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fpga: dfl: Avoid reads to AFU CSRs during enumeration 

CSR address space for Accelerator Functional Units (AFU) is not available
during the early Device Feature List (DFL) enumeration. Early access
to this space results in invalid data and port errors. This change adds
a condition to prevent an early read from the AFU CSR space.

Fixes: 1604986c3e ("fpga: dfl: expose feature revision from struct dfl_device")
Cc: stable@vger.kernel.org
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
This commit is contained in:
Russ Weight 2021-09-16 14:07:33 -07:00 committed by Moritz Fischer
parent a1e4470823
commit e9a9970bf5
1 changed files with 8 additions and 6 deletions
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14
drivers/fpga/dfl.c
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@ -1019,16 +1019,18 @@ create_feature_instance(struct build_feature_devs_info *binfo,
{
unsigned int irq_base, nr_irqs;
struct dfl_feature_info *finfo;
u8 revision = 0;
int ret;
u8 revision;
u64 v;
v = readq(binfo->ioaddr + ofst);
revision = FIELD_GET(DFH_REVISION, v);
if (fid != FEATURE_ID_AFU) {
v = readq(binfo->ioaddr + ofst);
revision = FIELD_GET(DFH_REVISION, v);
/* read feature size and id if inputs are invalid */
size = size ? size : feature_size(v);
fid = fid ? fid : feature_id(v);
/* read feature size and id if inputs are invalid */
size = size ? size : feature_size(v);
fid = fid ? fid : feature_id(v);
}
if (binfo->len - ofst < size)
return -EINVAL;