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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[SCSI] advansys: Update resource management
Make sure the resources are reserved and released by all the callers of advansys_board_found(). This eliminates the check_region-style race. It also allows us to use the pci_request_regions() API. Signed-off-by: Matthew Wilcox <matthew@wil.cx> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthew Wilcox
James Bottomley
parent
c304ec9473
commit
71f36115d2
@ -17681,14 +17681,12 @@ advansys_board_found(int iop, struct device *dev, int bus_type)
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boardp->id, pci_memory_address, iolen);
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goto err_shost;
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}
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ASC_DBG1(1,
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"advansys_board_found: ioremap_addr: 0x%lx\n",
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ASC_DBG1(1, "advansys_board_found: ioremap_addr: 0x%lx\n",
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(ulong)boardp->ioremap_addr);
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adv_dvc_varp->iop_base = (AdvPortAddr)
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(boardp->ioremap_addr +
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(pci_memory_address - (pci_memory_address & PAGE_MASK)));
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ASC_DBG1(1,
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"advansys_board_found: iop_base: 0x%lx\n",
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ASC_DBG1(1, "advansys_board_found: iop_base: 0x%lx\n",
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adv_dvc_varp->iop_base);
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#endif /* CONFIG_PCI */
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@ -18169,25 +18167,6 @@ advansys_board_found(int iop, struct device *dev, int bus_type)
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* Register Board Resources - I/O Port, DMA, IRQ
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*/
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/*
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* Register I/O port range.
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*
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* For Wide boards the I/O ports are not used to access
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* the board, but request the region anyway.
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*
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* 'shost->n_io_port' is not referenced, because it may be truncated.
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*/
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ASC_DBG2(2,
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"advansys_board_found: request_region port 0x%lx, len 0x%x\n",
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(ulong)shost->io_port, boardp->asc_n_io_port);
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if (request_region(shost->io_port, boardp->asc_n_io_port,
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"advansys") == NULL) {
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ASC_PRINT3
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("advansys_board_found: board %d: request_region() failed, port 0x%lx, len 0x%x\n",
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boardp->id, (ulong)shost->io_port, boardp->asc_n_io_port);
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goto err_free_proc;
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}
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/* Register DMA Channel for Narrow boards. */
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shost->dma_channel = NO_ISA_DMA; /* Default to no ISA DMA. */
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#ifdef CONFIG_ISA
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@ -18200,7 +18179,7 @@ advansys_board_found(int iop, struct device *dev, int bus_type)
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ASC_PRINT3
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("advansys_board_found: board %d: request_dma() %d failed %d\n",
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boardp->id, shost->dma_channel, ret);
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goto err_free_region;
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goto err_free_proc;
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}
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AscEnableIsaDma(shost->dma_channel);
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}
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@ -18266,8 +18245,6 @@ advansys_board_found(int iop, struct device *dev, int bus_type)
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err_free_dma:
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if (shost->dma_channel != NO_ISA_DMA)
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free_dma(shost->dma_channel);
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err_free_region:
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release_region(shost->io_port, boardp->asc_n_io_port);
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err_free_proc:
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kfree(boardp->prtbuf);
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err_unmap:
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@ -18295,7 +18272,6 @@ static int advansys_release(struct Scsi_Host *shost)
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ASC_DBG(1, "advansys_release: free_dma()\n");
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free_dma(shost->dma_channel);
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}
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release_region(shost->io_port, boardp->asc_n_io_port);
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if (ASC_WIDE_BOARD(boardp)) {
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iounmap(boardp->ioremap_addr);
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advansys_wide_free_mem(boardp);
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@ -18317,19 +18293,17 @@ static int __devinit advansys_isa_probe(struct device *dev, unsigned int id)
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struct Scsi_Host *shost;
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if (!request_region(iop_base, ASC_IOADR_GAP, "advansys")) {
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ASC_DBG1(1, "advansys_isa_match: check_region() failed "
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"I/O port 0x%x\n", iop_base);
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ASC_DBG1(1, "advansys_isa_match: I/O port 0x%x busy\n",
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iop_base);
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return -ENODEV;
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}
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ASC_DBG1(1, "advansys_isa_match: probing I/O port 0x%x\n", iop_base);
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release_region(iop_base, ASC_IOADR_GAP);
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if (!AscFindSignature(iop_base))
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goto nodev;
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if (!(AscGetChipVersion(iop_base, ASC_IS_ISA) & ASC_CHIP_VER_ISA_BIT))
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goto nodev;
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shost = advansys_board_found(iop_base, dev, ASC_IS_ISA);
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if (!shost)
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goto nodev;
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@ -18337,12 +18311,15 @@ static int __devinit advansys_isa_probe(struct device *dev, unsigned int id)
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return 0;
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nodev:
