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[PATCH 0/8] staging: ccree: more cleanup work for 4.14

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  [PATCH 0/8] staging: ccree: more cleanup work for 4.14 Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-03 11:00 +0200
    [PATCH 7/8] staging: ccree: replace noop macro with inline Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-03 11:00 +0200
      Re: [PATCH 7/8] staging: ccree: replace noop macro with inline Dan Carpenter <dan.carpenter@oracle.com> - 2017-09-09 11:20 +0200
    [PATCH 1/8] staging: ccree: Replace kzalloc with devm_kzalloc Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-03 11:00 +0200
    [PATCH 3/8] staging: ccree: Use platform_get_irq and devm_request_irq Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-03 11:00 +0200
    [PATCH 2/8] staging: ccree: Convert to devm_ioremap_resource for map, unmap Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-03 11:00 +0200
    [PATCH 8/8] staging: ccree: remove BUG macro usage Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-03 11:00 +0200
      Re: [PATCH 8/8] staging: ccree: remove BUG macro usage Dan Carpenter <dan.carpenter@oracle.com> - 2017-09-06 21:30 +0200
        Re: [PATCH 8/8] staging: ccree: remove BUG macro usage Gilad Ben-Yossef <gilad@benyossef.com> - 2017-09-07 11:10 +0200

#1725631 — [PATCH 0/8] staging: ccree: more cleanup work for 4.14

More cleanup work from Sunil and myself.

I've previously sent some of these as part of a larger patch set.
I've decided to split the patch set to smaller chunks to make it
more manageable.

This patch set applies on top of commit 28eb51f7468a
("staging:rtl8188eu:core Fix remove unneccessary else block").

Gilad Ben-Yossef (5):
  staging: ccree: simplify resource release on error
  staging: ccree: remove unused completion
  staging: ccree: move over to BIT macro for bit defines
  staging: ccree: replace noop macro with inline
  staging: ccree: remove BUG macro usage

Suniel Mahesh (3):
  staging: ccree: Replace kzalloc with devm_kzalloc
  staging: ccree: Convert to devm_ioremap_resource for map, unmap
  staging: ccree: Use platform_get_irq and devm_request_irq

 drivers/staging/ccree/ssi_aead.c        |   3 +-
 drivers/staging/ccree/ssi_buffer_mgr.c  |  14 +--
 drivers/staging/ccree/ssi_cipher.c      |   4 +-
 drivers/staging/ccree/ssi_cipher.h      |  10 +-
 drivers/staging/ccree/ssi_driver.c      | 196 +++++++++++++-------------------
 drivers/staging/ccree/ssi_driver.h      |  15 +--
 drivers/staging/ccree/ssi_hash.c        |   3 +-
 drivers/staging/ccree/ssi_pm.c          |   3 +-
 drivers/staging/ccree/ssi_request_mgr.c |  23 +++-
 9 files changed, 119 insertions(+), 152 deletions(-)

-- 
2.1.4

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#1725633 — [PATCH 7/8] staging: ccree: replace noop macro with inline

Replace noop macro with a noop inline function

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/staging/ccree/ssi_driver.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.h b/drivers/staging/ccree/ssi_driver.h
index 06a3c48..81ba827 100644
--- a/drivers/staging/ccree/ssi_driver.h
+++ b/drivers/staging/ccree/ssi_driver.h
@@ -187,8 +187,8 @@ struct async_gen_req_ctx {
 #ifdef DX_DUMP_BYTES
 void dump_byte_array(const char *name, const u8 *the_array, unsigned long size);
 #else
-#define dump_byte_array(name, array, size) do {	\
-} while (0);
+static inline void dump_byte_array(const char *name, const u8 *the_array,
+				   unsigned long size) {};
 #endif
 
 int init_cc_regs(struct ssi_drvdata *drvdata, bool is_probe);
-- 
2.1.4

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#1729414 — Re: [PATCH 7/8] staging: ccree: replace noop macro with inline

