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| author | Niklas Cassel | 2017-12-14 14:01:46 +0100 |
|---|---|---|
| committer | Lorenzo Pieralisi | 2017-12-19 12:05:44 +0100 |
| commit | 35ad61921f495ee14915d185de79478c1737b4da (patch) | |
| tree | db9fa7fdeb5e4db2613ec3132cb31afc2fba0795 /drivers/pci/endpoint/pci-ep-cfs.c | |
| parent | PCI: endpoint: Populate func_no before calling pci_epc_add_epf() (diff) | |
| download | kernel-qcow2-linux-35ad61921f495ee14915d185de79478c1737b4da.tar.gz kernel-qcow2-linux-35ad61921f495ee14915d185de79478c1737b4da.tar.xz kernel-qcow2-linux-35ad61921f495ee14915d185de79478c1737b4da.zip | |
PCI: endpoint: Fix find_first_zero_bit() usage
find_first_zero_bit()'s parameter 'size' is defined in bits,
not in bytes.
Calling find_first_zero_bit() with the wrong size unit
will lead to insidious bugs.
Fix this by calling find_first_zero_bit() with size BITS_PER_LONG,
rather than sizeof() and add missing find_first_zero_bit() return
handling.
Fixes: d74679911610 ("PCI: endpoint: Introduce configfs entry for configuring EP functions")
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/pci/endpoint/pci-ep-cfs.c')
| -rw-r--r-- | drivers/pci/endpoint/pci-ep-cfs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c index e8f65eb51c1a..c9a2fb9dd49d 100644 --- a/drivers/pci/endpoint/pci-ep-cfs.c +++ b/drivers/pci/endpoint/pci-ep-cfs.c @@ -103,7 +103,10 @@ static int pci_epc_epf_link(struct config_item *epc_item, struct pci_epf *epf = epf_group->epf; func_no = find_first_zero_bit(&epc_group->function_num_map, - sizeof(epc_group->function_num_map)); + BITS_PER_LONG); + if (func_no >= BITS_PER_LONG) + return -EINVAL; + set_bit(func_no, &epc_group->function_num_map); epf->func_no = func_no; |