From 2c99b8bfb22342ab0c06e07ee54fa0d5e638e52a Mon Sep 17 00:00:00 2001 From: Vipin Kumar Date: Mon, 2 Jul 2012 11:28:47 +0530 Subject: [PATCH] mtd: spear_smi: handle return value of timeouts properly Handle timouts in general and return value of 'wait_event_interruptible_timeout' in particular, to capture all conditions. 'wait_event_interruptible_timeout' returns either of the following three values :- * 0 - time out occurred. * negative * -ERESTARTSYS - return because of a signal * other - for a real error * positive - time remaining Fix particularly 'ERESTARTSYS' condition which is not properly handled by the smi driver at a couple of places leading to an erroneous situation. Signed-off-by: Antonio BORNEO Signed-off-by: Shiraz Hashim Signed-off-by: Vipin Kumar Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/devices/spear_smi.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/mtd/devices/spear_smi.c b/drivers/mtd/devices/spear_smi.c index aec941e74e67..b85f183d24c0 100644 --- a/drivers/mtd/devices/spear_smi.c +++ b/drivers/mtd/devices/spear_smi.c @@ -241,8 +241,8 @@ static int spear_smi_read_sr(struct spear_smi *dev, u32 bank) /* copy dev->status (lower 16 bits) in order to release lock */ if (ret > 0) ret = dev->status & 0xffff; - else - ret = -EIO; + else if (ret == 0) + ret = -ETIMEDOUT; /* restore the ctrl regs state */ writel(ctrlreg1, dev->io_base + SMI_CR1); @@ -270,16 +270,19 @@ static int spear_smi_wait_till_ready(struct spear_smi *dev, u32 bank, finish = jiffies + timeout; do { status = spear_smi_read_sr(dev, bank); - if (status < 0) - continue; /* try till timeout */ - else if (!(status & SR_WIP)) + if (status < 0) { + if (status == -ETIMEDOUT) + continue; /* try till finish */ + return status; + } else if (!(status & SR_WIP)) { return 0; + } cond_resched(); } while (!time_after_eq(jiffies, finish)); dev_err(&dev->pdev->dev, "smi controller is busy, timeout\n"); - return status; + return -EBUSY; } /** @@ -395,11 +398,11 @@ static int spear_smi_write_enable(struct spear_smi *dev, u32 bank) writel(ctrlreg1, dev->io_base + SMI_CR1); writel(0, dev->io_base + SMI_CR2); - if (ret <= 0) { + if (ret == 0) { ret = -EIO; dev_err(&dev->pdev->dev, "smi controller failed on write enable\n"); - } else { + } else if (ret > 0) { /* check whether write mode status is set for required bank */ if (dev->status & (1 << (bank + WM_SHIFT))) ret = 0; @@ -466,10 +469,10 @@ static int spear_smi_erase_sector(struct spear_smi *dev, ret = wait_event_interruptible_timeout(dev->cmd_complete, dev->status & TFF, SMI_CMD_TIMEOUT); - if (ret <= 0) { + if (ret == 0) { ret = -EIO; dev_err(&dev->pdev->dev, "sector erase failed\n"); - } else + } else if (ret > 0) ret = 0; /* success */ /* restore ctrl regs */