On Sun, Sep 03, 2017 at 11:56:49AM +0300, Gilad Ben-Yossef wrote:
> Replace noop macro with a noop inline function
> 
> Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
> ---
>  drivers/staging/ccree/ssi_driver.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/ccree/ssi_driver.h b/drivers/staging/ccree/ssi_driver.h
> index 06a3c48..81ba827 100644
> --- a/drivers/staging/ccree/ssi_driver.h
> +++ b/drivers/staging/ccree/ssi_driver.h
> @@ -187,8 +187,8 @@ struct async_gen_req_ctx {
>  #ifdef DX_DUMP_BYTES
>  void dump_byte_array(const char *name, const u8 *the_array, unsigned long size);
>  #else
> -#define dump_byte_array(name, array, size) do {	\
> -} while (0);
> +static inline void dump_byte_array(const char *name, const u8 *the_array,
> +				   unsigned long size) {};

Could you put the {} on the next line?  Also there is no need for the
semi-colon after the end of a function.

This is a style thing, so if you want to do it in a follow on patch
that's fine

regards,
dan carpenter

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#1725634 — [PATCH 1/8] staging: ccree: Replace kzalloc with devm_kzalloc

From: Suniel Mahesh <sunil.m@techveda.org>

It is recommended to use managed function devm_kzalloc, which
simplifies driver cleanup paths and driver code.
This patch does the following:
(a) replace kzalloc with devm_kzalloc.
(b) drop kfree(), because memory allocated with devm_kzalloc() is
automatically freed on driver detach, otherwise it leads to a double
free.
(c) remove unnecessary blank lines.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
[gby: rebase on top of latest coding style fixes changes]
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/staging/ccree/ssi_driver.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index 9c6f120..47e0880 100644
--- a/drivers/staging/ccree/ssi_driver.c
+++ b/drivers/staging/ccree/ssi_driver.c
@@ -223,14 +223,15 @@ static int init_cc_resources(struct platform_device *plat_dev)
 	struct resource *req_mem_cc_regs = NULL;
 	void __iomem *cc_base = NULL;
 	bool irq_registered = false;
-	struct ssi_drvdata *new_drvdata = kzalloc(sizeof(*new_drvdata),
-						  GFP_KERNEL);
+	struct ssi_drvdata *new_drvdata;
 	struct device *dev = &plat_dev->dev;
 	struct device_node *np = dev->of_node;
 	u32 signature_val;
 	int rc = 0;
 
-	if (unlikely(!new_drvdata)) {
+	new_drvdata = devm_kzalloc(&plat_dev->dev, sizeof(*new_drvdata),
+				   GFP_KERNEL);
+	if (!new_drvdata) {
 		SSI_LOG_ERR("Failed to allocate drvdata");
 		rc = -ENOMEM;
 		goto init_cc_res_err;
@@ -435,10 +436,8 @@ static int init_cc_resources(struct platform_device *plat_dev)
 					   resource_size(new_drvdata->res_mem));
 			new_drvdata->res_mem = NULL;
 		}
-		kfree(new_drvdata);
 		dev_set_drvdata(&plat_dev->dev, NULL);
 	}
-
 	return rc;
 }
 
@@ -479,8 +478,6 @@ static void cleanup_cc_resources(struct platform_device *plat_dev)
 		drvdata->cc_base = NULL;
 		drvdata->res_mem = NULL;
 	}
-
-	kfree(drvdata);
 	dev_set_drvdata(&plat_dev->dev, NULL);
 }
 
-- 
2.1.4

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#1725635 — [PATCH 3/8] staging: ccree: Use platform_get_irq and devm_request_irq

