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fpga: altera-cvp: fix probing for multiple FPGAs on the bus

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[ Upstream commit 30522a951f ]

Currently registering CvP managers works only for first probed CvP
device, for all other devices it is refused due to duplicated chkcfg
sysfs entry:

fpga_manager fpga3: Altera CvP FPGA Manager @0000:0c:00.0 registered
sysfs: cannot create duplicate filename '/bus/pci/drivers/altera-cvp/chkcfg'
CPU: 0 PID: 3808 Comm: bash Tainted: G           O      4.19.0-custom+ #5
Call Trace:
  dump_stack+0x46/0x5b
  sysfs_warn_dup+0x53/0x60
  sysfs_add_file_mode_ns+0x16d/0x180
  sysfs_create_file_ns+0x51/0x60
  altera_cvp_probe+0x16f/0x2a0 [altera_cvp]
  local_pci_probe+0x3f/0xa0
  ? pci_match_device+0xb1/0xf0
  pci_device_probe+0x116/0x170
  really_probe+0x21b/0x2c0
  driver_probe_device+0x4b/0xe0
  bind_store+0xcb/0x130
  kernfs_fop_write+0xfd/0x180
  __vfs_write+0x21/0x150
  ? selinux_file_permission+0xdc/0x130
  vfs_write+0xa8/0x1a0
  ? find_vma+0xd/0x60
  ksys_write+0x3d/0x90
  do_syscall_64+0x44/0xf0
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  ...
 altera-cvp 0000:0c:00.0: Can't create sysfs chkcfg file
 fpga_manager fpga3: fpga_mgr_unregister Altera CvP FPGA Manager @0000:0c:00.0

Move chkcfg creation to module init as suggested by Alan.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anatolij Gustschin
2018-11-26 11:35:27 -06:00
committed by Greg Kroah-Hartman
parent 7cae65dbc7
commit e4c04fd441
1 changed files with 24 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/fpga/altera-cvp.c
View File

@@ -468,14 +468,6 @@ static int altera_cvp_probe(struct pci_dev *pdev,
goto err_unmap;
}
ret = driver_create_file(&altera_cvp_driver.driver,
&driver_attr_chkcfg);
if (ret) {
dev_err(&pdev->dev, "Can't create sysfs chkcfg file\n");
fpga_mgr_unregister(mgr);
goto err_unmap;
}
return 0;
err_unmap:
@@ -493,7 +485,6 @@ static void altera_cvp_remove(struct pci_dev *pdev)
struct altera_cvp_conf *conf = mgr->priv;
u16 cmd;
driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg);
fpga_mgr_unregister(mgr);
pci_iounmap(pdev, conf->map);
pci_release_region(pdev, CVP_BAR);
@@ -502,7 +493,30 @@ static void altera_cvp_remove(struct pci_dev *pdev)
pci_write_config_word(pdev, PCI_COMMAND, cmd);
}
module_pci_driver(altera_cvp_driver);
static int __init altera_cvp_init(void)
{
int ret;
ret = pci_register_driver(&altera_cvp_driver);
if (ret)
return ret;
ret = driver_create_file(&altera_cvp_driver.driver,
&driver_attr_chkcfg);
if (ret)
pr_warn("Can't create sysfs chkcfg file\n");
return 0;
}
static void __exit altera_cvp_exit(void)
{
driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg);
pci_unregister_driver(&altera_cvp_driver);
}
module_init(altera_cvp_init);
module_exit(altera_cvp_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");