ASoC: wm8904: Make undocumented registers non-readable

---
I think the intention of wm8904_readable_register is to return false for undocumented registers, but current code returns true for all cases in wm8904_readable_register.
Please review if this patch is correct or not.
Thanks.

 sound/soc/codecs/wm8904.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index b783743..f48b9cb 100644
@@ -312,7 +312,7 @@ static bool wm8904_readable_register(struct device *dev, unsigned int reg)
 	case WM8904_FLL_NCO_TEST_1:
 		return true;
 	default:
-		return true;
+		return false;
 	}
 }
 

2.1.4

Ok so I have been through every register access in the driver (yes that was a bit boring) and it looks like the driver only accesses a register that isn't marked as readable once. But this looks to be a bug. WM8904_EQ_REGS is set to 25, but there are only 24 registers in the EQ. This appears to be a mistake caused by the fact the registers start numbering from 1 rather than 0. I will send a patch to fix this small bug and this patch looks fine to me:

Unfortunately I don't have hardware to test the patch, but I have reviewed it pretty carefully and am happy.

Thanks,
Charles

The patch

ASoC: wm8904: Make undocumented registers non-readable

has been applied to the asoc tree at

git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying to this mail.

Thanks,
Mark

From: Axel Lin <[email protected]>
Date: Wed, 18 Nov 2015 16:24:56 +0800
Subject: [PATCH] ASoC: wm8904: Make undocumented registers non-readable

---
 sound/soc/codecs/wm8904.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 2aa23f1b9e3c..8172e499e6ed 100644
@@ -312,7 +312,7 @@ static bool wm8904_readable_register(struct device *dev, unsigned int reg)
 	case WM8904_FLL_NCO_TEST_1:
 		return true;
 	default:
-		return true;
+		return false;
 	}
 }
 

2.6.2