_notify(struct i915_sw_fence *sf,
enum i915_sw_fence_notify state)
{
return NOTIFY_DONE;
}