gpu: nvgpu: Fix crash on read fail of mc_boot_0_r

This CL handles
- erroneous use of boot_0 function pointer
before being assigned in __nvgpu_check_gpu_state
- And proper handling of error returned from gk20a_readl
in gk20a_mc_boot_0
With these fixes crash is not seen in case mc_boot_0 read
returns 0 in gk20a_mc_boot_0
- And also this handles the recursion caused by mc.boot_0()
calling nvgpu_readl and nvgpu_readl in turn
calling mc.boot_0 in case of read failure

Bug 2010966

Change-Id: Ia087811c67d88948b7fc5fff35e0fabc6ea91989
Signed-off-by: Supriya <ssharatkumar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1616274
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/io.h b/drivers/gpu/nvgpu/include/nvgpu/io.h
index 94ae8f95..b7281b41 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/io.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/io.h
@@ -40,6 +40,7 @@ struct gk20a;
 
 void nvgpu_writel(struct gk20a *g, u32 r, u32 v);
 u32 nvgpu_readl(struct gk20a *g, u32 r);
+u32 __nvgpu_readl(struct gk20a *g, u32 r);
 void nvgpu_writel_check(struct gk20a *g, u32 r, u32 v);
 void nvgpu_bar1_writel(struct gk20a *g, u32 b, u32 v);
 u32 nvgpu_bar1_readl(struct gk20a *g, u32 b);