[PATCH 0/2] mtd: use 'time_left' instead of 'timeout' with wait_*() functions

[PATCH 0/2] mtd: use 'time_left' instead of 'timeout' with wait_*() functions

[Wolfram Sang]

There is a confusing pattern in the kernel to use a variable named 'timeout' to
store the result of wait_*() functions 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
obvious and self explaining.

This is part of a tree-wide series. The rest of the patches can be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/time_left

Because these patches are generated, I audit them before sending. This is why I
will send series step by step. Build bot is happy with these patches, though.
No functional changes intended.

Wolfram Sang (2):
  mtd: nand: mxc_nand: use 'time_left' variable with
    wait_for_completion_timeout()
  mtd: rawnand: intel: use 'time_left' variable with
    wait_for_completion_timeout()

 drivers/mtd/nand/raw/intel-nand-controller.c | 6 +++---
 drivers/mtd/nand/raw/mxc_nand.c              | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

-- 
2.43.0


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[PATCH 1/2] mtd: nand: mxc_nand: use 'time_left' variable with wait_for_completion_timeout()

[Wolfram Sang]

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/mtd/nand/raw/mxc_nand.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/mxc_nand.c b/drivers/mtd/nand/raw/mxc_nand.c
index 9d50f41b3d5a..e22fbea970d1 100644
--- a/drivers/mtd/nand/raw/mxc_nand.c
+++ b/drivers/mtd/nand/raw/mxc_nand.c
@@ -457,14 +457,14 @@ static int wait_op_done(struct mxc_nand_host *host, int useirq)
 		return 0;
 
 	if (useirq) {
-		unsigned long timeout;
+		unsigned long time_left;
 
 		reinit_completion(&host->op_completion);
 
 		irq_control(host, 1);
 
-		timeout = wait_for_completion_timeout(&host->op_completion, HZ);
-		if (!timeout && !host->devtype_data->check_int(host)) {
+		time_left = wait_for_completion_timeout(&host->op_completion, HZ);
+		if (!time_left && !host->devtype_data->check_int(host)) {
 			dev_dbg(host->dev, "timeout waiting for irq\n");
 			ret = -ETIMEDOUT;
 		}
-- 
2.43.0


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Re: [PATCH 1/2] mtd: nand: mxc_nand: use 'time_left' variable with wait_for_completion_timeout()

[Miquel Raynal]

On Tue, 2024-06-04 at 21:29:20 UTC, 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>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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[PATCH 2/2] mtd: rawnand: intel: use 'time_left' variable with wait_for_completion_timeout()

[Wolfram Sang]

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.

Fix to the proper variable type 'unsigned long' while here.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/mtd/nand/raw/intel-nand-controller.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/intel-nand-controller.c b/drivers/mtd/nand/raw/intel-nand-controller.c
index f0ad2308f6d5..78174c463b36 100644
--- a/drivers/mtd/nand/raw/intel-nand-controller.c
+++ b/drivers/mtd/nand/raw/intel-nand-controller.c
@@ -295,7 +295,7 @@ static int ebu_dma_start(struct ebu_nand_controller *ebu_host, u32 dir,
 	unsigned long flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 	dma_addr_t buf_dma;
 	int ret;
-	u32 timeout;
+	unsigned long time_left;
 
 	if (dir == DMA_DEV_TO_MEM) {
 		chan = ebu_host->dma_rx;
@@ -335,8 +335,8 @@ static int ebu_dma_start(struct ebu_nand_controller *ebu_host, u32 dir,
 	dma_async_issue_pending(chan);
 
 	/* Wait DMA to finish the data transfer.*/
-	timeout = wait_for_completion_timeout(dma_completion, msecs_to_jiffies(1000));
-	if (!timeout) {
+	time_left = wait_for_completion_timeout(dma_completion, msecs_to_jiffies(1000));
+	if (!time_left) {
 		dev_err(ebu_host->dev, "I/O Error in DMA RX (status %d)\n",
 			dmaengine_tx_status(chan, cookie, NULL));
 		dmaengine_terminate_sync(chan);
-- 
2.43.0


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Re: [PATCH 2/2] mtd: rawnand: intel: use 'time_left' variable with wait_for_completion_timeout()

[Miquel Raynal]

On Tue, 2024-06-04 at 21:29:21 UTC, 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.
> 
> Fix to the proper variable type 'unsigned long' while here.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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Re: [PATCH 0/2] mtd: use 'time_left' instead of 'timeout' with wait_*() functions

[Miquel Raynal]

Hi Wolfram,

wsa+renesas@sang-engineering.com wrote on Tue,  4 Jun 2024 23:29:19
+0200:

> There is a confusing pattern in the kernel to use a variable named 'timeout' to
> store the result of wait_*() functions 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
> obvious and self explaining.

Good idea. The waiting functions are generally confusing because the
semantics of the return values are different, so this is a good first
step, I'll take them through mtd-next soon.

Thanks,
Miquèl

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