From: Suniel Mahesh <sunil.m@techveda.org>

It is recommended to use managed function devm_request_irq(),
which simplifies driver cleanup paths and driver code.
This patch does the following:
(a) replace platform_get_resource(), request_irq() and corresponding
error handling with platform_get_irq() and devm_request_irq().
(b) remove struct resource pointer(res_irq) in struct ssi_drvdata as
it seems redundant.
(c) change type of member irq in struct ssi_drvdata from unsigned int
to int, as return type of platform_get_irq is int and can be used in
error handling.
(d) remove irq_registered variable from driver probe as it seems
redundant.
(e) free_irq is not required any more, devm_request_irq() free's it
on driver detach.
(f) adjust log messages accordingly and remove any blank lines.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/staging/ccree/ssi_driver.c | 30 +++++++++---------------------
 drivers/staging/ccree/ssi_driver.h |  3 +--
 2 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index cbe9a03..3e7193d 100644
--- a/drivers/staging/ccree/ssi_driver.c
+++ b/drivers/staging/ccree/ssi_driver.c
@@ -222,7 +222,6 @@ static int init_cc_resources(struct platform_device *plat_dev)
 {
 	struct resource *req_mem_cc_regs = NULL;
 	void __iomem *cc_base = NULL;
-	bool irq_registered = false;
 	struct ssi_drvdata *new_drvdata;
 	struct device *dev = &plat_dev->dev;
 	struct device_node *np = dev->of_node;
@@ -262,26 +261,22 @@ static int init_cc_resources(struct platform_device *plat_dev)
 		      &req_mem_cc_regs->start, new_drvdata->cc_base);
 	cc_base = new_drvdata->cc_base;
 	/* Then IRQ */
-	new_drvdata->res_irq = platform_get_resource(plat_dev, IORESOURCE_IRQ, 0);
-	if (unlikely(!new_drvdata->res_irq)) {
+	new_drvdata->irq = platform_get_irq(plat_dev, 0);
+	if (new_drvdata->irq < 0) {
 		SSI_LOG_ERR("Failed getting IRQ resource\n");
-		rc = -ENODEV;
+		rc = new_drvdata->irq;
 		goto init_cc_res_err;
 	}
-	rc = request_irq(new_drvdata->res_irq->start, cc_isr,
-			 IRQF_SHARED, "arm_cc7x", new_drvdata);
-	if (unlikely(rc != 0)) {
-		SSI_LOG_ERR("Could not register to interrupt %llu\n",
-			    (unsigned long long)new_drvdata->res_irq->start);
+	rc = devm_request_irq(&plat_dev->dev, new_drvdata->irq, cc_isr,
+			      IRQF_SHARED, "arm_cc7x", new_drvdata);
+	if (rc) {
+		SSI_LOG_ERR("Could not register to interrupt %d\n",
+			    new_drvdata->irq);
 		goto init_cc_res_err;
 	}
 	init_completion(&new_drvdata->icache_setup_completion);
 
-	irq_registered = true;
-	SSI_LOG_DEBUG("Registered to IRQ (%s) %llu\n",
-		      new_drvdata->res_irq->name,
-		      (unsigned long long)new_drvdata->res_irq->start);
-
+	SSI_LOG_DEBUG("Registered to IRQ: %d\n", new_drvdata->irq);
 	new_drvdata->plat_dev = plat_dev;
 
 	rc = cc_clk_on(new_drvdata);
@@ -410,10 +405,6 @@ static int init_cc_resources(struct platform_device *plat_dev)
 #ifdef ENABLE_CC_SYSFS
 		ssi_sysfs_fini();
 #endif
-		if (irq_registered) {
-			free_irq(new_drvdata->res_irq->start, new_drvdata);
-			new_drvdata->res_irq = NULL;
-		}
 		dev_set_drvdata(&plat_dev->dev, NULL);
 	}
 	return rc;
@@ -443,11 +434,8 @@ static void cleanup_cc_resources(struct platform_device *plat_dev)
 #ifdef ENABLE_CC_SYSFS
 	ssi_sysfs_fini();
 #endif
-
 	fini_cc_regs(drvdata);
 	cc_clk_off(drvdata);
-	free_irq(drvdata->res_irq->start, drvdata);
-	drvdata->res_irq = NULL;
 	dev_set_drvdata(&plat_dev->dev, NULL);
 }
 
diff --git a/drivers/staging/ccree/ssi_driver.h b/drivers/staging/ccree/ssi_driver.h
index 518c0bf..88ef370 100644
--- a/drivers/staging/ccree/ssi_driver.h
+++ b/drivers/staging/ccree/ssi_driver.h
@@ -128,9 +128,8 @@ struct ssi_crypto_req {
  * @fw_ver:	SeP loaded firmware version
  */
 struct ssi_drvdata {
-	struct resource *res_irq;
 	void __iomem *cc_base;
-	unsigned int irq;
+	int irq;
 	u32 irq_mask;
 	u32 fw_ver;
 	/* Calibration time of start/stop
-- 
2.1.4

