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Subject[PATCH v3 15/16] block: sed-opal: don't repeat opal_discovery0 in each steps array
Date
Originally each of the opal functions that call next include
opal_discovery0 in the array of steps. This is superfluous and
can be done always inside next.

Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
block/sed-opal.c | 89 +++++++++++++++++++++++-------------------------
1 file changed, 43 insertions(+), 46 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 21f2789a20cb..3362741dd198 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -221,6 +221,7 @@ static const u8 opalmethod[][OPAL_METHOD_LENGTH] = {
};

static int end_opal_session_error(struct opal_dev *dev);
+static int opal_discovery0_step(struct opal_dev *dev);

struct opal_suspend_data {
struct opal_lock_unlock unlk;
@@ -386,36 +387,42 @@ static void check_geometry(struct opal_dev *dev, const void *data)
dev->lowest_lba = geo->lowest_aligned_lba;
}

+static int execute_step(struct opal_dev *dev,
+ const struct opal_step *step, size_t stepIndex)
+{
+ int error = step->fn(dev, step->data);
+
+ if (error) {
+ pr_debug("Step %zu (%pS) failed with error %d: %s\n",
+ stepIndex, step->fn, error,
+ opal_error_to_human(error));
+ }
+
+ return error;
+}
+
static int next(struct opal_dev *dev, const struct opal_step *steps,
size_t n_steps)
{
- const struct opal_step *step;
size_t state;
- int error = 0;
+ int error;

- for (state = 0; !error && state < n_steps; state++) {
- step = &steps[state];
-
- error = step->fn(dev, step->data);
- if (error) {
- pr_debug("Step %zu (%pS) failed with error %d: %s\n",
- state, step->fn, error,
- opal_error_to_human(error));
-
- /* For each OPAL command we do a discovery0 then we
- * start some sort of session.
- * If we haven't passed state 1 then there was an error
- * on discovery0 or during the attempt to start a
- * session. Therefore we shouldn't attempt to terminate
- * a session, as one has not yet been created.
- */
- if (state > 1) {
- end_opal_session_error(dev);
- return error;
- }
+ /* first do a discovery0 */
+ error = opal_discovery0_step(dev);

- }
- }
+ for (state = 0; !error && state < n_steps; state++)
+ error = execute_step(dev, &steps[state], state);
+
+ /*
+ * For each OPAL command the first step in steps starts some sort of
+ * session. If an error occurred in the initial discovery0 or if an
+ * error occurred in the first step (and thus stopping the loop with
+ * state == 1) then there was an error before or during the attempt to
+ * start a session. Therefore we shouldn't attempt to terminate a
+ * session, as one has not yet been created.
+ */
+ if (error && state > 1)
+ end_opal_session_error(dev);

return error;
}
@@ -513,6 +520,14 @@ static int opal_discovery0(struct opal_dev *dev, void *data)
return opal_discovery0_end(dev);
}

+static int opal_discovery0_step(struct opal_dev *dev)
+{
+ const struct opal_step discovery0_step = {
+ opal_discovery0,
+ };
+ return execute_step(dev, &discovery0_step, 0);
+}
+
static size_t remaining_size(struct opal_dev *cmd)
{
return IO_BUFFER_LENGTH - cmd->pos;
@@ -1938,10 +1953,10 @@ static int end_opal_session(struct opal_dev *dev, void *data)

static int end_opal_session_error(struct opal_dev *dev)
{
- const struct opal_step error_end_session[] = {
- { end_opal_session, }
+ const struct opal_step error_end_session = {
+ end_opal_session,
};
- return next(dev, error_end_session, ARRAY_SIZE(error_end_session));
+ return execute_step(dev, &error_end_session, 0);
}

static inline void setup_opal_dev(struct opal_dev *dev)
@@ -1953,14 +1968,11 @@ static inline void setup_opal_dev(struct opal_dev *dev)

static int check_opal_support(struct opal_dev *dev)
{
- const struct opal_step steps[] = {
- { opal_discovery0, }
- };
int ret;

mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
- ret = next(dev, steps, ARRAY_SIZE(steps));
+ ret = opal_discovery0_step(dev);
dev->supported = !ret;
mutex_unlock(&dev->dev_lock);
return ret;
@@ -2013,7 +2025,6 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev,
struct opal_session_info *opal_session)
{
const struct opal_step erase_steps[] = {
- { opal_discovery0, },
{ start_auth_opal_session, opal_session },
{ get_active_key, &opal_session->opal_key.lr },
{ gen_key, },
@@ -2032,7 +2043,6 @@ static int opal_erase_locking_range(struct opal_dev *dev,
struct opal_session_info *opal_session)
{
const struct opal_step erase_steps[] = {
- { opal_discovery0, },
{ start_auth_opal_session, opal_session },
{ erase_locking_range, opal_session },
{ end_opal_session, }
@@ -2052,7 +2062,6 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
u8 token = opal_mbr->enable_disable == OPAL_MBR_ENABLE
? OPAL_TRUE : OPAL_FALSE;
const struct opal_step mbr_steps[] = {
- { opal_discovery0, },
{ start_admin1LSP_opal_session, &opal_mbr->key },
{ set_mbr_done, &token },
{ end_opal_session, },
@@ -2078,7 +2087,6 @@ static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
u8 token = opal_mbr->enable_disable == OPAL_MBR_ENABLE
? OPAL_TRUE : OPAL_FALSE;
const struct opal_step mbr_steps[] = {
- { opal_discovery0, },
{ start_admin1LSP_opal_session, &opal_mbr->key },
{ set_mbr_done, &token },
{ end_opal_session, }
@@ -2100,7 +2108,6 @@ static int opal_write_shadow_mbr(struct opal_dev *dev,
struct opal_shadow_mbr *info)
{
const struct opal_step mbr_steps[] = {
- { opal_discovery0, },
{ start_admin1LSP_opal_session, &info->key },
{ write_shadow_mbr, info },
{ end_opal_session, }
@@ -2142,7 +2149,6 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
struct opal_lock_unlock *lk_unlk)
{
const struct opal_step steps[] = {
- { opal_discovery0, },
{ start_admin1LSP_opal_session, &lk_unlk->session.opal_key },
{ add_user_to_lr, lk_unlk },
{ end_opal_session, }
@@ -2176,7 +2182,6 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal)
{
const struct opal_step revert_steps[] = {
- { opal_discovery0, },
{ start_SIDASP_opal_session, opal },
{ revert_tper, } /* controller will terminate session */
};
@@ -2201,13 +2206,11 @@ static int __opal_lock_unlock(struct opal_dev *dev,
struct opal_lock_unlock *lk_unlk)
{
const struct opal_step unlock_steps[] = {
- { opal_discovery0, },
{ start_auth_opal_session, &lk_unlk->session },
{ lock_unlock_locking_range, lk_unlk },
{ end_opal_session, }
};
const struct opal_step unlock_sum_steps[] = {
- { opal_discovery0, },
{ start_auth_opal_session, &lk_unlk->session },
{ lock_unlock_locking_range_sum, lk_unlk },
{ end_opal_session, }
@@ -2224,7 +2227,6 @@ static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
{
u8 mbr_done_tf = 1;
const struct opal_step mbrdone_step[] = {
- { opal_discovery0, },
{ start_admin1LSP_opal_session, key },
{ set_mbr_done, &mbr_done_tf },
{ end_opal_session, }
@@ -2251,7 +2253,6 @@ static int opal_lock_unlock(struct opal_dev *dev,
static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
{
const struct opal_step owner_steps[] = {
- { opal_discovery0, },
{ start_anybodyASP_opal_session, },
{ get_msid_cpin_pin, },
{ end_opal_session, },
@@ -2275,7 +2276,6 @@ static int opal_activate_lsp(struct opal_dev *dev,
struct opal_lr_act *opal_lr_act)
{
const struct opal_step active_steps[] = {
- { opal_discovery0, },
{ start_SIDASP_opal_session, &opal_lr_act->key },
{ get_lsp_lifecycle, },
{ activate_lsp, opal_lr_act },
@@ -2297,7 +2297,6 @@ static int opal_setup_locking_range(struct opal_dev *dev,
struct opal_user_lr_setup *opal_lrs)
{
const struct opal_step lr_steps[] = {
- { opal_discovery0, },
{ start_auth_opal_session, &opal_lrs->session },
{ setup_locking_range, opal_lrs },
{ end_opal_session, }
@@ -2314,7 +2313,6 @@ static int opal_setup_locking_range(struct opal_dev *dev,
static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
{
const struct opal_step pw_steps[] = {
- { opal_discovery0, },
{ start_auth_opal_session, &opal_pw->session },
{ set_new_pw, &opal_pw->new_user_pw },
{ end_opal_session, }
@@ -2338,7 +2336,6 @@ static int opal_activate_user(struct opal_dev *dev,
struct opal_session_info *opal_session)
{
const struct opal_step act_steps[] = {
- { opal_discovery0, },
{ start_admin1LSP_opal_session, &opal_session->opal_key },
{ internal_activate_user, opal_session },
{ end_opal_session, }
--
2.20.1
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