From: Mike Dunn Date: Thu, 10 Oct 2013 17:25:27 +0000 (-0700) Subject: mtd: docg4: fix status polling loop X-Git-Tag: MMI-PSA29.97-13-9~13292^2~48 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9fee840c03d944ed1564c127375a702e242d9555;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git mtd: docg4: fix status polling loop The loop that polls the status register waiting for an operation to complete foolishly bases the timeout simply on the number of loop iterations that have ocurred. When I increased the processor clock speed, timeouts started to appear for long block erasure operations. This patch measures the timeout using jiffies. Signed-off-by: Mike Dunn Signed-off-by: Brian Norris --- diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c index 7c38b8ad4404..bd1cb672034f 100644 --- a/drivers/mtd/nand/docg4.c +++ b/drivers/mtd/nand/docg4.c @@ -44,6 +44,7 @@ #include #include #include +#include /* * In "reliable mode" consecutive 2k pages are used in parallel (in some @@ -269,7 +270,7 @@ static int poll_status(struct docg4_priv *doc) */ uint16_t flash_status; - unsigned int timeo; + unsigned long timeo; void __iomem *docptr = doc->virtadr; dev_dbg(doc->dev, "%s...\n", __func__); @@ -277,22 +278,18 @@ static int poll_status(struct docg4_priv *doc) /* hardware quirk requires reading twice initially */ flash_status = readw(docptr + DOC_FLASHCONTROL); - timeo = 1000; + timeo = jiffies + msecs_to_jiffies(200); /* generous timeout */ do { cpu_relax(); flash_status = readb(docptr + DOC_FLASHCONTROL); - } while (!(flash_status & DOC_CTRL_FLASHREADY) && --timeo); + } while (!(flash_status & DOC_CTRL_FLASHREADY) && + time_before(jiffies, timeo)); - - if (!timeo) { + if (unlikely(!(flash_status & DOC_CTRL_FLASHREADY))) { dev_err(doc->dev, "%s: timed out!\n", __func__); return NAND_STATUS_FAIL; } - if (unlikely(timeo < 50)) - dev_warn(doc->dev, "%s: nearly timed out; %d remaining\n", - __func__, timeo); - return 0; }