diff options
author | Simon Horman <horms@verge.net.au> | 2008-08-07 04:56:34 (GMT) |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-08-07 16:49:07 (GMT) |
commit | a844158a642ffe8b3b29964a88ee802c2834ed0a (patch) | |
tree | 05ab9fe0a7b31af7f2885fd07ef1bfda50b977ba /drivers/pci/probe.c | |
parent | abad2ec98f2ef357d62026cbc3989dabf33f2435 (diff) | |
download | linux-a844158a642ffe8b3b29964a88ee802c2834ed0a.tar.xz |
PCI: check the return value of device_create_bin_file() in pci_create_bus()
Check the return value of device_create_bin_file in pci_create_bus and
unwind if necessary. Don't propagate error to caller, as failure to create
these files shouldn't prevent PCI from being initialised. Instead, just
log a warning.
Cc: Sven Wegener <sven.wegener@stealer.net>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r-- | drivers/pci/probe.c | 54 |
1 files changed, 38 insertions, 16 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 7098dfb..a04498d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -52,27 +52,49 @@ EXPORT_SYMBOL(no_pci_devices); * Some platforms allow access to legacy I/O port and ISA memory space on * a per-bus basis. This routine creates the files and ties them into * their associated read, write and mmap files from pci-sysfs.c + * + * On error unwind, but don't propogate the error to the caller + * as it is ok to set up the PCI bus without these files. */ static void pci_create_legacy_files(struct pci_bus *b) { + int error; + b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, GFP_ATOMIC); - if (b->legacy_io) { - b->legacy_io->attr.name = "legacy_io"; - b->legacy_io->size = 0xffff; - b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; - b->legacy_io->read = pci_read_legacy_io; - b->legacy_io->write = pci_write_legacy_io; - device_create_bin_file(&b->dev, b->legacy_io); - - /* Allocated above after the legacy_io struct */ - b->legacy_mem = b->legacy_io + 1; - b->legacy_mem->attr.name = "legacy_mem"; - b->legacy_mem->size = 1024*1024; - b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; - b->legacy_mem->mmap = pci_mmap_legacy_mem; - device_create_bin_file(&b->dev, b->legacy_mem); - } + if (!b->legacy_io) + goto kzalloc_err; + + b->legacy_io->attr.name = "legacy_io"; + b->legacy_io->size = 0xffff; + b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; + b->legacy_io->read = pci_read_legacy_io; + b->legacy_io->write = pci_write_legacy_io; + error = device_create_bin_file(&b->dev, b->legacy_io); + if (error) + goto legacy_io_err; + + /* Allocated above after the legacy_io struct */ + b->legacy_mem = b->legacy_io + 1; + b->legacy_mem->attr.name = "legacy_mem"; + b->legacy_mem->size = 1024*1024; + b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; + b->legacy_mem->mmap = pci_mmap_legacy_mem; + error = device_create_bin_file(&b->dev, b->legacy_mem); + if (error) + goto legacy_mem_err; + + return; + +legacy_mem_err: + device_remove_bin_file(&b->dev, b->legacy_io); +legacy_io_err: + kfree(b->legacy_io); + b->legacy_io = NULL; +kzalloc_err: + printk(KERN_WARNING "pci: warning: could not create legacy I/O port " + "and ISA memory resources to sysfs\n"); + return; } void pci_remove_legacy_files(struct pci_bus *b) |