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Subject[PATCH v3 8/8] staging: ccree: remove BUG macro usage
Date
Replace BUG() macro usage that crash the kernel with alternatives
that signal error and/or try to recover.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
drivers/staging/ccree/ssi_buffer_mgr.c | 18 ++++++------------
drivers/staging/ccree/ssi_cipher.c | 1 -
drivers/staging/ccree/ssi_pm.c | 3 ++-
drivers/staging/ccree/ssi_request_mgr.c | 22 ++++++++++++++++------
4 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/staging/ccree/ssi_buffer_mgr.c b/drivers/staging/ccree/ssi_buffer_mgr.c
index 6393609..67c3296 100644
--- a/drivers/staging/ccree/ssi_buffer_mgr.c
+++ b/drivers/staging/ccree/ssi_buffer_mgr.c
@@ -81,11 +81,6 @@ static unsigned int ssi_buffer_mgr_get_sgl_nents(
unsigned int nents = 0;

while (nbytes != 0) {
- if (sg_is_chain(sg_list)) {
- SSI_LOG_ERR("Unexpected chained entry "
- "in sg (entry =0x%X)\n", nents);
- BUG();
- }
if (sg_list->length != 0) {
nents++;
/* get the number of bytes in the last entry */
@@ -854,7 +849,7 @@ static inline int ssi_buffer_mgr_aead_chain_assoc(
//if have reached the end of the sgl, then this is unexpected
if (!current_sg) {
SSI_LOG_ERR("reached end of sg list. unexpected\n");
- BUG();
+ return -EINVAL;
}
sg_index += current_sg->length;
mapped_nents++;
@@ -1134,10 +1129,9 @@ static inline int ssi_buffer_mgr_aead_chain_data(

offset = size_to_skip;

- if (!sg_data) {
- rc = -EINVAL;
- goto chain_data_exit;
- }
+ if (!sg_data)
+ return -EINVAL;
+
areq_ctx->src_sgl = req->src;
areq_ctx->dst_sgl = req->dst;

@@ -1154,7 +1148,7 @@ static inline int ssi_buffer_mgr_aead_chain_data(
//if have reached the end of the sgl, then this is unexpected
if (!areq_ctx->src_sgl) {
SSI_LOG_ERR("reached end of sg list. unexpected\n");
- BUG();
+ return -EINVAL;
}
sg_index += areq_ctx->src_sgl->length;
src_mapped_nents--;
@@ -1198,7 +1192,7 @@ static inline int ssi_buffer_mgr_aead_chain_data(
//if have reached the end of the sgl, then this is unexpected
if (!areq_ctx->dst_sgl) {
SSI_LOG_ERR("reached end of sg list. unexpected\n");
- BUG();
+ return -EINVAL;
}
sg_index += areq_ctx->dst_sgl->length;
dst_mapped_nents--;
diff --git a/drivers/staging/ccree/ssi_cipher.c b/drivers/staging/ccree/ssi_cipher.c
index ab0349f..a462075 100644
--- a/drivers/staging/ccree/ssi_cipher.c
+++ b/drivers/staging/ccree/ssi_cipher.c
@@ -541,7 +541,6 @@ ssi_blkcipher_create_setup_desc(
break;
default:
SSI_LOG_ERR("Unsupported cipher mode (%d)\n", cipher_mode);
- BUG();
}
}

diff --git a/drivers/staging/ccree/ssi_pm.c b/drivers/staging/ccree/ssi_pm.c
index 31325e6..a50671a 100644
--- a/drivers/staging/ccree/ssi_pm.c
+++ b/drivers/staging/ccree/ssi_pm.c
@@ -109,7 +109,8 @@ int ssi_power_mgr_runtime_put_suspend(struct device *dev)
rc = pm_runtime_put_autosuspend(dev);
} else {
/* Something wrong happens*/
- BUG();
+ SSI_LOG_ERR("request to suspend already suspended queue");
+ rc = -EBUSY;
}
return rc;
}
diff --git a/drivers/staging/ccree/ssi_request_mgr.c b/drivers/staging/ccree/ssi_request_mgr.c
index e5c2f92..97c2359 100644
--- a/drivers/staging/ccree/ssi_request_mgr.c
+++ b/drivers/staging/ccree/ssi_request_mgr.c
@@ -369,11 +369,16 @@ int send_request(
enqueue_seq(cc_base, &req_mgr_h->compl_desc, (is_dout ? 0 : 1));

if (unlikely(req_mgr_h->q_free_slots < total_seq_len)) {
- /*This means that there was a problem with the resume*/
- BUG();
+ /* This situation should never occur. Maybe indicating problem
+ * with resuming power. Set the free slot count to 0 and hope
+ * for the best.
+ */
+ SSI_LOG_ERR("HW free slot count mismatch.");
+ req_mgr_h->q_free_slots = 0;
+ } else {
+ /* Update the free slots in HW queue */
+ req_mgr_h->q_free_slots -= total_seq_len;
}
- /* Update the free slots in HW queue */
- req_mgr_h->q_free_slots -= total_seq_len;

spin_unlock_bh(&req_mgr_h->hw_lock);

@@ -460,8 +465,13 @@ static void proc_completions(struct ssi_drvdata *drvdata)

/* Dequeue request */
if (unlikely(request_mgr_handle->req_queue_head == request_mgr_handle->req_queue_tail)) {
- SSI_LOG_ERR("Request queue is empty req_queue_head==req_queue_tail==%u\n", request_mgr_handle->req_queue_head);
- BUG();
+ /* We are supposed to handle a completion but our
+ * queue is empty. This is not normal. Return and
+ * hope for the best.
+ */
+ SSI_LOG_ERR("Request queue is empty head == tail %u\n",
+ request_mgr_handle->req_queue_head);
+ break;
}

ssi_req = &request_mgr_handle->req_queue[request_mgr_handle->req_queue_tail];
--
2.1.4
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