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extmod/fsusermount: In mount/mkfs, deregister VFS object on error. 

Should fix issue #1947.
This commit is contained in:
Damien George 2016-04-14 23:36:25 +01:00
parent 7d2c685544
commit bcd719ea3a
1 changed files with 8 additions and 2 deletions
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10
extmod/fsusermount.c
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@ -81,8 +81,7 @@ fs_user_mount_t *fatfs_mount_mkfs(mp_uint_t n_args, const mp_obj_t *pos_args, mp
}
// create new object
fs_user_mount_t *vfs;
MP_STATE_PORT(fs_user_mount)[i] = vfs = m_new_obj(fs_user_mount_t);
fs_user_mount_t *vfs = m_new_obj(fs_user_mount_t);
vfs->str = mnt_str;
vfs->len = mnt_len;
vfs->flags = FSUSER_FREE_OBJ;
@ -108,6 +107,11 @@ fs_user_mount_t *fatfs_mount_mkfs(mp_uint_t n_args, const mp_obj_t *pos_args, mp
vfs->writeblocks[0] = MP_OBJ_NULL;
}
// Register the vfs object so that it can be found by the FatFS driver using
// ff_get_ldnumber. We don't register it any earlier than this point in case there
// is an exception, in which case there would remain a partially mounted device.
MP_STATE_PORT(fs_user_mount)[i] = vfs;
// mount the block device (if mkfs, only pre-mount)
FRESULT res = f_mount(&vfs->fatfs, vfs->str, !mkfs);
// check the result
@ -120,6 +124,7 @@ mkfs:
res = f_mkfs(vfs->str, 1, 0);
if (res != FR_OK) {
mkfs_error:
MP_STATE_PORT(fs_user_mount)[i] = NULL;
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't mkfs"));
}
if (mkfs) {
@ -132,6 +137,7 @@ mkfs_error:
return NULL;
}
} else {
MP_STATE_PORT(fs_user_mount)[i] = NULL;
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't mount"));
}