Message ID | 1573449697-5448-2-git-send-email-tyreld@linux.ibm.com (mailing list archive) |
---|---|
State | Mainlined, archived |
Commit | 57409d4fb12c185b2c0689e0496878c8f6bb5b58 |
Headers | show |
Series | Fixes and Enablement of ibm,drc-info property | expand |
On Mon, 2019-11-11 at 05:21:28 UTC, Tyrel Datwyler wrote: > The ibm,drc-info property is an array property that contains drc-info > entries such that each entry is made up of 2 string encoded elements > followed by 5 int encoded elements. The of_read_drc_info_cell() > helper contains comments that correctly name the expected elements > and their encoding. However, the usage of of_prop_next_string() and > of_prop_next_u32() introduced a subtle skippage of the first u32. > This is a result of of_prop_next_string() returning a pointer to the > next property value which is not a string, but actually a (__be32 *). > As, a result the following call to of_prop_next_u32() passes over the > current int encoded value and actually stores the next one wrongly. > > Simply endian swap the current value in place after reading the first > two string values. The remaining int encoded values can then be read > correctly using of_prop_next_u32(). > > Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com> Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/57409d4fb12c185b2c0689e0496878c8f6bb5b58 cheers
diff --git a/arch/powerpc/platforms/pseries/of_helpers.c b/arch/powerpc/platforms/pseries/of_helpers.c index 6df192f..66dfd82 100644 --- a/arch/powerpc/platforms/pseries/of_helpers.c +++ b/arch/powerpc/platforms/pseries/of_helpers.c @@ -45,14 +45,14 @@ struct device_node *pseries_of_derive_parent(const char *path) int of_read_drc_info_cell(struct property **prop, const __be32 **curval, struct of_drc_info *data) { - const char *p; + const char *p = (char *)(*curval); const __be32 *p2; if (!data) return -EINVAL; /* Get drc-type:encode-string */ - p = data->drc_type = (char*) (*curval); + data->drc_type = (char *)p; p = of_prop_next_string(*prop, p); if (!p) return -EINVAL; @@ -65,9 +65,7 @@ int of_read_drc_info_cell(struct property **prop, const __be32 **curval, /* Get drc-index-start:encode-int */ p2 = (const __be32 *)p; - p2 = of_prop_next_u32(*prop, p2, &data->drc_index_start); - if (!p2) - return -EINVAL; + data->drc_index_start = be32_to_cpu(*p2); /* Get drc-name-suffix-start:encode-int */ p2 = of_prop_next_u32(*prop, p2, &data->drc_name_suffix_start);
The ibm,drc-info property is an array property that contains drc-info entries such that each entry is made up of 2 string encoded elements followed by 5 int encoded elements. The of_read_drc_info_cell() helper contains comments that correctly name the expected elements and their encoding. However, the usage of of_prop_next_string() and of_prop_next_u32() introduced a subtle skippage of the first u32. This is a result of of_prop_next_string() returning a pointer to the next property value which is not a string, but actually a (__be32 *). As, a result the following call to of_prop_next_u32() passes over the current int encoded value and actually stores the next one wrongly. Simply endian swap the current value in place after reading the first two string values. The remaining int encoded values can then be read correctly using of_prop_next_u32(). Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com> --- arch/powerpc/platforms/pseries/of_helpers.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)