[PATCH] soc: qcom: icc-bwmon: fix incorrect error code passed to dev_err_probe()

[PATCH] soc: qcom: icc-bwmon: fix incorrect error code passed to dev_err_probe()

[Krzysztof Kozlowski]

Pass to dev_err_probe() PTR_ERR from actual dev_pm_opp_find_bw_floor()
call which failed, instead of previous ret which at this point is 0.
Failure of dev_pm_opp_find_bw_floor() would result in prematurely ending
the probe with success.

Fixes smatch warnings:

  drivers/soc/qcom/icc-bwmon.c:776 bwmon_probe() warn: passing zero to 'dev_err_probe'
  drivers/soc/qcom/icc-bwmon.c:781 bwmon_probe() warn: passing zero to 'dev_err_probe'

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/202305131657.76XeHDjF-lkp@intel.com/
Cc: <stable@vger.kernel.org>
Fixes: b9c2ae6cac40 ("soc: qcom: icc-bwmon: Add bandwidth monitoring driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Code was tested previously with smatch. Just this test in smatch is new.
---
 drivers/soc/qcom/icc-bwmon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c
index fd58c5b69897..f65bfeca7ed6 100644
--- a/drivers/soc/qcom/icc-bwmon.c
+++ b/drivers/soc/qcom/icc-bwmon.c
@@ -773,12 +773,12 @@ static int bwmon_probe(struct platform_device *pdev)
 	bwmon->max_bw_kbps = UINT_MAX;
 	opp = dev_pm_opp_find_bw_floor(dev, &bwmon->max_bw_kbps, 0);
 	if (IS_ERR(opp))
-		return dev_err_probe(dev, ret, "failed to find max peak bandwidth\n");
+		return dev_err_probe(dev, PTR_ERR(opp), "failed to find max peak bandwidth\n");
 
 	bwmon->min_bw_kbps = 0;
 	opp = dev_pm_opp_find_bw_ceil(dev, &bwmon->min_bw_kbps, 0);
 	if (IS_ERR(opp))
-		return dev_err_probe(dev, ret, "failed to find min peak bandwidth\n");
+		return dev_err_probe(dev, PTR_ERR(opp), "failed to find min peak bandwidth\n");
 
 	bwmon->dev = dev;
 
-- 
2.34.1

Re: [PATCH] soc: qcom: icc-bwmon: fix incorrect error code passed to dev_err_probe()

[Bjorn Andersson]

On Sat, 13 May 2023 13:17:47 +0200, Krzysztof Kozlowski wrote:
> Pass to dev_err_probe() PTR_ERR from actual dev_pm_opp_find_bw_floor()
> call which failed, instead of previous ret which at this point is 0.
> Failure of dev_pm_opp_find_bw_floor() would result in prematurely ending
> the probe with success.
> 
> Fixes smatch warnings:
> 
> [...]

Applied, thanks!

[1/1] soc: qcom: icc-bwmon: fix incorrect error code passed to dev_err_probe()
      commit: 3530167c6fe8001de6c026a3058eaca4c8a5329f

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>