diff options
Diffstat (limited to 'ubi-utils/libubi.c')
| -rw-r--r-- | ubi-utils/libubi.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/ubi-utils/libubi.c b/ubi-utils/libubi.c index 8e1d3ee..a7463e8 100644 --- a/ubi-utils/libubi.c +++ b/ubi-utils/libubi.c @@ -769,6 +769,35 @@ int ubi_attach(libubi_t desc, const char *node, struct ubi_attach_request *req) r.ubi_num = req->dev_num; r.mtd_num = req->mtd_num; r.vid_hdr_offset = req->vid_hdr_offset; + + if (req->max_beb_per1024) { + /* + * We first have to check if the running kernel supports the + * 'max_beb_per1024' parameter. To do this, we invoke the + * "attach" ioctl 2 times: first with incorrect value %-1 of + * 'max_beb_per1024'. + * + * If the ioctl succeeds, it means that the kernel doesn't + * support the feature and just ignored our 'max_beb_per1024' + * value. + * + * If the ioctl returns -EINVAL, we assume this is because + * 'max_beb_per1024' was set to -1, and we invoke the ioctl for + * the second time with the 'max_beb_per1024' value. + */ + r.max_beb_per1024 = -1; + ret = do_attach(node, &r); + if (ret == 0) { + req->dev_num = r.ubi_num; + /* + * The call succeeded. It means that the kernel ignored + * 'max_beb_per1024' parameter. + */ + return 1; + } else if (errno != EINVAL) + return ret; + } + r.max_beb_per1024 = req->max_beb_per1024; ret = do_attach(node, &r); |