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Date: Sun, 3 Sep 2017 11:56:50 +0300
From: Gilad Ben-Yossef <gilad@...yossef.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-crypto@...r.kernel.org,
driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org
Cc: Ofir Drang <ofir.drang@....com>
Subject: [PATCH 8/8] staging: ccree: remove BUG macro usage
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@...yossef.com>
---
drivers/staging/ccree/ssi_buffer_mgr.c | 14 ++++++--------
drivers/staging/ccree/ssi_cipher.c | 1 -
drivers/staging/ccree/ssi_pm.c | 3 ++-
drivers/staging/ccree/ssi_request_mgr.c | 23 +++++++++++++++++------
4 files changed, 25 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/ccree/ssi_buffer_mgr.c b/drivers/staging/ccree/ssi_buffer_mgr.c
index 6393609..d744820 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 +849,8 @@ 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();
+ rc = -EINVAL;
+ goto chain_assoc_exit;
}
sg_index += current_sg->length;
mapped_nents++;
@@ -1154,7 +1150,8 @@ 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;
+ goto chain_data_exit;
}
sg_index += areq_ctx->src_sgl->length;
src_mapped_nents--;
@@ -1198,7 +1195,8 @@ 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();
+ rc = -EINVAL;
+ goto chain_data_exit;
}
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 4311746..68c9fc0 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..6914dc6 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);
+ goto out;
}
ssi_req = &request_mgr_handle->req_queue[request_mgr_handle->req_queue_tail];
@@ -487,6 +497,7 @@ static void proc_completions(struct ssi_drvdata *drvdata)
request_mgr_handle->req_queue_tail = (request_mgr_handle->req_queue_tail + 1) & (MAX_REQUEST_QUEUE_SIZE - 1);
SSI_LOG_DEBUG("Dequeue request tail=%u\n", request_mgr_handle->req_queue_tail);
SSI_LOG_DEBUG("Request completed. axi_completed=%d\n", request_mgr_handle->axi_completed);
+out:
#if defined(CONFIG_PM_RUNTIME) || defined(CONFIG_PM_SLEEP)
rc = ssi_power_mgr_runtime_put_suspend(&plat_dev->dev);
if (rc != 0)
--
2.1.4
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