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release_region(iop_base, ASC_IOADR_GAP);
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return -ENODEV;
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}
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static int __devexit advansys_isa_remove(struct device *dev, unsigned int id)
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{
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int ioport = _asc_def_iop_base[id];
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advansys_release(dev_get_drvdata(dev));
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release_region(ioport, ASC_IOADR_GAP);
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return 0;
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}
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@ -18361,12 +18338,11 @@ static int __devinit advansys_vlb_probe(struct device *dev, unsigned int id)
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struct Scsi_Host *shost;
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if (!request_region(iop_base, ASC_IOADR_GAP, "advansys")) {
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ASC_DBG1(1, "advansys_vlb_match: check_region() failed "
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"I/O port 0x%x\n", iop_base);
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ASC_DBG1(1, "advansys_vlb_match: I/O port 0x%x busy\n",
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iop_base);
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return -ENODEV;
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}
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ASC_DBG1(1, "advansys_vlb_match: probing I/O port 0x%x\n", iop_base);
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release_region(iop_base, ASC_IOADR_GAP);
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if (!AscFindSignature(iop_base))
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goto nodev;
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/*
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@ -18378,7 +18354,6 @@ static int __devinit advansys_vlb_probe(struct device *dev, unsigned int id)
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goto nodev;
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shost = advansys_board_found(iop_base, dev, ASC_IS_VL);
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if (!shost)
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goto nodev;
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@ -18386,6 +18361,7 @@ static int __devinit advansys_vlb_probe(struct device *dev, unsigned int id)
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return 0;
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nodev:
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release_region(iop_base, ASC_IOADR_GAP);
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return -ENODEV;
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}
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@ -18429,8 +18405,16 @@ static int __devinit advansys_eisa_probe(struct device *dev)
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err = -ENODEV;
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for (i = 0; i < 2; i++, ioport += 0x20) {
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if (!AscFindSignature(ioport))
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if (!request_region(ioport, ASC_IOADR_GAP, "advansys")) {
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printk(KERN_WARNING "Region %x-%x busy\n", ioport,
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ioport + ASC_IOADR_GAP - 1);
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continue;
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}
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if (!AscFindSignature(ioport)) {
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release_region(ioport, ASC_IOADR_GAP);
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continue;
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}
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/*
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* I don't know why we need to do this for EISA chips, but
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* not for any others. It looks to be equivalent to
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@ -18440,8 +18424,11 @@ static int __devinit advansys_eisa_probe(struct device *dev)
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*/
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inw(ioport + 4);
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data->host[i] = advansys_board_found(ioport, dev, ASC_IS_EISA);
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if (data->host[i])
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if (data->host[i]) {
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err = 0;
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} else {
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release_region(ioport, ASC_IOADR_GAP);
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}
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}
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if (err) {
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@ -18460,10 +18447,13 @@ static __devexit int advansys_eisa_remove(struct device *dev)
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struct eisa_scsi_data *data = dev_get_drvdata(dev);
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for (i = 0; i < 2; i++) {
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int ioport;
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struct Scsi_Host *shost = data->host[i];
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if (!shost)
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continue;
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ioport = shost->io_port;
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advansys_release(shost);
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release_region(ioport, ASC_IOADR_GAP);
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}
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kfree(data);
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@ -18507,6 +18497,9 @@ advansys_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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err = pci_enable_device(pdev);
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if (err)
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goto fail;
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err = pci_request_regions(pdev, "advansys");
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if (err)
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goto disable_device;
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if (pci_resource_len(pdev, 0) == 0)
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goto nodev;
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@ -18522,6 +18515,8 @@ advansys_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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nodev:
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err = -ENODEV;
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pci_release_regions(pdev);
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disable_device:
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pci_disable_device(pdev);
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fail:
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return err;
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@ -18530,6 +18525,7 @@ advansys_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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static void __devexit advansys_pci_remove(struct pci_dev *pdev)
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{
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advansys_release(pci_get_drvdata(pdev));
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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}
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