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[SCSI] sym53c8xx: fix bogus free_irq() on error path 

If sym_attach() gets an error at or before request_irq(), then
sym_free_resources() will call free_irq() for an unregistered
interrupt handler.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Tony Battersby 2009-01-08 12:54:45 -05:00 committed by James Bottomley
parent 07b9d81e84
commit b409063a9b
1 changed files with 7 additions and 4 deletions
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11
drivers/scsi/sym53c8xx_2/sym_glue.c
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@ -1238,12 +1238,13 @@ static int sym53c8xx_proc_info(struct Scsi_Host *shost, char *buffer,
/*
* Free controller resources.
*/
static void sym_free_resources(struct sym_hcb *np, struct pci_dev *pdev)
static void sym_free_resources(struct sym_hcb *np, struct pci_dev *pdev,
int do_free_irq)
{
/*
* Free O/S specific resources.
*/
if (pdev->irq)
if (do_free_irq)
free_irq(pdev->irq, np->s.host);
if (np->s.ioaddr)
pci_iounmap(pdev, np->s.ioaddr);
@ -1275,6 +1276,7 @@ static struct Scsi_Host * __devinit sym_attach(struct scsi_host_template *tpnt,
struct pci_dev *pdev = dev->pdev;
unsigned long flags;
struct sym_fw *fw;
int do_free_irq = 0;
printk(KERN_INFO "sym%d: <%s> rev 0x%x at pci %s irq %u\n",
unit, dev->chip.name, pdev->revision, pci_name(pdev),
@ -1364,6 +1366,7 @@ static struct Scsi_Host * __devinit sym_attach(struct scsi_host_template *tpnt,
sym_name(np), pdev->irq);
goto attach_failed;
}
do_free_irq = 1;
/*
* After SCSI devices have been opened, we cannot
@ -1420,7 +1423,7 @@ static struct Scsi_Host * __devinit sym_attach(struct scsi_host_template *tpnt,
return NULL;
printf_info("sym%d: giving up ...\n", unit);
if (np)
sym_free_resources(np, pdev);
sym_free_resources(np, pdev, do_free_irq);
scsi_host_put(shost);
return NULL;
@ -1659,7 +1662,7 @@ static int sym_detach(struct Scsi_Host *shost, struct pci_dev *pdev)
udelay(10);
OUTB(np, nc_istat, 0);
sym_free_resources(np, pdev);
sym_free_resources(np, pdev, 1);
scsi_host_put(shost);
return 1;