From: Julia Lawall <julia@xxxxxxx> Atpdev is only used as a local buffer, so it should be freed in both the normal exist case and in all error handling code. The initial comment is also incorrect - non-zero is returned on failure. -1 is no longer used as an error return value, and is replaced by a value that is somehow related to the cause of the error. -EBUSY is used in the case of the failure of request_region. This patch also includes a lot of cleanups to satisfy checkpatch. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @exists@ local idexpression x; statement S,S1; expression E; identifier fl; expression *ptr != NULL; @@ x = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...kfree(x)...+> } when any when != true x == NULL x->fl ...> ( if (x == NULL) S1 | if (...) { ... when != x when forall ( return \(0\|<+...x...+>\|ptr\); | * return ...; ) } ) // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- As compared to the previous version, -1 is no longer used as a return value and some missing braces have been added. drivers/scsi/atp870u.c | 126 +++++++++++++++++++++++++++++-------------------- 1 file changed, 76 insertions(+), 50 deletions(-) diff --git a/drivers/scsi/atp870u.c b/drivers/scsi/atp870u.c index 7e6eca4..99b1da1 100644 --- a/drivers/scsi/atp870u.c +++ b/drivers/scsi/atp870u.c @@ -2552,7 +2552,7 @@ static int atp870u_init_tables(struct Scsi_Host *host) return 0; } -/* return non-zero on detection */ +/* return zero on detection */ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { unsigned char k, m, c; @@ -2563,19 +2563,23 @@ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent) struct atp_unit *atpdev, *p; unsigned char setupdata[2][16]; int count = 0; + int ret = 0; atpdev = kzalloc(sizeof(*atpdev), GFP_KERNEL); if (!atpdev) return -ENOMEM; - if (pci_enable_device(pdev)) - goto err_eio; + if (pci_enable_device(pdev)) { + ret = -EIO; + goto out; + } if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) { printk(KERN_INFO "atp870u: use 32bit DMA mask.\n"); } else { printk(KERN_ERR "atp870u: DMA mask required but not available.\n"); - goto err_eio; + ret = -EIO; + goto out; } /* @@ -2584,8 +2588,10 @@ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent) */ if (ent->device == PCI_DEVICE_ID_ARTOP_AEC7610) { error = pci_read_config_byte(pdev, PCI_CLASS_REVISION, &atpdev->chip_ver); - if (atpdev->chip_ver < 2) - goto err_eio; + if (atpdev->chip_ver < 2) { + ret = -EIO; + goto out; + } } switch (ent->device) { @@ -2675,8 +2681,10 @@ flash_ok_880: outb(atpdev->global_map[0], base_io + 0x35); shpnt = scsi_host_alloc(&atp870u_template, sizeof(struct atp_unit)); - if (!shpnt) - goto err_nomem; + if (!shpnt) { + ret = -ENOMEM; + goto out; + } p = (struct atp_unit *)&shpnt->hostdata; @@ -2684,12 +2692,15 @@ flash_ok_880: atpdev->pdev = pdev; pci_set_drvdata(pdev, p); memcpy(p, atpdev, sizeof(*atpdev)); - if (atp870u_init_tables(shpnt) < 0) { + ret = atp870u_init_tables(shpnt); + if (ret < 0) { printk(KERN_ERR "Unable to allocate tables for Acard controller\n"); goto unregister; } - if (request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, "atp880i", shpnt)) { + ret = request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, + "atp880i", shpnt); + if (ret) { printk(KERN_ERR "Unable to allocate IRQ%d for Acard controller.\n", pdev->irq); goto free_tables; } @@ -2745,8 +2756,10 @@ flash_ok_880: atpdev->pciport[1] = base_io + 0x50; shpnt = scsi_host_alloc(&atp870u_template, sizeof(struct atp_unit)); - if (!shpnt) - goto err_nomem; + if (!shpnt) { + ret = -ENOMEM; + goto out; + } p = (struct atp_unit *)&shpnt->hostdata; @@ -2754,14 +2767,17 @@ flash_ok_880: atpdev->pdev = pdev; pci_set_drvdata(pdev, p); memcpy(p, atpdev, sizeof(struct atp_unit)); - if (atp870u_init_tables(shpnt) < 0) + ret = atp870u_init_tables(shpnt); + if (ret < 0) goto unregister; #ifdef ED_DBGP - printk("request_irq() shpnt %p hostdata %p\n", shpnt, p); + printk("request_irq() shpnt %p hostdata %p\n", shpnt, p); #endif - if (request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, "atp870u", shpnt)) { - printk(KERN_ERR "Unable to allocate IRQ for Acard controller.