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#1725636 — [PATCH 2/8] staging: ccree: Convert to devm_ioremap_resource for map, unmap

From: Suniel Mahesh <sunil.m@techveda.org>

It is recommended to use managed function devm_ioremap_resource(),
which simplifies driver cleanup paths and driver code.
This patch does the following:
(a) replace request_mem_region(), ioremap() and corresponding error
handling with devm_ioremap_resource().
(b) remove struct resource pointer(res_mem) in struct ssi_drvdata as it
seems redundant, use struct resource pointer which is defined locally and
adjust return value of platform_get_resource() accordingly.
(c) release_mem_region() and iounmap() are dropped, since devm_ioremap_
resource() releases and unmaps mem region on driver detach.
(d) adjust log messages accordingly and remove any blank lines.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
[gby: rebase on top of latest coding style fixes changes]
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/staging/ccree/ssi_driver.c | 60 ++++++++++----------------------------
 drivers/staging/ccree/ssi_driver.h |  1 -
 2 files changed, 15 insertions(+), 46 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index 47e0880..cbe9a03 100644
--- a/drivers/staging/ccree/ssi_driver.c
+++ b/drivers/staging/ccree/ssi_driver.c
@@ -246,35 +246,21 @@ static int init_cc_resources(struct platform_device *plat_dev)
 	dev_set_drvdata(&plat_dev->dev, new_drvdata);
 	/* Get device resources */
 	/* First CC registers space */
-	new_drvdata->res_mem = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
-	if (unlikely(!new_drvdata->res_mem)) {
-		SSI_LOG_ERR("Failed getting IO memory resource\n");
-		rc = -ENODEV;
-		goto init_cc_res_err;
-	}
-	SSI_LOG_DEBUG("Got MEM resource (%s): start=%pad end=%pad\n",
-		      new_drvdata->res_mem->name,
-		      new_drvdata->res_mem->start,
-		      new_drvdata->res_mem->end);
+	req_mem_cc_regs = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
 	/* Map registers space */
-	req_mem_cc_regs = request_mem_region(new_drvdata->res_mem->start, resource_size(new_drvdata->res_mem), "arm_cc7x_regs");
-	if (unlikely(!req_mem_cc_regs)) {
-		SSI_LOG_ERR("Couldn't allocate registers memory region at "
-			     "0x%08X\n", (unsigned int)new_drvdata->res_mem->start);
-		rc = -EBUSY;
-		goto init_cc_res_err;
-	}
-	cc_base = ioremap(new_drvdata->res_mem->start, resource_size(new_drvdata->res_mem));
-	if (unlikely(!cc_base)) {
-		SSI_LOG_ERR("ioremap[CC](0x%08X,0x%08X) failed\n",
-			    (unsigned int)new_drvdata->res_mem->start,
-			    (unsigned int)resource_size(new_drvdata->res_mem));
-		rc = -ENOMEM;
+	new_drvdata->cc_base = devm_ioremap_resource(&plat_dev->dev,
+						     req_mem_cc_regs);
+	if (IS_ERR(new_drvdata->cc_base)) {
+		rc = PTR_ERR(new_drvdata->cc_base);
 		goto init_cc_res_err;
 	}
-	SSI_LOG_DEBUG("CC registers mapped from %pa to 0x%p\n", &new_drvdata->res_mem->start, cc_base);
-	new_drvdata->cc_base = cc_base;
-
+	SSI_LOG_DEBUG("Got MEM resource (%s): start=%pad end=%pad\n",
+		      req_mem_cc_regs->name,
+		      req_mem_cc_regs->start,
+		      req_mem_cc_regs->end);
+	SSI_LOG_DEBUG("CC registers mapped from %pa to 0x%p\n",
+		      &req_mem_cc_regs->start, new_drvdata->cc_base);
+	cc_base = new_drvdata->cc_base;
 	/* Then IRQ */
 	new_drvdata->res_irq = platform_get_resource(plat_dev, IORESOURCE_IRQ, 0);
 	if (unlikely(!new_drvdata->res_irq)) {
@@ -424,17 +410,9 @@ static int init_cc_resources(struct platform_device *plat_dev)
 #ifdef ENABLE_CC_SYSFS
 		ssi_sysfs_fini();
 #endif
-
-		if (req_mem_cc_regs) {
-			if (irq_registered) {
-				free_irq(new_drvdata->res_irq->start, new_drvdata);
-				new_drvdata->res_irq = NULL;
-				iounmap(cc_base);
-				new_drvdata->cc_base = NULL;
-			}
-			release_mem_region(new_drvdata->res_mem->start,
-					   resource_size(new_drvdata->res_mem));
-			new_drvdata->res_mem = NULL;
+		if (irq_registered) {
+			free_irq(new_drvdata->res_irq->start, new_drvdata);
+			new_drvdata->res_irq = NULL;
 		}
 		dev_set_drvdata(&plat_dev->dev, NULL);
 	}
@@ -470,14 +448,6 @@ static void cleanup_cc_resources(struct platform_device *plat_dev)
 	cc_clk_off(drvdata);
 	free_irq(drvdata->res_irq->start, drvdata);
 	drvdata->res_irq = NULL;
-
-	if (drvdata->cc_base) {
-		iounmap(drvdata->cc_base);
-		release_mem_region(drvdata->res_mem->start,
-				   resource_size(drvdata->res_mem));
-		drvdata->cc_base = NULL;
-		drvdata->res_mem = NULL;
-	}
 	dev_set_drvdata(&plat_dev->dev, NULL);
 }
 
