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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Subject: Re: [PATCH net v1 1/1] net: usb: asix: ax88772: Increase phy_name size Message-ID: References: <20250318161702.2982063-1-andriy.shevchenko@linux.intel.com> <481268aa-c8e9-4475-bd5c-8d0f82a6652a@lunn.ch> Precedence: bulk X-Mailing-List: netdev@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: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo On Tue, Mar 18, 2025 at 06:09:12PM +0100, Andrew Lunn wrote: > On Tue, Mar 18, 2025 at 06:54:48PM +0200, Andy Shevchenko wrote: > > On Tue, Mar 18, 2025 at 05:49:05PM +0100, Andrew Lunn wrote: ... > > > > - char phy_name[20]; > > > > + char phy_name[MII_BUS_ID_SIZE + 5]; > > > > > > Could you explain the + 5? > > > > > > https://elixir.bootlin.com/linux/v6.13.7/source/drivers/net/ethernet/davicom/dm9051.c#L1156 > > > https://elixir.bootlin.com/linux/v6.13.7/source/drivers/net/ethernet/freescale/fec_main.c#L2454 > > > https://elixir.bootlin.com/linux/v6.13.7/source/drivers/net/ethernet/xilinx/ll_temac.h#L348 > > > > > > The consensus seems to be + 3. And shouldn't it be 4 actually? %s [MII_BUS_ID_SIZE] + ':' + '%02x' + nul > > u16, gcc can't proove the range, it assumes 65536 is the maximum. > > > > include/linux/phy.h:312:20: note: directive argument in the range [0, 65535] > > How about after > > ret = asix_read_phy_addr(dev, priv->use_embdphy); > if (ret < 0) > goto free; > > add > > if (ret > 31) { > netdev_err(dev->net, "Invalid PHY ID %d\n", ret); > return -ENODEV; > } > > and see if GCC can follow that? No, with + 3 it doesn't work, need + 4. Another possibility to change the _FMT to have %02hhx instead of %02x. Tell me which one should I take? -- With Best Regards, Andy Shevchenko