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Date: Mon, 14 May 2018 13:32:22 +1200 From: Hamish Martin <hamish.martin@...iedtelesis.co.nz> To: gregkh@...uxfoundation.org Cc: linux-kernel@...r.kernel.org, Hamish Martin <hamish.martin@...iedtelesis.co.nz> Subject: [PATCH v2 1/2] uio: Reduce return paths from uio_write() Drive all return paths for uio_write() through a single block at the end of the function. Signed-off-by: Hamish Martin <hamish.martin@...iedtelesis.co.nz> Reviewed-by: Chris Packham <chris.packham@...iedtelesis.co.nz> --- v2: no changes drivers/uio/uio.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index fd4848392e0d..dd44df17004d 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -568,20 +568,29 @@ static ssize_t uio_write(struct file *filep, const char __user *buf, ssize_t retval; s32 irq_on; - if (!idev->info->irq) - return -EIO; + if (!idev->info->irq) { + retval = -EIO; + goto out; + } - if (count != sizeof(s32)) - return -EINVAL; + if (count != sizeof(s32)) { + retval = -EINVAL; + goto out; + } - if (!idev->info->irqcontrol) - return -ENOSYS; + if (!idev->info->irqcontrol) { + retval = -ENOSYS; + goto out; + } - if (copy_from_user(&irq_on, buf, count)) - return -EFAULT; + if (copy_from_user(&irq_on, buf, count)) { + retval = -EFAULT; + goto out; + } retval = idev->info->irqcontrol(idev->info, irq_on); +out: return retval ? retval : sizeof(s32); } -- 2.16.2
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