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fpga: region: check for child regions before allocing image info

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During a device tree overlay pre-apply notification, the check
for child FPGA regions can happen slightly earlier.  This saves
us from allocating the FPGA image info that just gets thrown
away.

This is a baby step in refactoring the FPGA region code to
separate out common FPGA region code from FPGA region
Device Tree overlay support.

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Tull 2017-11-15 14:20:17 -06:00 committed by Greg Kroah-Hartman
parent 1df2dd7f58
commit 1743df83ae
1 changed files with 9 additions and 5 deletions
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14
drivers/fpga/fpga-region.c
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@ -355,15 +355,19 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
const char *firmware_name;
int ret;
info = fpga_image_info_alloc(dev);
if (!info)
return -ENOMEM;
/* Reject overlay if child FPGA Regions have firmware-name property */
/*
* Reject overlay if child FPGA Regions added in the overlay have
* firmware-name property (would mean that an FPGA region that has
* not been added to the live tree yet is doing FPGA programming).
*/
ret = child_regions_with_firmware(nd->overlay);
if (ret)
return ret;
info = fpga_image_info_alloc(dev);
if (!info)
return -ENOMEM;
/* Read FPGA region properties from the overlay */
if (of_property_read_bool(nd->overlay, "partial-fpga-config"))
info->flags |= FPGA_MGR_PARTIAL_RECONFIG;