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Message-ID: <Pine.LNX.4.64.1108082036451.12465@ask.diku.dk>
Date: Mon, 8 Aug 2011 20:37:01 +0200 (CEST)
From: Julia Lawall <julia@...u.dk>
To: Dan Carpenter <error27@...il.com>
Cc: "James E.J. Bottomley" <JBottomley@...allels.com>,
kernel-janitors@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] drivers/scsi/atp870u.c: add missing kfree
On Mon, 8 Aug 2011, Dan Carpenter wrote:
> This one is going to need to be redone. There are some parenthesis
> missing so the new code will always fail.
>
> > -1 is probably not the best return value either.
>
> Nope. It's not. You could avoid it most of the time by passing the
> error code from the lower levels, as I show below.
OK, I will look into it. Thanks.
julia
> > drivers/scsi/atp870u.c | 113 +++++++++++++++++++++++++++++--------------------
> > 1 file changed, 69 insertions(+), 44 deletions(-)
> >
> > diff --git a/drivers/scsi/atp870u.c b/drivers/scsi/atp870u.c
> > index 7e6eca4..271211c 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 = pci_enable_device();
>
> > + ret = -EIO;
> > + goto out;
> > + }
> >
> > if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
> ret = pci_set_dma_mask();
>
>
> > 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;
> >
> > @@ -2686,11 +2694,13 @@ flash_ok_880:
> > memcpy(p, atpdev, sizeof(*atpdev));
> > if (atp870u_init_tables(shpnt) < 0) {
>
> ret = atp870u_init_tables();
>
>
> > printk(KERN_ERR "Unable to allocate tables for Acard controller\n");
> > + ret = -1;
> > goto unregister;
> > }
> >
> > if (request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, "atp880i", shpnt)) {
>
> ret = request_irq();
>
>
> > printk(KERN_ERR "Unable to allocate IRQ%d for Acard controller.\n", pdev->irq);
> > + ret = -1;
> > goto free_tables;
> > }
> >
> > @@ -2745,8 +2755,10 @@ 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 +2766,17 @@ flash_ok_880:
> > atpdev->pdev = pdev;
> > pci_set_drvdata(pdev, p);
> > memcpy(p, atpdev, sizeof(struct atp_unit));
> > - if (atp870u_init_tables(shpnt) < 0)
> > + if (atp870u_init_tables(shpnt) < 0) {
>
> ret = atp870u_init_tables();
>
> > + ret = -1;
> > goto unregister;
> > + }
> >
> > #ifdef ED_DBGP
> > printk("request_irq() shpnt %p hostdata %p\n", shpnt, p);
> > #endif
> > if (request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, "atp870u", shpnt)) {
>
> ret = request_irq();
>
> > - printk(KERN_ERR "Unable to allocate IRQ for Acard controller.\n");
> > + printk(KERN_ERR "Unable to allocate IRQ for Acard controller.\n");
> > + ret = -1;
> > goto free_tables;
> > }
> >
> > @@ -2772,13 +2787,11 @@ 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 +2943,10 @@ 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;
> >
> > @@ -2940,10 +2955,12 @@ flash_ok_885:
> > pci_set_drvdata(pdev, p);
> > memcpy(p, atpdev, sizeof(*atpdev));
> > if (atp870u_init_tables(shpnt) < 0)
>
> ret = atp870u_init_tables()
>
> > + ret = -1;
> > goto unregister;
>
> parenthesis needed here.
>
> >
> > if (request_irq(pdev->irq, atp870u_intr_handle, IRQF_SHARED, "atp870i", shpnt)) {
>
> ret = request_irq();
>
> > printk(KERN_ERR "Unable to allocate IRQ%d for Acard controller.\n", pdev->irq);
> > + ret = -1;
> > goto free_tables;
> > }
> >
> > @@ -2991,26 +3008,38 @@ 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 = -1;
>
> If request_region() fails then the correct return is actually
> -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 = -1;
>
> ret = -EBUSY;
>
> > + goto request_io_fail;
> > + }
> > + } else {
> > + /* Register the IO ports that we use */
> > + if (!request_region(base_io, 0x40, "atp870u")) {
> > + ret = -1;
>
> ret = -EBUSY;
>
> > + goto request_io_fail;
> > + }
> > + }
> > + count++;
> > + if (scsi_add_host(shpnt, &pdev->dev)) {
> ret = scsi_add_host();
>
>
> > + ret = -1;
> > + goto scsi_add_fail;
> > + }
>
> regards,
> dan carpenter
> --
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