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Y. Srinivasan" , Laxman Dewangan , Len Brown , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-tegra@vger.kernel.org, Russell King , Lorenzo Pieralisi , Lyude Paul , Marek Szyprowski , nouveau@lists.freedesktop.org, Palmer Dabbelt , Paul Walmsley , "Rafael J. Wysocki" , Rob Herring , Robin Murphy , Sudeep Holla , Suravee Suthikulpanit , Sven Peter , Thomas Bogendoerfer , Vineet Gupta , Vinod Koul , Wei Liu , Will Deacon , Lu Baolu , Christoph Hellwig , Jerry Snitselaar , Hector Martin , Moritz Fischer , patches@lists.linux.dev, "Rafael J. Wysocki" , Rob Herring , Thierry Reding X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231128_220909_112005_A3BF8A83 X-CRM114-Status: GOOD ( 22.14 ) X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed"; DelSp="yes" Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org On Tue, Nov 28, 2023 at 08:48:03PM -0400, Jason Gunthorpe wrote: > Nothing needs this pointer. Return a normal error code with the usual > IOMMU semantic that ENODEV means 'there is no IOMMU driver'. > Acked-by: Rafael J. Wysocki > Reviewed-by: Jerry Snitselaar > Tested-by: Hector Martin > Signed-off-by: Jason Gunthorpe > --- > drivers/acpi/scan.c | 29 +++++++++++++++++------------ > 1 file changed, 17 insertions(+), 12 deletions(-) > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 444a0b3c72f2d8..340ba720c72129 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1562,8 +1562,7 @@ static inline const struct iommu_ops > *acpi_iommu_fwspec_ops(struct device *dev) > return fwspec ? fwspec->ops : NULL; > } > -static const struct iommu_ops *acpi_iommu_configure_id(struct device > *dev, > - const u32 *id_in) > +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) > { > int err; > const struct iommu_ops *ops; > @@ -1577,7 +1576,7 @@ static const struct iommu_ops > *acpi_iommu_configure_id(struct device *dev, > ops = acpi_iommu_fwspec_ops(dev); > if (ops) { > mutex_unlock(&iommu_probe_device_lock); > - return ops; > + return 0; > } > err = iort_iommu_configure_id(dev, id_in); > @@ -1594,12 +1593,14 @@ static const struct iommu_ops > *acpi_iommu_configure_id(struct device *dev, > /* Ignore all other errors apart from EPROBE_DEFER */ > if (err == -EPROBE_DEFER) { > - return ERR_PTR(err); > + return err; > } else if (err) { > dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); > - return NULL; > + return -ENODEV; > } > - return acpi_iommu_fwspec_ops(dev); > + if (!acpi_iommu_fwspec_ops(dev)) > + return -ENODEV; > + return 0; > } > #else /* !CONFIG_IOMMU_API */ > @@ -1611,10 +1612,9 @@ int acpi_iommu_fwspec_init(struct device *dev, u32 > id, > return -ENODEV; > } > -static const struct iommu_ops *acpi_iommu_configure_id(struct device > *dev, > - const u32 *id_in) > +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) > { > - return NULL; > + return -ENODEV; > } > #endif /* !CONFIG_IOMMU_API */ > @@ -1628,7 +1628,7 @@ static const struct iommu_ops > *acpi_iommu_configure_id(struct device *dev, > int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, > const u32 *input_id) > { > - const struct iommu_ops *iommu; > + int ret; > if (attr == DEV_DMA_NOT_SUPPORTED) { > set_dma_ops(dev, &dma_dummy_ops); > @@ -1637,10 +1637,15 @@ int acpi_dma_configure_id(struct device *dev, > enum dev_dma_attr attr, > acpi_arch_dma_setup(dev); > - iommu = acpi_iommu_configure_id(dev, input_id); > - if (PTR_ERR(iommu) == -EPROBE_DEFER) > + ret = acpi_iommu_configure_id(dev, input_id); > + if (ret == -EPROBE_DEFER) > return -EPROBE_DEFER; > + /* > + * Historically this routine doesn't fail driver probing due to errors > + * in acpi_iommu_configure_id() > + */ > + > arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT); > return 0; > -- > 2.42.0 Reviewed-by: Moritz Fischer Cheers, Moritz _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc