+Cc Ferry (the topic is non-SOF version of sound driver for Intel Merrifield) On Fri, Dec 03, 2021 at 07:46:04AM -0600, Pierre-Louis Bossart wrote: > On 12/3/21 4:13 AM, Dan Carpenter wrote: > > Hello Vinod Koul, > > > > The patch f533a035e4da: "ASoC: Intel: mrfld - create separate module > > for pci part" from Nov 4, 2014, leads to the following Smatch static > > checker warning: > > > > sound/soc/intel/atom/sst/sst_pci.c:102 sst_platform_get_resources() > > warn: resource freed on success: 'ctx->pci' > > > > sound/soc/intel/atom/sst/sst_pci.c > > 25 static int sst_platform_get_resources(struct intel_sst_drv *ctx) > > 26 { > > 27 int ddr_base, ret = 0; > > 28 struct pci_dev *pci = ctx->pci; > > 29 > > 30 ret = pci_request_regions(pci, SST_DRV_NAME); > > 31 if (ret) > > 32 return ret; > > 33 > > 34 /* map registers */ > > 35 /* DDR base */ > > 36 if (ctx->dev_id == SST_MRFLD_PCI_ID) { > > 37 ctx->ddr_base = pci_resource_start(pci, 0); > > 38 /* check that the relocated IMR base matches with FW Binary */ > > 39 ddr_base = relocate_imr_addr_mrfld(ctx->ddr_base); > > 40 if (!ctx->pdata->lib_info) { > > 41 dev_err(ctx->dev, "lib_info pointer NULL\n"); > > 42 ret = -EINVAL; > > 43 goto do_release_regions; > > 44 } > > 45 if (ddr_base != ctx->pdata->lib_info->mod_base) { > > 46 dev_err(ctx->dev, > > 47 "FW LSP DDR BASE does not match with IFWI\n"); > > 48 ret = -EINVAL; > > 49 goto do_release_regions; > > 50 } > > 51 ctx->ddr_end = pci_resource_end(pci, 0); > > 52 > > 53 ctx->ddr = pcim_iomap(pci, 0, > > 54 pci_resource_len(pci, 0)); > > 55 if (!ctx->ddr) { > > 56 ret = -EINVAL; > > 57 goto do_release_regions; > > 58 } > > 59 dev_dbg(ctx->dev, "sst: DDR Ptr %p\n", ctx->ddr); > > 60 } else { > > 61 ctx->ddr = NULL; > > 62 } > > 63 /* SHIM */ > > 64 ctx->shim_phy_add = pci_resource_start(pci, 1); > > 65 ctx->shim = pcim_iomap(pci, 1, pci_resource_len(pci, 1)); > > 66 if (!ctx->shim) { > > 67 ret = -EINVAL; > > 68 goto do_release_regions; > > 69 } > > 70 dev_dbg(ctx->dev, "SST Shim Ptr %p\n", ctx->shim); > > 71 > > 72 /* Shared SRAM */ > > 73 ctx->mailbox_add = pci_resource_start(pci, 2); > > 74 ctx->mailbox = pcim_iomap(pci, 2, pci_resource_len(pci, 2)); > > 75 if (!ctx->mailbox) { > > 76 ret = -EINVAL; > > 77 goto do_release_regions; > > 78 } > > 79 dev_dbg(ctx->dev, "SRAM Ptr %p\n", ctx->mailbox); > > 80 > > 81 /* IRAM */ > > 82 ctx->iram_end = pci_resource_end(pci, 3); > > 83 ctx->iram_base = pci_resource_start(pci, 3); > > 84 ctx->iram = pcim_iomap(pci, 3, pci_resource_len(pci, 3)); > > 85 if (!ctx->iram) { > > 86 ret = -EINVAL; > > 87 goto do_release_regions; > > 88 } > > 89 dev_dbg(ctx->dev, "IRAM Ptr %p\n", ctx->iram); > > 90 > > 91 /* DRAM */ > > 92 ctx->dram_end = pci_resource_end(pci, 4); > > 93 ctx->dram_base = pci_resource_start(pci, 4); > > 94 ctx->dram = pcim_iomap(pci, 4, pci_resource_len(pci, 4)); > > 95 if (!ctx->dram) { > > 96 ret = -EINVAL; > > 97 goto do_release_regions; > > 98 } > > 99 dev_dbg(ctx->dev, "DRAM Ptr %p\n", ctx->dram); > > 100 do_release_regions: > > 101 pci_release_regions(pci); > > --> 102 return ret; > > 103 } > > > > Surely there should be a "return 0;" before the do_release_regions: > > label? How does this code work? > > Thanks for reporting this Dan. Yes this doesn't look good at all. > > This PCI part is only used on Merrifield/Tangier, and I am not sure if > anyone ever managed to make audio work with the upstream version of this > driver. It's my understanding that this platform is no longer maintained > by Intel, and the Edison Yocto code uses the SOF driver. > > The Kconfig updated in 2018 hints at those limitations: > > config SND_SST_ATOM_HIFI2_PLATFORM_PCI > tristate "PCI HiFi2 (Merrifield) Platforms" > depends on X86 && PCI > select SND_SST_ATOM_HIFI2_PLATFORM > help > If you have a Intel Merrifield/Edison platform, then > enable this option by saying Y or m. Distros will typically not > enable this option: while Merrifield/Edison can run a mainline > kernel with limited functionality it will require a firmware file > which is not in the standard firmware tree > > I would guess that indeed a return 0; is missing, but maybe it's time to > remove this PCI code completely. I can't think of any user of the PCI > parts of this driver. > > Andy, Hans, Mark, Takashi, what do you think? -- With Best Regards, Andy Shevchenko