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Date: Thu, 27 Feb 2020 18:32:50 -0800
From: Joe Perches <joe@...ches.com>
To: Randy Dunlap <rdunlap@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-parport@...ts.infradead.org
Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>,
Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Subject: Re: [PATCH] parport: fix if-statement empty body warnings
On Thu, 2020-02-27 at 18:08 -0800, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@...radead.org>
>
> When debugging via DPRINTK() is not enabled, make the DPRINTK()
> macro be an empty do-while block.
>
> This fixes gcc warnings when -Wextra is set:
>
> ../drivers/parport/ieee1284.c:262:18: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
> ../drivers/parport/ieee1284.c:285:17: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
> ../drivers/parport/ieee1284.c:298:17: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
> ../drivers/parport/ieee1284_ops.c:576:18: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
>
> I have verified that there is no object code change (with gcc 7.5.0).
>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>
> Cc: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
> Cc: linux-parport@...ts.infradead.org
> ---
> drivers/parport/ieee1284.c | 2 +-
> drivers/parport/ieee1284_ops.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> --- linux-next-20200225.orig/drivers/parport/ieee1284.c
> +++ linux-next-20200225/drivers/parport/ieee1284.c
> @@ -34,7 +34,7 @@
> #ifdef DEBUG
> #define DPRINTK(stuff...) printk (stuff)
> #else
> -#define DPRINTK(stuff...)
> +#define DPRINTK(stuff...) do {} while (0)
It's frequently better to use noprintk
And perhaps this should just become
#define DPRINTK pr_debug
or perhaps a conversion of DPRINTK uses
---
drivers/parport/ieee1284_ops.c | 67 +++++++++++++++---------------------------
1 file changed, 23 insertions(+), 44 deletions(-)
diff --git a/drivers/parport/ieee1284_ops.c b/drivers/parport/ieee1284_ops.c
index 5d41dd..b1c9f51 100644
--- a/drivers/parport/ieee1284_ops.c
+++ b/drivers/parport/ieee1284_ops.c
@@ -27,12 +27,6 @@
#undef DEBUG /* Don't want a garbled console */
#endif
-#ifdef DEBUG
-#define DPRINTK(stuff...) printk (stuff)
-#else
-#define DPRINTK(stuff...)
-#endif
-
/*** *
* One-way data transfer functions. *
* ***/
@@ -115,7 +109,7 @@ size_t parport_ieee1284_write_compat (struct parport *port,
if (signal_pending (current))
break;
- DPRINTK (KERN_DEBUG "%s: Timed out\n", port->name);
+ pr_debug("%s: Timed out\n", port->name);
break;
ready:
@@ -178,9 +172,8 @@ size_t parport_ieee1284_read_nibble (struct parport *port,
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK, 0)) {
/* Timeout -- no more data? */
- DPRINTK (KERN_DEBUG
- "%s: Nibble timeout at event 9 (%d bytes)\n",
- port->name, i/2);
+ pr_debug("%s: Nibble timeout at event 9 (%d bytes)\n",
+ port->name, i / 2);
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
break;
}
@@ -201,8 +194,7 @@ size_t parport_ieee1284_read_nibble (struct parport *port,
PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* Timeout -- no more data? */
- DPRINTK (KERN_DEBUG
- "%s: Nibble timeout at event 11\n",
+ pr_debug("%s: Nibble timeout at event 11\n",
port->name);
break;
}
@@ -219,9 +211,8 @@ size_t parport_ieee1284_read_nibble (struct parport *port,
/* Read the last nibble without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
- DPRINTK (KERN_DEBUG
- "%s: No more nibble data (%d bytes)\n",
- port->name, i/2);
+ pr_debug("%s: No more nibble data (%d bytes)\n",
+ port->name, i / 2);
/* Go to reverse idle phase. */
parport_frob_control (port,
@@ -272,8 +263,7 @@ size_t parport_ieee1284_read_byte (struct parport *port,
/* Timeout -- no more data? */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
0);
- DPRINTK (KERN_DEBUG "%s: Byte timeout at event 9\n",
- port->name);
+ pr_debug("%s: Byte timeout at event 9\n", port->name);
break;
}
@@ -288,8 +278,7 @@ size_t parport_ieee1284_read_byte (struct parport *port,
PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* Timeout -- no more data? */
- DPRINTK (KERN_DEBUG "%s: Byte timeout at event 11\n",
- port->name);
