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Rozycki" Cc: Brian Cain , Marcel Holtmann , Luiz Augusto von Dentz , Patrik Jakobsson , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Dave Airlie , Gerd Hoffmann , Lucas De Marchi , Thomas =?ISO-8859-1?Q?Hellstr=F6m?= , Rodrigo Vivi , Greg Kroah-Hartman , Jiri Slaby , Arnd Bergmann , Heiko Carstens , linux-kernel@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-bluetooth@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux.dev, spice-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-serial@vger.kernel.org, linux-arch@vger.kernel.org, Arnd Bergmann Date: Tue, 08 Oct 2024 10:56:03 +0200 In-Reply-To: <46d81b40dda20ada3b5847353a866172b419c811.camel@linux.ibm.com> References: <20241007-b4-has_ioport-v6-0-03f7240da6e5@linux.ibm.com> <20241007-b4-has_ioport-v6-4-03f7240da6e5@linux.ibm.com> <46d81b40dda20ada3b5847353a866172b419c811.camel@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; prefer-encrypt=mutual; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: qIMioW5q3Mahl1KJ04F9fKhsNix9uZzR X-Proofpoint-ORIG-GUID: GkJJHirZNOqaGxqDAjmSdCfRvIEM_njJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-08_06,2024-10-08_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 bulkscore=0 suspectscore=0 mlxlogscore=987 adultscore=0 clxscore=1015 impostorscore=0 mlxscore=0 phishscore=0 malwarescore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410080053 On Tue, 2024-10-08 at 10:16 +0200, Niklas Schnelle wrote: > On Mon, 2024-10-07 at 22:09 +0100, Maciej W. Rozycki wrote: > > On Mon, 7 Oct 2024, Niklas Schnelle wrote: > >=20 > > > diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/= 8250/8250_pci.c > > > index 6709b6a5f3011db38acc58dc7223158fe4fcf72e..6a638feb44e443a199898= 0dd037748f227ec1bc8 100644 > > > --- a/drivers/tty/serial/8250/8250_pci.c > > > +++ b/drivers/tty/serial/8250/8250_pci.c > > [...] > > > iobase =3D pci_resource_start(dev, 0); > > > outb(0x0, iobase + CH384_XINT_ENABLE_REG); > > > } > > > =20 > > > - > > > static int > > > pci_sunix_setup(struct serial_private *priv, > > > const struct pciserial_board *board, > >=20 > > Gratuitous change here. > >=20 > > > diff --git a/drivers/tty/serial/8250/8250_pcilib.c b/drivers/tty/seri= al/8250/8250_pcilib.c > > > index ea906d721b2c3eac15c9e8d62cc6fa56c3ef6150..fc1882d7515b5814ff124= 0ffdbe1009ab908ad6b 100644 > > > --- a/drivers/tty/serial/8250/8250_pcilib.c > > > +++ b/drivers/tty/serial/8250/8250_pcilib.c > > > @@ -28,6 +28,10 @@ int serial8250_pci_setup_port(struct pci_dev *dev,= struct uart_8250_port *port, > > > port->port.membase =3D pcim_iomap_table(dev)[bar] + offset; > > > port->port.regshift =3D regshift; > > > } else { > > > + if (!IS_ENABLED(CONFIG_HAS_IOPORT)) { > > > + pr_err("Serial port %lx requires I/O port support\n", port->port.= iobase); > > > + return -EINVAL; > > > + } > > > port->port.iotype =3D UPIO_PORT; > > > port->port.iobase =3D pci_resource_start(dev, bar) + offset; > > > port->port.mapbase =3D 0; > >=20 > > Can we please flatten this conditional and get rid of the negation, an= d=20 > > also use `pci_err' for clear identification (`port->port.iobase' may no= t=20 > > even have been set to anything meaningful if this triggers)? I.e.: > >=20 > > /* ... */ > > } else if (IS_ENABLED(CONFIG_HAS_IOPORT)) { > > /* ... */ > > } else { > > pci_err(dev, "serial port requires I/O port support\n"); > > return -EINVAL; > > } > >=20 > > I'd also say "port I/O" (by analogy to "memory-mapped I/O") rather than= =20 > > "I/O port", but I can imagine it might be debatable. >=20 > Agree this looks better, will change it. While changing this I noticed that this isn't aligned with the other print. There we use dev_warn() and -ENXIO vs -EINVAL. How about we move serial_8250_need_ioport() to 8250_pcilib.c and use it here too? Then we also only have a single place for the message. Thanks, Niklas