diff --git a/drivers/staging/ccree/ssi_driver.h b/drivers/staging/ccree/ssi_driver.h
index b6ad89a..518c0bf 100644
--- a/drivers/staging/ccree/ssi_driver.h
+++ b/drivers/staging/ccree/ssi_driver.h
@@ -128,7 +128,6 @@ struct ssi_crypto_req {
  * @fw_ver:	SeP loaded firmware version
  */
 struct ssi_drvdata {
-	struct resource *res_mem;
 	struct resource *res_irq;
 	void __iomem *cc_base;
 	unsigned int irq;
-- 
2.1.4

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#1725637 — [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@benyossef.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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#1727684 — Re: [PATCH 8/8] staging: ccree: remove BUG macro usage

On Sun, Sep 03, 2017 at 11:56:50AM +0300, Gilad Ben-Yossef wrote:
> @@ -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;

You've got a direct return followed by a goto.

It's a do-nothing goto that just returns rc.  I hate those.  I've tried
to review locking bugs to see if single returns prevent future
programmers from introducing new error paths which don't unlock.  They
don't really help...

regards,
dan carpenter

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#1728056 — Re: [PATCH 8/8] staging: ccree: remove BUG macro usage

On Wed, Sep 6, 2017 at 10:28 PM, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> On Sun, Sep 03, 2017 at 11:56:50AM +0300, Gilad Ben-Yossef wrote:
>> @@ -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;
>
> You've got a direct return followed by a goto.

Yes, that is silly. Thank you for spotting that.

>
> It's a do-nothing goto that just returns rc.  I hate those.  I've tried
> to review locking bugs to see if single returns prevent future
> programmers from introducing new error paths which don't unlock.  They
> don't really help...


I've replaced the error handling from goto to return as you suggested
for the changes
introduced by this patch.

Still need to clean up a lot of the other code doing this though.

Gilad




-- 
Gilad Ben-Yossef
Chief Coffee Drinker

"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
 -- Jean-Baptiste Queru

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