+ pr_debug("%s: Byte timeout at event 11\n", port->name);
break;
}
@@ -307,8 +296,7 @@ size_t parport_ieee1284_read_byte (struct parport *port,
/* Read the last byte without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
- DPRINTK (KERN_DEBUG
- "%s: No more byte data (%zd bytes)\n",
+ pr_debug("%s: No more byte data (%zd bytes)\n",
port->name, count);
/* Go to reverse idle phase. */
@@ -353,12 +341,10 @@ int ecp_forward_to_reverse (struct parport *port)
PARPORT_STATUS_PAPEROUT, 0);
if (!retval) {
- DPRINTK (KERN_DEBUG "%s: ECP direction: reverse\n",
- port->name);
+ pr_debug("%s: ECP direction: reverse\n", port->name);
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
} else {
- DPRINTK (KERN_DEBUG "%s: ECP direction: failed to reverse\n",
- port->name);
+ pr_debug("%s: ECP direction: failed to reverse\n", port->name);
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
}
@@ -384,12 +370,10 @@ int ecp_reverse_to_forward (struct parport *port)
if (!retval) {
parport_data_forward (port);
- DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n",
- port->name);
+ pr_debug("%s: ECP direction: forward\n", port->name);
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
} else {
- DPRINTK (KERN_DEBUG
- "%s: ECP direction: failed to switch forward\n",
+ pr_debug("%s: ECP direction: failed to switch forward\n",
port->name);
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
}
@@ -450,7 +434,7 @@ size_t parport_ieee1284_ecp_write_data (struct parport *port,
}
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
- DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
+ pr_debug("%s: ECP transfer stalled!\n", port->name);
parport_frob_control (port, PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
@@ -466,8 +450,7 @@ size_t parport_ieee1284_ecp_write_data (struct parport *port,
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
break;
- DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
- port->name);
+ pr_debug("%s: Host transfer recovered\n", port->name);
if (time_after_eq (jiffies, expire)) break;
goto try_again;
@@ -565,23 +548,20 @@ size_t parport_ieee1284_ecp_read_data (struct parport *port,
command or a normal data byte, don't accept it. */
if (command) {
if (byte & 0x80) {
- DPRINTK (KERN_DEBUG "%s: stopping short at "
- "channel command (%02x)\n",
+ pr_debug("%s: stopping short at channel command (%02x)\n",
port->name, byte);
goto out;
}
else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE)
- DPRINTK (KERN_DEBUG "%s: device illegally "
- "using RLE; accepting anyway\n",
+ pr_debug("%s: device illegally using RLE; accepting anyway\n",
port->name);
rle_count = byte + 1;
/* Are we allowed to read that many bytes? */
if (rle_count > (len - count)) {
- DPRINTK (KERN_DEBUG "%s: leaving %d RLE bytes "
- "for next time\n", port->name,
- rle_count);
+ pr_debug("%s: leaving %d RLE bytes for next time\n",
+ port->name, rle_count);
break;
}
@@ -596,7 +576,7 @@ size_t parport_ieee1284_ecp_read_data (struct parport *port,
PARPORT_STATUS_ACK)) {
/* It's gone wrong. Return what data we have
to the caller. */
- DPRINTK (KERN_DEBUG "ECP read timed out at 45\n");
+ pr_debug("ECP read timed out at 45\n");
if (command)
printk (KERN_WARNING
@@ -620,7 +600,7 @@ size_t parport_ieee1284_ecp_read_data (struct parport *port,
memset (buf, byte, rle_count);
buf += rle_count;
count += rle_count;
- DPRINTK (KERN_DEBUG "%s: decompressed to %d bytes\n",
+ pr_debug("%s: decompressed to %d bytes\n",
port->name, rle_count);
} else {
/* Normal data byte. */
@@ -686,7 +666,7 @@ size_t parport_ieee1284_ecp_write_addr (struct parport *port,
}
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
- DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
+ pr_debug("%s: ECP transfer stalled!\n", port->name);
parport_frob_control (port, PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
@@ -702,8 +682,7 @@ size_t parport_ieee1284_ecp_write_addr (struct parport *port,
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
break;
- DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
- port->name);
+ pr_debug("%s: Host transfer recovered\n", port->name);
if (time_after_eq (jiffies, expire)) break;
goto try_again;
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