\n"); + ret = request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, + "atp870u", shpnt); + if (ret) { + printk(KERN_ERR "Unable to allocate IRQ for Acard controller.\n"); goto free_tables; } @@ -2772,13 +2788,11 @@ flash_ok_880: n=0x1f80; next_fblk_885: - if (n >= 0x2000) { - goto flash_ok_885; - } + if (n >= 0x2000) + goto flash_ok_885; outw(n,base_io + 0x3c); - if (inl(base_io + 0x38) == 0xffffffff) { - goto flash_ok_885; - } + if (inl(base_io + 0x38) == 0xffffffff) + goto flash_ok_885; for (m=0; m < 2; m++) { p->global_map[m]= 0; for (k=0; k < 4; k++) { @@ -2930,8 +2944,10 @@ flash_ok_885: } shpnt = scsi_host_alloc(&atp870u_template, sizeof(struct atp_unit)); - if (!shpnt) - goto err_nomem; + if (!shpnt) { + ret = -ENOMEM; + goto out; + } p = (struct atp_unit *)&shpnt->hostdata; @@ -2939,10 +2955,13 @@ flash_ok_885: atpdev->pdev = pdev; pci_set_drvdata(pdev, p); memcpy(p, atpdev, sizeof(*atpdev)); - if (atp870u_init_tables(shpnt) < 0) + ret = atp870u_init_tables(shpnt); + if (ret < 0) goto unregister; - if (request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, "atp870i", shpnt)) { + ret = request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, + "atp870i", shpnt); + if (ret) { printk(KERN_ERR "Unable to allocate IRQ%d for Acard controller.\n", pdev->irq); goto free_tables; } @@ -2991,26 +3010,37 @@ flash_ok_885: shpnt->io_port = base_io; shpnt->n_io_port = 0x40; /* Number of bytes of I/O space used */ shpnt->irq = pdev->irq; - } - spin_unlock_irqrestore(shpnt->host_lock, flags); - if(ent->device==ATP885_DEVID) { - if(!request_region(base_io, 0xff, "atp870u")) /* Register the IO ports that we use */ - goto request_io_fail; - } else if((ent->device==ATP880_DEVID1)||(ent->device==ATP880_DEVID2)) { - if(!request_region(base_io, 0x60, "atp870u")) /* Register the IO ports that we use */ - goto request_io_fail; - } else { - if(!request_region(base_io, 0x40, "atp870u")) /* Register the IO ports that we use */ - goto request_io_fail; - } - count++; - if (scsi_add_host(shpnt, &pdev->dev)) - goto scsi_add_fail; - scsi_scan_host(shpnt); + } + spin_unlock_irqrestore(shpnt->host_lock, flags); + if (ent->device == ATP885_DEVID) { + /* Register the IO ports that we use */ + if (!request_region(base_io, 0xff, "atp870u")) { + ret = -EBUSY; + goto request_io_fail; + } + } else if ((ent->device == ATP880_DEVID1) || + (ent->device == ATP880_DEVID2)) { + /* Register the IO ports that we use */ + if (!request_region(base_io, 0x60, "atp870u")) { + ret = -EBUSY; + goto request_io_fail; + } + } else { + /* Register the IO ports that we use */ + if (!request_region(base_io, 0x40, "atp870u")) { + ret = -EBUSY; + goto request_io_fail; + } + } + count++; + ret = scsi_add_host(shpnt, &pdev->dev); + if (ret) + goto scsi_add_fail; + scsi_scan_host(shpnt); #ifdef ED_DBGP - printk("atp870u_prob : exit\n"); + printk(KERN_DEBUG "atp870u_prob : exit\n"); #endif - return 0; + goto out; scsi_add_fail: printk("atp870u_prob:scsi_add_fail\n"); @@ -3030,13 +3060,9 @@ free_tables: unregister: printk("atp870u_prob:unregister\n"); scsi_host_put(shpnt); - return -1; -err_eio: - kfree(atpdev); - return -EIO; -err_nomem: +out: kfree(atpdev); - return -ENOMEM; + return ret; } /* The abort command does not leave the device in a clean state where -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
