linux-kernel - [PATCH 08/18] staging: gasket: gasket_wait_with

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Message-Id: <20180714055816.223754-9-toddpoynor@gmail.com>
Date:   Fri, 13 Jul 2018 22:58:06 -0700
From:   Todd Poynor <toddpoynor@...il.com>
To:     Rob Springer <rspringer@...gle.com>,
        John Joseph <jnjoseph@...gle.com>,
        Ben Chan <benchan@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Zhongze Hu <frankhu@...omium.org>, Simon Que <sque@...omium.org>,
        Dmitry Torokhov <dtor@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Todd Poynor <toddpoynor@...gle.com>
Subject: [PATCH 08/18] staging: gasket: gasket_wait_with_reschedule fixups

From: Todd Poynor <toddpoynor@...gle.com>

Return -ETIMEDOUT on timeouts.

Don't need 64-bit sized retry count.

Use msleep().

Return immediately when condition hit.

Reported-by: Dmitry Torokhov <dtor@...omium.org>
Signed-off-by: Zhongze Hu <frankhu@...omium.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/apex_driver.c |  8 ++++----
 drivers/staging/gasket/gasket_core.c | 11 ++++++-----
 drivers/staging/gasket/gasket_core.h |  2 +-
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/gasket/apex_driver.c b/drivers/staging/gasket/apex_driver.c
index f2d082c06c98..b1318482ba65 100644
--- a/drivers/staging/gasket/apex_driver.c
+++ b/drivers/staging/gasket/apex_driver.c
@@ -502,7 +502,7 @@ static int apex_enter_reset(struct gasket_dev *gasket_dev, uint type)
 		gasket_log_error(gasket_dev,
 				 "DMAs did not quiesce within timeout (%d ms)",
 				 APEX_RESET_RETRY * APEX_RESET_DELAY);
-		return -EINVAL;
+		return -ETIMEDOUT;
 	}
 
 	/*  - Enable GCB reset (0x1 to rg_rst_gcb) */
@@ -525,7 +525,7 @@ static int apex_enter_reset(struct gasket_dev *gasket_dev, uint type)
 			gasket_dev,
 			"RAM did not shut down within timeout (%d ms)",
 			APEX_RESET_RETRY * APEX_RESET_DELAY);
-		return -EINVAL;
+		return -ETIMEDOUT;
 	}
 
 	return 0;
@@ -576,7 +576,7 @@ static int apex_quit_reset(struct gasket_dev *gasket_dev, uint type)
 			gasket_dev,
 			"RAM did not enable within timeout (%d ms)",
 			APEX_RESET_RETRY * APEX_RESET_DELAY);
-		return -EINVAL;
+		return -ETIMEDOUT;
 	}
 
 	/*    - Wait for Reset complete. */
@@ -588,7 +588,7 @@ static int apex_quit_reset(struct gasket_dev *gasket_dev, uint type)
 			gasket_dev,
 			"GCB did not leave reset within timeout (%d ms)",
 			APEX_RESET_RETRY * APEX_RESET_DELAY);
-		return -EINVAL;
+		return -ETIMEDOUT;
 	}
 
 	if (!allow_hw_clock_gating) {
diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 155c69446f0b..6316e6c800ba 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -21,6 +21,7 @@
 #include "gasket_page_table.h"
 #include "gasket_sysfs.h"
 
+#include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/of.h>
@@ -2135,16 +2136,16 @@ EXPORT_SYMBOL(gasket_wait_sync);
  **/
 int gasket_wait_with_reschedule(
 	struct gasket_dev *gasket_dev, int bar, u64 offset, u64 mask, u64 val,
-	u64 max_retries, u64 delay_ms)
+	uint max_retries, u64 delay_ms)
 {
-	u64 retries = 0;
+	uint retries = 0;
 	u64 tmp;
 
 	while (retries < max_retries) {
 		tmp = gasket_dev_read_64(gasket_dev, bar, offset);
 		if ((tmp & mask) == val)
-			break;
-		schedule_timeout(msecs_to_jiffies(delay_ms));
+			return 0;
+		msleep(delay_ms);
 		retries++;
 	}
 	if (retries == max_retries) {
@@ -2152,7 +2153,7 @@ int gasket_wait_with_reschedule(
 			gasket_dev,
 			"gasket_wait_with_reschedule timeout: reg %llx timeout (%llu ms)",
 			offset, max_retries * delay_ms);
-		return -EINVAL;
+		return -ETIMEDOUT;
 	}
 	return 0;
 }
diff --git a/drivers/staging/gasket/gasket_core.h b/drivers/staging/gasket/gasket_core.h
index 77d08c1265ca..16bee478dce6 100644
--- a/drivers/staging/gasket/gasket_core.h
+++ b/drivers/staging/gasket/gasket_core.h
@@ -714,6 +714,6 @@ int gasket_wait_sync(
 /* Helper function, Asynchronous waits on a given set of bits. */
 int gasket_wait_with_reschedule(
 	struct gasket_dev *gasket_dev, int bar, u64 offset, u64 mask, u64 val,
-	u64 max_retries, u64 delay_ms);
+	uint max_retries, u64 delay_ms);
 
 #endif /* __GASKET_CORE_H__ */
-- 
2.18.0.203.gfac676dfb9-goog