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ntb: initialize max_mw for Atom before using it

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Commit ab760a0 (ntb: Adding split BAR support for Haswell platforms)
changed ntb_device's mw from a fixed-size array into a pointer that is
allocated based on limits.max_mw; however, on Atom platforms, max_mw
is not initialized until ntb_device_setup(), which happens after the
allocation.

Fill out max_mw in ntb_atom_detect() to match ntb_xeon_detect(); this
happens before the use of max_mw in the ndev->mw allocation.

Fixes a null pointer dereference on Atom platforms with ntb hardware.

v2: fix typo (mw_max should be max_mw)

Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Daniel Verkamp 2015-05-13 15:50:04 -07:00 committed by Jon Mason
parent 2f4eb6a80e
commit ebaad1322d
1 changed files with 1 additions and 0 deletions
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drivers/ntb/ntb_hw.c
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@ -1660,6 +1660,7 @@ static int ntb_atom_detect(struct ntb_device *ndev)
u32 ppd;
ndev->hw_type = BWD_HW;
ndev->limits.max_mw = BWD_MAX_MW;
rc = pci_read_config_dword(ndev->pdev, NTB_PPD_OFFSET, &ppd);
if (rc)