korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-16 16:54:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

mmc: sh_mmcif: fix late delayed work initialisation

Browse Source 
If the driver is loaded with a card in the slot, mmc_add_host() will
schedule an immediate card-detection work, which will start IO and wait
for command completion. Usually the kernel first returns to the sh_mmcif
probe function, lets it finish and only then schedules the rescan work.
But sometimes, expecially under heavy system load, the work will be
scheduled immediately before returning to the probe method. In this case
it is important for the driver to be fully prepared for IO. For sh_mmcif
this means, that also the timeout work has to be initialised before
calling mmc_add_host(). It is also better to prepare interrupts
beforehand. Besides, since mmc_add_host() does card-detection itself,
there is no need to do it again immediately afterwards.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2012-01-21 00:41:28 +01:00 committed by Chris Ball
parent e3de2be736
commit 5ba85d95ca
1 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/mmc/host/sh_mmcif.c
View File

@ -1327,7 +1327,7 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev)
if (ret < 0)
goto clean_up2;
mmc_add_host(mmc);
INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
@ -1338,22 +1338,24 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev)
}
ret = request_threaded_irq(irq[1], sh_mmcif_intr, sh_mmcif_irqt, 0, "sh_mmc:int", host);
if (ret) {
free_irq(irq[0], host);
dev_err(&pdev->dev, "request_irq error (sh_mmc:int)\n");
goto clean_up3;
goto clean_up4;
}
INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
mmc_detect_change(host->mmc, 0);
ret = mmc_add_host(mmc);
if (ret < 0)
goto clean_up5;
dev_info(&pdev->dev, "driver version %s\n", DRIVER_VERSION);
dev_dbg(&pdev->dev, "chip ver H'%04x\n",
sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0x0000ffff);
return ret;
clean_up5:
free_irq(irq[1], host);
clean_up4:
free_irq(irq[0], host);
clean_up3:
mmc_remove_host(mmc);
pm_runtime_suspend(&pdev->dev);
clean_up2:
pm_runtime_disable(&pdev->dev);