From 3794afbeb177ed0932d166d30bb2af9d9859dff9 Mon Sep 17 00:00:00 2001 From: Konsta Holtta Date: Tue, 13 Nov 2018 15:36:19 +0200 Subject: gpu: nvgpu: add safe channel id lookup Add gk20a_channel_from_id() to retrieve a channel, given a raw channel ID, with a reference taken (or NULL if the channel was dead). This makes it harder to mistakenly use a channel that's dead and thus uncovers bugs sooner. Convert code to use the new lookup when applicable; work remains to convert complex uses where a ref should have been taken but hasn't. The channel ID is also validated against FIFO_INVAL_CHANNEL_ID; NULL is returned for such IDs. This is often useful and does not hurt when unnecessary. However, this does not prevent the case where a channel would be closed and reopened again when someone would hold a stale channel number. In all such conditions the caller should hold a reference already. The only conditions where a channel can be safely looked up by an id and used without taking a ref are when initializing or deinitializing the list of channels. Jira NVGPU-1460 Change-Id: I0a30968d17c1e0784d315a676bbe69c03a73481c Signed-off-by: Konsta Holtta Reviewed-on: https://git-master.nvidia.com/r/1955400 Signed-off-by: Debarshi Dutta (cherry picked from commit 7df3d587502c2de997dfbe8ea8ddc114d0a0481e in dev-kernel) Reviewed-on: https://git-master.nvidia.com/r/2008515 Reviewed-by: mobile promotions Tested-by: mobile promotions --- drivers/gpu/nvgpu/vgpu/vgpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/nvgpu/vgpu/vgpu.c') diff --git a/drivers/gpu/nvgpu/vgpu/vgpu.c b/drivers/gpu/nvgpu/vgpu/vgpu.c index 266b801e..07361afe 100644 --- a/drivers/gpu/nvgpu/vgpu/vgpu.c +++ b/drivers/gpu/nvgpu/vgpu/vgpu.c @@ -119,7 +119,7 @@ static void vgpu_handle_channel_event(struct gk20a *g, static void vgpu_channel_abort_cleanup(struct gk20a *g, u32 chid) { - struct channel_gk20a *ch = gk20a_channel_get(&g->fifo.channel[chid]); + struct channel_gk20a *ch = gk20a_channel_from_id(g, chid); if (ch == NULL) { nvgpu_err(g, "invalid channel id %d", chid); -- cgit v1.2.2