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Mon, 31 Aug 2026 04:01:15 -0700 (PDT) Date: Mon, 31 Aug 2026 12:01:12 +0100 From: Salah Triki To: Andy Shevchenko Cc: Nuno =?iso-8859-1?Q?S=E1?= , Michael Hennerich , Jonathan Cameron , David Lechner , Andy Shevchenko , linux@analog.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] iio: adc: ad4030: fix invalid oversampling_ratio validation Message-ID: References: <20260824051026.11049-1-salah.triki@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hi Andy, Sorry for the confusion - my previous v3 email crossed paths with yours. Regarding is_power_of_2(avg_val): following feedback from David and Jonathan, we agreed to keep only the check for non-positive values (avg_val <= 0) to avoid the invalid ilog2(0) call. Checking for non-powers of two was dropped to preserve standard IIO attribute rounding behavior. I will sent v4 addressing all your formatting and style requirements. Thanks for your patience and thorough review. Best regards, Salah Triki On Mon, Aug 24, 2026 at 05:54:31PM +0300, Andy Shevchenko wrote: > On Mon, Aug 24, 2026 at 06:10:26AM +0100, Salah Triki wrote: > > ad4030_set_avg_frame_len() computes avg_log2 = ilog2(avg_val) before > > validating avg_val. The existing check (avg_val < 0) allows avg_val == 0 > > Try to write the sentences straight to the point using plain English, > Avoid using C language as substitute of plain English. > > > to pass through, resulting in ilog2(0) being called with undefined/garbage > > behavior. > > > > Reject non-positive values (avg_val <= 0) before computing log2. > > > > This issue was identified with assistance from Claude AI and manually > > verified against the code. > > > Changes since v1: > > - Added note stating the issue was identified with assistance from > > Claude AI and verified manually. > > Assisted-by? > > ... > > > static int ad4030_set_avg_frame_len(struct iio_dev *dev, int avg_val) > > { > > struct ad4030_state *st = iio_priv(dev); > > - unsigned int avg_log2 = ilog2(avg_val); > > + unsigned int avg_log2; > > Have you read my comments to the previous version? > > > unsigned int last_avg_idx = ARRAY_SIZE(ad4030_average_modes) - 1; > > int freq_hz; > > int ret; > > > > - if (avg_val < 0 || avg_val > ad4030_average_modes[last_avg_idx]) > > + if (avg_val <= 0 || avg_val > ad4030_average_modes[last_avg_idx]) > > return -EINVAL; > > Ditto. > > > -- > With Best Regards, > Andy Shevchenko > >