| Message ID | 20240502210038.11480-3-wsa+renesas@sang-engineering.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | fpga: use 'time_left' instead of 'timeout' with wait_for_*() functions | expand |
On 5/2/24 23:00, Wolfram Sang wrote: > There is a confusing pattern in the kernel to use a variable named 'timeout' to > store the result of wait_for_completion_timeout() causing patterns like: > > timeout = wait_for_completion_timeout(...) > if (!timeout) return -ETIMEDOUT; > > with all kinds of permutations. Use 'time_left' as a variable to make the code > self explaining. > > Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> > --- > drivers/fpga/zynq-fpga.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c > index 0ac93183d201..4db3d80e10b0 100644 > --- a/drivers/fpga/zynq-fpga.c > +++ b/drivers/fpga/zynq-fpga.c > @@ -387,7 +387,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) > const char *why; > int err; > u32 intr_status; > - unsigned long timeout; > + unsigned long time_left; > unsigned long flags; > struct scatterlist *sg; > int i; > @@ -427,8 +427,8 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) > zynq_step_dma(priv); > spin_unlock_irqrestore(&priv->dma_lock, flags); > > - timeout = wait_for_completion_timeout(&priv->dma_done, > - msecs_to_jiffies(DMA_TIMEOUT_MS)); > + time_left = wait_for_completion_timeout(&priv->dma_done, > + msecs_to_jiffies(DMA_TIMEOUT_MS)); > > spin_lock_irqsave(&priv->dma_lock, flags); > zynq_fpga_set_irq(priv, 0); > @@ -452,7 +452,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) > > if (priv->cur_sg || > !((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) { > - if (timeout == 0) > + if (time_left == 0) > why = "DMA timed out"; > else > why = "DMA did not complete"; Acked-by: Michal Simek <michal.simek@amd.com> Thanks, Michal
diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c index 0ac93183d201..4db3d80e10b0 100644 --- a/drivers/fpga/zynq-fpga.c +++ b/drivers/fpga/zynq-fpga.c @@ -387,7 +387,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) const char *why; int err; u32 intr_status; - unsigned long timeout; + unsigned long time_left; unsigned long flags; struct scatterlist *sg; int i; @@ -427,8 +427,8 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) zynq_step_dma(priv); spin_unlock_irqrestore(&priv->dma_lock, flags); - timeout = wait_for_completion_timeout(&priv->dma_done, - msecs_to_jiffies(DMA_TIMEOUT_MS)); + time_left = wait_for_completion_timeout(&priv->dma_done, + msecs_to_jiffies(DMA_TIMEOUT_MS)); spin_lock_irqsave(&priv->dma_lock, flags); zynq_fpga_set_irq(priv, 0); @@ -452,7 +452,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) if (priv->cur_sg || !((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) { - if (timeout == 0) + if (time_left == 0) why = "DMA timed out"; else why = "DMA did not complete";
There is a confusing pattern in the kernel to use a variable named 'timeout' to store the result of wait_for_completion_timeout() causing patterns like: timeout = wait_for_completion_timeout(...) if (!timeout) return -ETIMEDOUT; with all kinds of permutations. Use 'time_left' as a variable to make the code self explaining. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> --- drivers/fpga/zynq-fpga.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)