https://bugzilla.kernel.org/show_bug.cgi?id=78181
Bug ID: 78181
Summary: pci_disable_device() shouldn't be called when the call
to pci_enable_device() fails.
Product: Drivers
Version: 2.5
Kernel Version: 2.6.39
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Infiniband/RDMA
Assignee: [email protected]
Reporter: [email protected]
Regression: No
In function twa_probe() at drivers/scsi/3w-9xxx.c:2030, the call to
pci_disable_device() at line 2173 is after the failure of pci_enable_device().
it may be wrong.
The related code snippets in function twa_probe() are as followings.
twa_probe @ drivers/scsi/3w-9xxx.c:2030
2030 static int __devinit twa_probe(struct pci_dev *pdev, const struct
pci_device_id *dev_id)
2031 {
2032 struct Scsi_Host *host = NULL;
2033 TW_Device_Extension *tw_dev;
2034 unsigned long mem_addr, mem_len;
2035 int retval = -ENODEV;
2036
2037 retval = pci_enable_device(pdev);
2038 if (retval) {
2039 TW_PRINTK(host, TW_DRIVER, 0x34, "Failed to enable pci
device");
2040 goto out_disable_device;
2041 }
2042
...
2169 out_free_device_extension:
2170 twa_free_device_extension(tw_dev);
2171 scsi_host_put(host);
2172 out_disable_device:
2173 pci_disable_device(pdev);
2174
2175 return retval;
2176 }
Generally, the call to pci_disable_device() shall be after the successful call
to pci_enable_device(), like the following code snippets in function
c2_probe().
c2_probe @ drivers/infiniband/hw/amso1100/c2.c:924
924 static int __devinit c2_probe(struct pci_dev *pcidev,
925 const struct pci_device_id *ent)
926 {
927 int ret = 0, i;
928 unsigned long reg0_start, reg0_flags, reg0_len;
...
940 ret = pci_enable_device(pcidev);
941 if (ret) {
942 printk(KERN_ERR PFX "%s: Unable to enable PCI device\n",
943 pci_name(pcidev));
944 goto bail0;
945 }
...
1187
1188 bail1:
1189 pci_disable_device(pcidev);
1190
1191 bail0:
1192 return ret;
1193 }
the above suspect bug exists in function twl_probe() at drivers/scsi/3w-sas.c
and function qla2x00_probe_one() at drivers/scsi/qla2xxx/qla_os.c.
Thak you!
RUC_Soft_Sec, supported by China.X.Orion
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