linux-kernel - [PATCH v2] mtd: rawnand: Increment IFC_TIMEOUT

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Date:   Tue, 14 Nov 2023 01:53:51 +1000
From:   Ronald Monthero <debug.penguin32@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     richard@....at, vigneshr@...com, heiko@...ech.de,
        martin.blumenstingl@...glemail.com, paul@...pouillou.net,
        robh@...nel.org, u.kleine-koenig@...gutronix.de,
        debug.penguin32@...il.com, AVKrasnov@...rdevices.ru,
        r.czerwinski@...gutronix.de, andriy.shevchenko@...ux.intel.com,
        jaimeliao.tw@...il.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v2] mtd: rawnand: Increment IFC_TIMEOUT_MSECS for nand controller response

Under heavy load it is likely that the controller is done
with its own task but the thread unlocking the wait is not
scheduled in time. Increasing IFC_TIMEOUT_MSECS allows the
controller to respond within allowable timeslice of 1 sec

fsl,ifc-nand 7e800000.nand: Controller is not responding
main/smp_fsm.c:1884 <inrcu: rcu_preempt detected stalls on CPUs/tasks:
rcu:    Tasks blocked on level-0 rcu_node (CPUs 0-1): P116/2:b..l
        (detected by 1, t=2102 jiffies, g=7729, q=754)
task:irq/31-arm-irq1 state:D stack: 0 pid: 116 ppid: 2 flags:0x00000000
[<8064b97f>] (__schedule) from [<8064bb01>] (schedule+0x8d/0xc2)
[<8064bb01>] (schedule) from [<8064dacd>]
[<8064dacd>] (rt_mutex_slowlock_block.constprop.0) from [<8064db57>]
[<8064db57>] (__rt_mutex_slowlock.constprop.0) from [<8064dbf7>]
[<8064dbf7>] (rt_mutex_slowlock.constprop.0) from [<804b2047>]
[<804b2047>] (nand_get_device) from [<804b5335>] (nand_write_oob+0x1b/0x4a)
[<804b5335>] (nand_write_oob) from [<804a3585>] (mtd_write+0x41/0x5c)
[<804a3585>] (mtd_write) from [<804c1d47>] (ubi_io_write+0x17f/0x22c)
[<804c1d47>] (ubi_io_write) from [<804c047b>] (ubi_eba_write_leb+0x5b/0x1d0)

Signed-off-by: Ronald Monthero <debug.penguin32@...il.com>
---
 drivers/mtd/nand/raw/fsl_ifc_nand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/fsl_ifc_nand.c b/drivers/mtd/nand/raw/fsl_ifc_nand.c
index 20bb1e0cb5eb..42f8ea46b6a8 100644
--- a/drivers/mtd/nand/raw/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/raw/fsl_ifc_nand.c
@@ -21,7 +21,7 @@
 
 #define ERR_BYTE		0xFF /* Value returned for read
 					bytes when read failed	*/
-#define IFC_TIMEOUT_MSECS	500  /* Maximum number of mSecs to wait
+#define IFC_TIMEOUT_MSECS	1000  /* Maximum number of mSecs to wait
 					for IFC NAND Machine	*/
 
 struct fsl_ifc_ctrl;
-- 
2.34.1